diff --git a/src/Constants.php b/src/Constants.php
index a0eb0c00..f50d2b51 100644
--- a/src/Constants.php
+++ b/src/Constants.php
@@ -17,11 +17,11 @@ class Constants
     /**
      * The current release version
      */
-    public const VERSION = '1.19.3';
+    public const VERSION = '1.19.4';
     /**
      * The current release: major * 10000 + minor * 100 + patch
      */
-    public const VERSION_ID = 11903;
+    public const VERSION_ID = 11904;
     /**
      * The current release status, either "stable" or "dev"
      */
diff --git a/src/Controller/AbstractController.php b/src/Controller/AbstractController.php
index 109857b8..8a05149d 100644
--- a/src/Controller/AbstractController.php
+++ b/src/Controller/AbstractController.php
@@ -18,6 +18,7 @@ use App\Timesheet\DateTimeFactory;
 use App\Utils\LocaleFormats;
 use Psr\Log\LoggerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController as BaseAbstractController;
+use Symfony\Component\Form\Extension\Core\Type\FormType;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Contracts\Service\ServiceSubscriberInterface;
@@ -39,6 +40,13 @@ abstract class AbstractController extends BaseAbstractController implements Serv
         return $this->container->get('translator');
     }
 
+    public function createFormForGetRequest(string $type = FormType::class, $data = null, array $options = []): FormInterface
+    {
+        return $this->container
+            ->get('form.factory')
+            ->createNamed('', $type, $data, $options);
+    }
+
     private function getLogger(): LoggerInterface
     {
         return $this->container->get('logger');
diff --git a/src/Controller/Reporting/CustomerMonthlyProjectsController.php b/src/Controller/Reporting/CustomerMonthlyProjectsController.php
new file mode 100644
index 00000000..f4a74f72
--- /dev/null
+++ b/src/Controller/Reporting/CustomerMonthlyProjectsController.php
@@ -0,0 +1,111 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Controller\Reporting;
+
+use App\Controller\AbstractController;
+use App\Export\Spreadsheet\Writer\BinaryFileResponseWriter;
+use App\Export\Spreadsheet\Writer\XlsxWriter;
+use App\Reporting\CustomerMonthlyProjects\CustomerMonthlyProjects;
+use App\Reporting\CustomerMonthlyProjects\CustomerMonthlyProjectsForm;
+use App\Repository\Query\UserQuery;
+use App\Repository\UserRepository;
+use App\Timesheet\TimesheetStatisticService;
+use PhpOffice\PhpSpreadsheet\Reader\Html;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\Security;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Annotation\Route;
+
+/**
+ * @Route(path="/reporting/customer/monthly_projects")
+ * @Security("is_granted('view_reporting') and is_granted('view_other_reporting') and is_granted('view_other_timesheet')")
+ */
+final class CustomerMonthlyProjectsController extends AbstractController
+{
+    /**
+     * @Route(path="/view", name="report_customer_monthly_projects", methods={"GET","POST"})
+     */
+    public function report(Request $request, TimesheetStatisticService $statisticService, UserRepository $userRepository): Response
+    {
+        return $this->render(
+            'reporting/customer/monthly_projects.html.twig',
+            $this->getData($request, $statisticService, $userRepository)
+        );
+    }
+
+    /**
+     * @Route(path="/export", name="report_customer_monthly_projects_export", methods={"GET","POST"})
+     */
+    public function export(Request $request, TimesheetStatisticService $statisticService, UserRepository $userRepository): Response
+    {
+        $data = $this->getData($request, $statisticService, $userRepository);
+
+        $content = $this->render('reporting/customer/monthly_projects_export.html.twig', $data)->getContent();
+
+        $reader = new Html();
+        $spreadsheet = $reader->loadFromString($content);
+
+        $writer = new BinaryFileResponseWriter(new XlsxWriter(), 'kimai-export-users-monthly');
+
+        return $writer->getFileResponse($spreadsheet);
+    }
+
+    private function getData(Request $request, TimesheetStatisticService $statisticService, UserRepository $userRepository): array
+    {
+        $currentUser = $this->getUser();
+        $dateTimeFactory = $this->getDateTimeFactory();
+
+        $query = new UserQuery();
+        $query->setCurrentUser($currentUser);
+        $allUsers = $userRepository->getUsersForQuery($query);
+
+        $values = new CustomerMonthlyProjects();
+        $values->setDate($dateTimeFactory->getStartOfMonth());
+
+        $form = $this->createFormForGetRequest(CustomerMonthlyProjectsForm::class, $values, [
+            'timezone' => $dateTimeFactory->getTimezone()->getName(),
+            'start_date' => $values->getDate(),
+        ]);
+
+        $form->submit($request->query->all(), false);
+
+        if ($form->isSubmitted() && !$form->isValid()) {
+            $values->setDate($dateTimeFactory->getStartOfMonth());
+        }
+
+        if ($values->getDate() === null) {
+            $values->setDate($dateTimeFactory->getStartOfMonth());
+        }
+
+        $start = $values->getDate();
+        $start = $dateTimeFactory->getStartOfMonth($start);
+        $end = $dateTimeFactory->getEndOfMonth($start);
+
+        $previous = clone $start;
+        $previous->modify('-1 month');
+
+        $next = clone $start;
+        $next->modify('+1 month');
+
+        $stats = $statisticService->getGroupedByCustomerProjectActivityUser($start, $end, $allUsers);
+
+        return [
+            'dataType' => $values->getSumType(),
+            'report_title' => 'report_customer_monthly_projects',
+            'export_route' => 'report_customer_monthly_projects_export',
+            'form' => $form->createView(),
+            'current' => $start,
+            'next' => $next,
+            'previous' => $previous,
+            'decimal' => $values->isDecimal(),
+            'stats' => $stats,
+        ];
+    }
+}
diff --git a/src/Controller/Security/SecurityController.php b/src/Controller/Security/SecurityController.php
index 66a1b866..ebea51d7 100644
--- a/src/Controller/Security/SecurityController.php
+++ b/src/Controller/Security/SecurityController.php
@@ -32,6 +32,10 @@ final class SecurityController extends AbstractController
      */
     public function loginAction(Request $request): Response
     {
+        if ($this->isGranted('IS_AUTHENTICATED_FULLY')) {
+            return $this->redirectToRoute('homepage');
+        }
+
         /** @var SessionInterface $session */
         $session = $request->getSession();
 
diff --git a/src/Invoice/Hydrator/InvoiceItemDefaultHydrator.php b/src/Invoice/Hydrator/InvoiceItemDefaultHydrator.php
index 2ba3caa9..f3607ab5 100644
--- a/src/Invoice/Hydrator/InvoiceItemDefaultHydrator.php
+++ b/src/Invoice/Hydrator/InvoiceItemDefaultHydrator.php
@@ -32,7 +32,11 @@ class InvoiceItemDefaultHydrator implements InvoiceItemHydrator
         $rate = $item->getRate();
         $internalRate = $item->getInternalRate();
         $appliedRate = $item->getHourlyRate();
-        $amount = $formatter->getFormattedDuration($item->getDuration());
+        if ($this->model->getTemplate()->isDecimalDuration()) {
+            $amount = $formatter->getFormattedDecimalDuration($item->getDuration());
+        } else {
+            $amount = $formatter->getFormattedDuration($item->getDuration());
+        }
         $description = $item->getDescription();
 
         if ($item->isFixedRate()) {
diff --git a/src/Reporting/CustomerMonthlyProjects/CustomerMonthlyProjects.php b/src/Reporting/CustomerMonthlyProjects/CustomerMonthlyProjects.php
new file mode 100644
index 00000000..18194669
--- /dev/null
+++ b/src/Reporting/CustomerMonthlyProjects/CustomerMonthlyProjects.php
@@ -0,0 +1,16 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Reporting\CustomerMonthlyProjects;
+
+use App\Reporting\AbstractUserList;
+
+final class CustomerMonthlyProjects extends AbstractUserList
+{
+}
diff --git a/src/Reporting/CustomerMonthlyProjects/CustomerMonthlyProjectsForm.php b/src/Reporting/CustomerMonthlyProjects/CustomerMonthlyProjectsForm.php
new file mode 100644
index 00000000..e884b174
--- /dev/null
+++ b/src/Reporting/CustomerMonthlyProjects/CustomerMonthlyProjectsForm.php
@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Reporting\CustomerMonthlyProjects;
+
+use App\Form\Type\MonthPickerType;
+use App\Form\Type\ReportSumType;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+class CustomerMonthlyProjectsForm extends AbstractType
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        $builder->add('date', MonthPickerType::class, [
+            'model_timezone' => $options['timezone'],
+            'view_timezone' => $options['timezone'],
+            'start_date' => $options['start_date'],
+        ]);
+        $builder->add('sumType', ReportSumType::class);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $resolver->setDefaults([
+            'data_class' => CustomerMonthlyProjects::class,
+            'timezone' => date_default_timezone_get(),
+            'start_date' => new \DateTime(),
+            'csrf_protection' => false,
+            'method' => 'GET',
+        ]);
+    }
+}
diff --git a/src/Reporting/ReportingService.php b/src/Reporting/ReportingService.php
index f37ca5d8..be8dcbaa 100644
--- a/src/Reporting/ReportingService.php
+++ b/src/Reporting/ReportingService.php
@@ -60,6 +60,9 @@ final class ReportingService
                 $event->addReport(new Report('daterange_projects', 'report_project_daterange', 'report_project_daterange', 'project'));
                 $event->addReport(new Report('inactive_projects', 'report_project_inactive', 'report_inactive_project', 'project'));
             }
+            if ($this->security->isGranted('view_other_reporting') && $this->security->isGranted('view_other_timesheet')) {
+                $event->addReport(new Report('report_customer_monthly_projects', 'report_customer_monthly_projects', 'report_customer_monthly_projects', 'customer'));
+            }
 
             $this->dispatcher->dispatch($event);
         }
diff --git a/src/Repository/TimesheetRepository.php b/src/Repository/TimesheetRepository.php
index 2659e7e6..c2a5b060 100644
--- a/src/Repository/TimesheetRepository.php
+++ b/src/Repository/TimesheetRepository.php
@@ -55,7 +55,7 @@ class TimesheetRepository extends EntityRepository
     public const STATS_QUERY_MONTHLY = 'monthly';
 
     /**
-     * Fetches the raw data of an timesheet, to allow comparison eg. of submitted and previously stored data.
+     * Fetches the raw data of a timesheet, to allow comparison e.g. of submitted and previously stored data.
      *
      * @param Timesheet $id
      * @return array
@@ -66,6 +66,8 @@ class TimesheetRepository extends EntityRepository
         $qb
             ->select([
                 't.rate',
+                't.begin',
+                't.end',
                 't.duration',
                 't.hourlyRate',
                 't.billable',
diff --git a/src/Timesheet/TimesheetStatisticService.php b/src/Timesheet/TimesheetStatisticService.php
index bb0944cd..13737364 100644
--- a/src/Timesheet/TimesheetStatisticService.php
+++ b/src/Timesheet/TimesheetStatisticService.php
@@ -9,11 +9,16 @@
 
 namespace App\Timesheet;
 
+use App\Entity\Activity;
+use App\Entity\Customer;
+use App\Entity\Project;
 use App\Entity\User;
 use App\Model\DailyStatistic;
 use App\Model\MonthlyStatistic;
 use App\Repository\TimesheetRepository;
 use DateTime;
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\Query\Expr\Join;
 
 final class TimesheetStatisticService
 {
@@ -21,10 +26,12 @@ final class TimesheetStatisticService
      * @var TimesheetRepository
      */
     private $repository;
+    private $entityManager;
 
-    public function __construct(TimesheetRepository $repository)
+    public function __construct(TimesheetRepository $repository, EntityManagerInterface $entityManager)
     {
         $this->repository = $repository;
+        $this->entityManager = $entityManager;
     }
 
     /**
@@ -323,4 +330,141 @@ final class TimesheetStatisticService
 
         return array_values($stats);
     }
+
+    /**
+     * @param DateTime $begin
+     * @param DateTime $end
+     * @param User[] $users
+     * @return array
+     */
+    public function getGroupedByCustomerProjectActivityUser(DateTime $begin, DateTime $end, array $users): array
+    {
+        $stats = [];
+
+        $qb = $this->repository->createQueryBuilder('t');
+        $qb
+            ->select('COALESCE(SUM(t.rate), 0) as rate')
+            ->addSelect('COALESCE(SUM(t.duration), 0) as duration')
+            ->addSelect('COALESCE(SUM(t.internalRate), 0) as internalRate')
+            ->addSelect('IDENTITY(t.user) as user')
+            ->addSelect('IDENTITY(t.activity) as activity')
+            ->addSelect('IDENTITY(t.project) as project')
+            ->where($qb->expr()->isNotNull('t.end'))
+            ->andWhere($qb->expr()->between('t.begin', ':begin', ':end'))
+            ->andWhere($qb->expr()->in('t.user', ':user'))
+            ->setParameter('begin', $begin)
+            ->setParameter('end', $end)
+            ->setParameter('user', $users)
+            ->groupBy('project')
+            ->addGroupBy('activity')
+            ->addGroupBy('user')
+        ;
+
+        $results = $qb->getQuery()->getResult();
+
+        $projectIds = [];
+        $activityIds = [];
+        $userIds = [];
+
+        foreach ($results as $row) {
+            $projectId = $row['project'];
+            $activityId = $row['activity'];
+            $userId = $row['user'];
+
+            $projectIds[$projectId] = $projectId;
+            $activityIds[$activityId] = $activityId;
+            $userIds[$userId] = $userId;
+
+            if (!isset($stats[$projectId])) {
+                $stats[$projectId] = [
+                    'id' => $projectId,
+                    'name' => null,
+                    'activities' => [],
+                    'duration' => 0,
+                    'rate' => 0,
+                    'internalRate' => 0,
+                    'max_users' => 0,
+                ];
+            }
+
+            $stats[$projectId]['duration'] += (int) $row['duration'];
+            $stats[$projectId]['rate'] += (int) $row['rate'];
+            $stats[$projectId]['internalRate'] += (int) $row['internalRate'];
+
+            if (!isset($stats[$projectId]['activities'][$activityId])) {
+                $stats[$projectId]['activities'][$activityId] = [
+                    'id' => $activityId,
+                    'name' => null,
+                    'users' => [],
+                    'duration' => 0,
+                    'rate' => 0,
+                    'internalRate' => 0,
+                ];
+            }
+
+            $stats[$projectId]['activities'][$activityId]['duration'] += (int) $row['duration'];
+            $stats[$projectId]['activities'][$activityId]['rate'] += (int) $row['rate'];
+            $stats[$projectId]['activities'][$activityId]['internalRate'] += (int) $row['internalRate'];
+
+            if (!isset($stats[$projectId]['activities'][$activityId]['users'][$userId])) {
+                $stats[$projectId]['activities'][$activityId]['users'][$userId] = [
+                    'id' => $userId,
+                    'name' => null,
+                    'duration' => 0,
+                    'rate' => 0,
+                    'internalRate' => 0,
+                ];
+            }
+
+            $stats[$projectId]['activities'][$activityId]['users'][$userId]['duration'] += (int) $row['duration'];
+            $stats[$projectId]['activities'][$activityId]['users'][$userId]['rate'] += (int) $row['rate'];
+            $stats[$projectId]['activities'][$activityId]['users'][$userId]['internalRate'] += (int) $row['internalRate'];
+        }
+
+        $qb = $this->entityManager->createQueryBuilder();
+        $qb
+            ->select('a.id, a.name')
+            ->from(Activity::class, 'a', 'a.id')
+            ->where($qb->expr()->in('a.id', ':id'))
+            ->setParameter('id', array_values($activityIds))
+        ;
+        $activities = $qb->getQuery()->getResult();
+
+        $qb = $this->entityManager->createQueryBuilder();
+        $qb
+            ->select('p.id, p.name, c.id as customer_id, c.name as customer, c.currency')
+            ->from(Project::class, 'p', 'p.id')
+            ->leftJoin(Customer::class, 'c', Join::WITH, 'c.id = p.customer')
+            ->where($qb->expr()->in('p.id', ':id'))
+            ->setParameter('id', array_values($projectIds))
+        ;
+        $projects = $qb->getQuery()->getResult();
+
+        $qb = $this->entityManager->createQueryBuilder();
+        $qb
+            ->select('u')
+            ->from(User::class, 'u', 'u.id')
+            ->where($qb->expr()->in('u.id', ':id'))
+            ->setParameter('id', array_values($userIds))
+        ;
+        $users = $qb->getQuery()->getResult();
+
+        foreach (array_keys($stats) as $pid) {
+            $stats[$pid]['name'] = $projects[$pid]['name'];
+            foreach (array_keys($stats[$pid]['activities']) as $aid) {
+                $stats[$pid]['activities'][$aid]['name'] = $activities[$aid]['name'];
+                foreach (array_keys($stats[$pid]['activities'][$aid]['users']) as $uid) {
+                    $stats[$pid]['activities'][$aid]['users'][$uid]['name'] = $users[$uid]->getDisplayName();
+                }
+                $stats[$pid]['max_users'] = max($stats[$pid]['max_users'], \count($stats[$pid]['activities'][$aid]['users']));
+            }
+        }
+
+        return [
+            'stats' => $stats,
+            'projects' => $projects,
+            'activities' => $activities,
+            'users' => $users,
+        ];
+    }
 }
diff --git a/src/Validator/Constraints/TimesheetBudgetUsedValidator.php b/src/Validator/Constraints/TimesheetBudgetUsedValidator.php
index 420fd6da..8a7e7d3b 100644
--- a/src/Validator/Constraints/TimesheetBudgetUsedValidator.php
+++ b/src/Validator/Constraints/TimesheetBudgetUsedValidator.php
@@ -97,7 +97,7 @@ final class TimesheetBudgetUsedValidator extends ConstraintValidator
             // if an existing entry was updated, but "duration", "rate" and "billable" were not changed:
             // do not validate! this could for example happen when export flag is changed OR if "prevent overbooking"
             // config was recently activated and this is an old entry
-            if ($duration === $rawData['duration'] && $rate === $rawData['rate'] && $timesheet->isBillable() === $rawData['billable']) {
+            if ($duration === $rawData['duration'] && $rate === $rawData['rate'] && $timesheet->isBillable() === $rawData['billable'] && $timesheet->getBegin()->format('Y.m.d') === $rawData['begin']->format('Y.m.d')) {
                 return;
             }
 
@@ -174,12 +174,12 @@ final class TimesheetBudgetUsedValidator extends ConstraintValidator
 
     private function addBudgetViolation(TimesheetBudgetUsed $constraint, Timesheet $timesheet, string $field, float $budget, float $rate)
     {
-        // using the locale of the assigned user is not the best solution, but allows to be independent from the request stack
+        // using the locale of the assigned user is not the best solution, but allows to be independent of the request stack
         $helper = new LocaleHelper($timesheet->getUser()->getLanguage());
         $currency = $timesheet->getProject()->getCustomer()->getCurrency();
 
         $free = $budget - $rate;
-        $free = $free > 0 ? $free : 0;
+        $free = max($free, 0);
 
         $this->context->buildViolation($constraint->messageRate)
             ->atPath($field)
@@ -198,7 +198,7 @@ final class TimesheetBudgetUsedValidator extends ConstraintValidator
         $durationFormat = new Duration();
 
         $free = $budget - $duration;
-        $free = $free > 0 ? $free : 0;
+        $free = max($free, 0);
 
         $this->context->buildViolation($constraint->messageTime)
             ->atPath($field)
diff --git a/templates/reporting/customer/monthly_projects.html.twig b/templates/reporting/customer/monthly_projects.html.twig
new file mode 100644
index 00000000..74a55ef8
--- /dev/null
+++ b/templates/reporting/customer/monthly_projects.html.twig
@@ -0,0 +1,52 @@
+{% extends 'reporting/layout.html.twig' %}
+
+{% block report_title %}{{ report_title|trans({}, 'reporting') }}{% endblock %}
+
+{% block report %}
+
+    {% embed '@AdminLTE/Widgets/box-widget.html.twig' %}
+        {% from "macros/widgets.html.twig" import nothing_found %}
+        {% block box_before %}
+            {{ form_start(form, {'attr': {'class': 'form-inline form-reporting', 'id': 'report-toolbar-form'}}) }}
+        {% endblock %}
+        {% block box_after %}
+            {{ form_end(form) }}
+        {% endblock %}
+        {% block box_title %}
+            {{ form_widget(form.date) }}
+            {% if form.sumType.vars.choices|length > 1 %}
+                <div class="btn-group">
+                    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                        <i class="{{ 'display'|icon }}"></i> <span class="caret"></span>
+                    </button>
+                    <ul class="dropdown-menu checkbox-menu">
+                        <li>
+                            {{ form_widget(form.sumType) }}
+                        </li>
+                    </ul>
+                </div>
+            {% endif %}
+            <button class="btn btn-primary" formaction="{{ path(export_route) }}" type="submit"><i class="{{ 'download'|icon }}"></i></button>
+        {% endblock %}
+        {% block box_body_class %} table-responsive {% if stats is not empty %}no-padding{% endif %}{% endblock %}
+        {% block box_body %}
+            {% if stats is empty %}
+                {{ nothing_found() }}
+            {% else %}
+                {% embed 'reporting/customer/monthly_projects_data.html.twig' with {'dataTypeFormat': null, 'stats': stats, 'dataType': dataType, 'decimal': decimal} only %}
+                    {% set rowspanStyle = 'vertical-align: middle' %}
+                {% endembed %}
+            {% endif %}
+        {% endblock %}
+    {% endembed %}
+
+{% endblock %}
+
+{% block javascripts %}
+    {{ parent() }}
+    <script type="text/javascript">
+        jQuery('#report-toolbar-form').on('change', function(ev) {
+            jQuery(this).submit();
+        });
+    </script>
+{% endblock %}
diff --git a/templates/reporting/customer/monthly_projects_data.html.twig b/templates/reporting/customer/monthly_projects_data.html.twig
new file mode 100644
index 00000000..225003f6
--- /dev/null
+++ b/templates/reporting/customer/monthly_projects_data.html.twig
@@ -0,0 +1,100 @@
+{%- set absoluteDuration = 0 -%}
+{%- set absoluteInternalRate = 0 -%}
+{%- set absoluteRate = 0 -%}
+{%- set totalsDuration = {} -%}
+{%- set totalsInternalRate = {} -%}
+{%- set totalsRate = {} -%}
+{% if dataType == 'rate' %}
+    {% set dataTypeTitle = 'stats.amountTotal' %}
+{% elseif dataType == 'internalRate' %}
+    {% set dataTypeTitle = 'label.rate_internal' %}
+{% else %}
+    {% set dataTypeTitle = 'stats.durationTotal' %}
+{% endif %}
+<table class="table table-bordered dataTable">
+    <thead>
+        <tr>
+            <th rowspan="2" style="{{ rowspanStyle }}">{{ 'label.project'|trans }}</th>
+            {% for activity in stats.activities %}
+                <th colspan="3" class="text-center">{{ activity.name }}</th>
+            {% endfor %}
+            <th rowspan="2" style="{{ rowspanStyle }}">{{ dataTypeTitle|trans }}</th>
+        </tr>
+        <tr>
+            {% for activity in stats.activities %}
+                <th class="text-center">{{ 'label.user'|trans }}</th>
+                <th class="text-center">{{ dataTypeTitle|trans }}</th>
+                <th class="text-center">{{ 'sum.total'|trans }}</th>
+            {% endfor %}
+        </tr>
+    </thead>
+    {% set customer = null %}
+    {% set maxLength = (stats.activities|length) * 3 + 2 %}
+    <tbody>
+    {% for project in stats.stats %}
+        {% set activityId = null %}
+        {% set rowspan = project['max_users'] %}
+        {% set currency = stats.projects[project.id]['currency'] %}
+        {% if customer != stats.projects[project.id]['customer_id'] %}
+            <tr class="summary">
+                <td colspan="{{ maxLength }}">{{ stats.projects[project.id]['customer'] }}</td>
+            </tr>
+            {% set customer = stats.projects[project.id]['customer_id'] %}
+        {% endif %}
+
+        {% for i in 1..rowspan %}
+        <tr>
+            {% if loop.first %}
+            <th{% if rowspan > 1 %} rowspan="{{ rowspan }}" style="{{ rowspanStyle }}"{% endif %}>{{ project.name }}</th>
+            {% endif %}
+            {% for activity in stats.activities %}
+                {% if project.activities[activity.id] is defined and i <= project.activities[activity.id]['users']|length %}
+                    {% set user = project.activities[activity.id]['users']|slice(-i) %}
+                    <td>{{ user.0.name }}</td>
+                    <td class="text-center"{% if dataTypeFormat is not null %} data-format="{{ dataTypeFormat }}"{% endif %}>
+                        {% set value = user.0[dataType] %}
+                        {% block user_activity %}
+                            {% if dataType == 'rate' or dataType == 'internalRate' %}
+                                {{ value|money(currency) }}
+                            {% else %}
+                                {{ value|duration(decimal) }}
+                            {% endif %}
+                        {% endblock %}
+                    </td>
+                    {% if loop.parent.loop.first %}
+                    <td{% if rowspan > 1 %} rowspan="{{ rowspan }}"{% endif %} class="text-center text-nowrap"{% if dataTypeFormat is not null %} data-format="{{ dataTypeFormat }}"{% endif %}>
+                        {% set value = project.activities[activity.id][dataType] %}
+                        {% block project_activity %}
+                            {% if dataType == 'rate' or dataType == 'internalRate' %}
+                                {{ value|money(currency) }}
+                            {% else %}
+                                {{ value|duration(decimal) }}
+                            {% endif %}
+                        {% endblock %}
+                    </td>
+                    {% endif %}
+                {% else %}
+                    <td class="text-center"></td>
+                    <td class="text-center"></td>
+                    {% if loop.parent.loop.first %}
+                    <td{% if rowspan > 1 %} rowspan="{{ rowspan }}"{% endif %}></td>
+                    {% endif %}
+                {% endif %}
+            {% endfor %}
+            {% if loop.first %}
+                <th{% if rowspan > 1 %} rowspan="{{ rowspan }}" style="{{ rowspanStyle }}"{% endif %} class="text-center text-nowrap"{% if dataTypeFormat is not null %} data-format="{{ dataTypeFormat }}"{% endif %}>
+                    {% set value = project[dataType] %}
+                    {% block project_total %}
+                        {% if dataType == 'rate' or dataType == 'internalRate' %}
+                            {{ value|money(currency) }}
+                        {% else %}
+                            {{ value|duration(decimal) }}
+                        {% endif %}
+                    {% endblock %}
+                </th>
+            {% endif %}
+        </tr>
+        {% endfor %}
+    {% endfor %}
+    </tbody>
+</table>
diff --git a/templates/reporting/customer/monthly_projects_export.html.twig b/templates/reporting/customer/monthly_projects_export.html.twig
new file mode 100644
index 00000000..52186efe
--- /dev/null
+++ b/templates/reporting/customer/monthly_projects_export.html.twig
@@ -0,0 +1,30 @@
+{% embed 'reporting/customer/monthly_projects_data.html.twig' with {'decimal': true, 'stats': stats, 'dataType': dataType} only %}
+    {% set dataTypeFormat = null %}
+    {% if dataType == 'rate' or dataType == 'internalRate' %}
+        {% set dataTypeFormat = constant('App\\Export\\Base\\AbstractSpreadsheetRenderer::RATE_FORMAT_NO_CURRENCY') %}
+    {% elseif dataType == 'duration' %}
+        {% set dataTypeFormat = constant('App\\Export\\Base\\AbstractSpreadsheetRenderer::DURATION_DECIMAL') %}
+    {% endif %}
+    {% set rowspanStyle = 'vertical-align:center' %}
+    {% block user_activity %}
+        {% if dataType == 'rate' or dataType == 'internalRate' %}
+            {{ value|money(currency) }}
+        {% else %}
+            {{ value / 3600 }}
+        {% endif %}
+    {% endblock %}
+    {% block project_activity %}
+        {% if dataType == 'rate' or dataType == 'internalRate' %}
+            {{ value|money(currency) }}
+        {% else %}
+            {{ value / 3600 }}
+        {% endif %}
+    {% endblock %}
+    {% block project_total %}
+        {% if dataType == 'rate' or dataType == 'internalRate' %}
+            {{ value|money(currency) }}
+        {% else %}
+            {{ value / 3600 }}
+        {% endif %}
+    {% endblock %}
+{% endembed %}
diff --git a/tests/Controller/Reporting/CustomerMonthlyProjectsControllerTest.php b/tests/Controller/Reporting/CustomerMonthlyProjectsControllerTest.php
new file mode 100644
index 00000000..30f0f551
--- /dev/null
+++ b/tests/Controller/Reporting/CustomerMonthlyProjectsControllerTest.php
@@ -0,0 +1,103 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Controller\Reporting;
+
+use App\Entity\Project;
+use App\Entity\User;
+use App\Tests\Controller\ControllerBaseTest;
+use App\Tests\DataFixtures\ActivityFixtures;
+use App\Tests\DataFixtures\CustomerFixtures;
+use App\Tests\DataFixtures\ProjectFixtures;
+use App\Tests\DataFixtures\TimesheetFixtures;
+use Symfony\Component\HttpFoundation\BinaryFileResponse;
+use Symfony\Component\HttpKernel\HttpKernelBrowser;
+
+/**
+ * @group integration
+ */
+class CustomerMonthlyProjectsControllerTest extends ControllerBaseTest
+{
+    public function testReportIsSecure()
+    {
+        $this->assertUrlIsSecured('/reporting/customer/monthly_projects/view');
+    }
+
+    public function testExportReportIsSecure()
+    {
+        $this->assertUrlIsSecured('/reporting/customer/monthly_projects/export');
+    }
+
+    private function prepareReport(): HttpKernelBrowser
+    {
+        $client = $this->getClientForAuthenticatedUser(User::ROLE_ADMIN);
+
+        $customers = new CustomerFixtures();
+        $customers->setIsVisible(true);
+        $customers->setAmount(1);
+        $customers = $this->importFixture($customers);
+
+        $projects = new ProjectFixtures();
+        $projects->setCustomers($customers);
+        $projects->setAmount(2);
+        $projects->setIsVisible(true);
+        $projects->setCallback(function (Project $project) {
+            $project->setIsMonthlyBudget();
+        });
+        $this->importFixture($projects);
+
+        $activities = new ActivityFixtures();
+        $activities->setAmount(5);
+        $activities->setIsGlobal(true);
+        $activities = $this->importFixture($activities);
+
+        $timesheets = new TimesheetFixtures();
+        $timesheets->setAmount(10);
+        $timesheets->setActivities($activities);
+        $timesheets->setStartDate(new \DateTime('first day of this month'));
+        $timesheets->setUser($this->getUserByRole(User::ROLE_TEAMLEAD));
+        $this->importFixture($timesheets);
+        $timesheets = new TimesheetFixtures();
+        $timesheets->setAmount(10);
+        $timesheets->setActivities($activities);
+        $timesheets->setStartDate(new \DateTime('first day of last month'));
+        $timesheets->setUser($this->getUserByRole(User::ROLE_TEAMLEAD));
+        $this->importFixture($timesheets);
+
+        return $client;
+    }
+
+    public function testReport()
+    {
+        $client = $this->prepareReport();
+
+        $this->assertAccessIsGranted($client, '/reporting/customer/monthly_projects/view');
+        self::assertStringContainsString('<form method="get" class="form-inline form-reporting" id="report-toolbar-form">', $client->getResponse()->getContent());
+        $rows = $client->getCrawler()->filterXPath("//table[contains(@class, 'dataTable')]/tbody/tr[not(@class='summary')]");
+        self::assertGreaterThan(0, $rows->count());
+    }
+
+    public function testExport()
+    {
+        $client = $this->prepareReport();
+
+        $this->assertAccessIsGranted($client, '/reporting/customer/monthly_projects/export');
+
+        $response = $client->getResponse();
+        $this->assertTrue($response->isSuccessful());
+        self::assertInstanceOf(BinaryFileResponse::class, $response);
+
+        // temporary file!
+        $file = $response->getFile();
+        self::assertFileDoesNotExist($response->getFile());
+
+        $this->assertEquals('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', $response->headers->get('Content-Type'));
+        $this->assertStringContainsString('attachment; filename=kimai-export-users-', $response->headers->get('Content-Disposition'));
+    }
+}
diff --git a/tests/Controller/Security/SecurityControllerTest.php b/tests/Controller/Security/SecurityControllerTest.php
index d423bc88..047bdbd7 100644
--- a/tests/Controller/Security/SecurityControllerTest.php
+++ b/tests/Controller/Security/SecurityControllerTest.php
@@ -10,6 +10,7 @@
 namespace App\Tests\Controller\Security;
 
 use App\Controller\Security\SecurityController;
+use App\Entity\User;
 use App\Tests\Controller\ControllerBaseTest;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
 
@@ -76,6 +77,21 @@ class SecurityControllerTest extends ControllerBaseTest
         $this->assertTrue($client->getResponse()->isSuccessful());
     }
 
+    public function testLoginAlreadyLoggedIn()
+    {
+        $client = $this->getClientForAuthenticatedUser(User::ROLE_TEAMLEAD);
+
+        $this->request($client, '/login');
+
+        $this->assertIsRedirect($client, '/homepage'); // redirect to homepage
+        $client->followRedirect();
+
+        $this->assertIsRedirect($client, '/timesheet/'); // redirect to configured start page
+        $client->followRedirect();
+
+        $this->assertTrue($client->getResponse()->isSuccessful());
+    }
+
     public function testLoginNegative()
     {
         $client = self::createClient();
diff --git a/tests/Reporting/ReportingServiceTest.php b/tests/Reporting/ReportingServiceTest.php
index 58af2c63..ed195eb6 100644
--- a/tests/Reporting/ReportingServiceTest.php
+++ b/tests/Reporting/ReportingServiceTest.php
@@ -47,6 +47,6 @@ class ReportingServiceTest extends TestCase
         $sut = $this->getSut(true);
         $reports = $sut->getAvailableReports(new User());
         self::assertIsArray($reports);
-        self::assertCount(10, $reports);
+        self::assertCount(11, $reports);
     }
 }
diff --git a/tests/Validator/Constraints/TimesheetBudgetUsedValidatorTest.php b/tests/Validator/Constraints/TimesheetBudgetUsedValidatorTest.php
index 07bf1f64..25bedff6 100644
--- a/tests/Validator/Constraints/TimesheetBudgetUsedValidatorTest.php
+++ b/tests/Validator/Constraints/TimesheetBudgetUsedValidatorTest.php
@@ -190,66 +190,72 @@ class TimesheetBudgetUsedValidatorTest extends ConstraintValidatorTestCase
     {
         return [
             // activity: violations ----------------------------------------------------------------------
-            //        previously logged                          available budgets                       expected violation                              duration            entry currently in database
-            'a_a' => [1230, null, null, null, null, null,       3600, null, null, null, null, null,     '00:20', '00:39', '01:00', 'activity',          '+3600 seconds'],
-            'a_b' => [null, 1001.0, null, null, null, null,     null, 1000.0, null, null, null, null,   '€1,001.00', '€0.00', '€1,000.00', 'activity',  '+3600 seconds'],
+            //        previously logged                         available budgets                                           expected violation                              duration            entry currently in database
+            'a_a' => [1230, null, null, null, null, null,       null, 3600, null, null, null, null, null, null, null,       '00:20', '00:39', '01:00', 'activity',          '+3600 seconds'],
+            'a_b' => [null, 1001.0, null, null, null, null,     null, null, 1000.0, null, null, null, null, null, null,     '€1,001.00', '€0.00', '€1,000.00', 'activity',  '+3600 seconds'],
 
             // activity: no violations
-            'a_c' => [1230, null, null, null, null, null,       null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
-            'a_d' => [null, 1001.0, null, null, null, null,     null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
-            'a_e' => [1230, 1001.0, null, null, null, null,     null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
+            'a_c' => [1230, null, null, null, null, null,       null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
+            'a_d' => [null, 1001.0, null, null, null, null,     null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
+            'a_e' => [1230, 1001.0, null, null, null, null,     null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
 
-            //        previously logged                          available budgets                       expected violation                              duration            entry currently in database
-            'a_f1' => [1320, null, null, null, null, null,       3600, null, null, null, null, null,     '00:22', '00:38', '01:00', 'activity',          '+3600 seconds',    ['rate' => 1.0, 'duration' => 1000]],
-            'a_h1' => [7200, null, null, null, null, null,       7200, null, null, null, null, null,     '02:00', '00:00', '02:00', 'activity',          '+3601 seconds',    ['rate' => 1.0, 'duration' => 3600]],
-            'a_h2' => [3601, null, null, null, null, null,       3600, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds',    ['rate' => 1.0, 'duration' => 3601]],
-            'a_g0' => [null, 1002.0, null, null, null, null,     null, 1000.0, null, null, null, null,   '1,002.00', '0.00', '1,000.00', 'activity',     '+3600 seconds',    ['rate' => 1.0, 'duration' => 1010]],
-            'a_g1' => [null, 1002.0, null, null, null, null,     null, 1000.0, null, null, null, null,   null, null, null, null,                         '+3600 seconds',    ['rate' => 2.0, 'duration' => 0]],
+            //        previously logged                         available budgets                                           expected violation                              duration            entry currently in database
+            'a_f1' => [1320, null, null, null, null, null,      null, 3600, null, null, null, null, null, null, null,       '00:22', '00:38', '01:00', 'activity',          '+3600 seconds',    ['rate' => 1.0, 'duration' => 1000]],
+            'a_h1' => [7200, null, null, null, null, null,      null, 7200, null, null, null, null, null, null, null,       '02:00', '00:00', '02:00', 'activity',          '+3601 seconds',    ['rate' => 1.0, 'duration' => 3600]],
+            'a_h2' => [3601, null, null, null, null, null,      null, 3600, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds',    ['rate' => 1.0, 'duration' => 3601]],
+            'a_g0' => [null, 1002.0, null, null, null, null,    null, null, 1000.0, null, null, null, null, null, null,     '1,002.00', '0.00', '1,000.00', 'activity',     '+3600 seconds',    ['rate' => 1.0, 'duration' => 1010]],
+            'a_g1' => [null, 1002.0, null, null, null, null,    null, null, 1000.0, null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds',    ['rate' => 2.0, 'duration' => 0]],
             // nothing changed => no violation
-            'a_x1' => [3600, 1000.0, null, null, null, null,     3600, 1000.0, null, null, null, null,   null, null, null, null,                         '+3600 seconds',    ['rate' => 1000.0, 'duration' => 3600], new Rate(1000.0, 0.00)],
+            'a_x1' => [3600, 1000.0, null, null, null, null,    null, 3600, 1000.0, null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds',    ['rate' => 1000.0, 'duration' => 3600], new Rate(1000.0, 0.00)],
+            // date changed => violation
+            'a_x2' => [3600, 1000.0, null, null, null, null,    'month', 3600, 1000.0, null, null, null, null, null, null,  '1,000.00', '0.00', '1,000.00', 'activity',     '+3600 seconds',    ['rate' => 999.0, 'duration' => 3599, 'begin' => new DateTime('2021-03-17 16:15:00'), 'end' => new DateTime('2021-03-17 17:15:01'), 'billable' => true], new Rate(1000.0, 0.00)],
+            // date changed but not violation was raised
+            'a_x3' => [3600, 1000.0, null, null, null, null,    'month', 3600, 1000.0, null, null, null, null, null, null,  null, null, null, null,                         '+3600 seconds',    ['rate' => 999.0, 'duration' => 3599, 'begin' => new DateTime('2021-03-17 16:15:00'), 'end' => new DateTime('2021-03-17 17:15:01'), 'billable' => false], new Rate(1000.0, 0.00)],
+            'a_x4' => [3600, 1000.0, null, null, null, null,    'month', 3600, 1000.0, null, null, null, null, null, null,  null, null, null, null,                         '+3600 seconds',    ['rate' => 1000.0, 'duration' => 3600, 'begin' => new DateTime('2021-03-17 16:15:00'), 'end' => new DateTime('2021-03-17 17:15:01'), 'billable' => true], new Rate(1000.0, 0.00)],
+            'a_x5' => [3600, 1000.0, null, null, null, null,    'month', 3600, 1000.0, null, null, null, null, null, null,  null, null, null, null,                         '+3600 seconds',    ['rate' => 1000.0, 'duration' => 3600, 'begin' => new DateTime('2021-03-17 16:15:00'), 'end' => new DateTime('2021-03-17 17:15:01'), 'billable' => false], new Rate(1000.0, 0.00)],
 
             // project: violations ----------------------------------------------------------------------
-            'p_j' => [null, null, 1230, null, null, null,       null, null, 3600, null, null, null,     '00:20', '00:39', '01:00', 'project',           '+3600 seconds'],
-            'p_k' => [null, null, null, 1001.0, null, null,     null, null, null, 1000.0, null, null,   '€1,001.00', '€0.00', '€1,000.00', 'project',   '+3600 seconds'],
+            'p_j' => [null, null, 1230, null, null, null,       null, null, null, null, 3600, null, null, null, null,       '00:20', '00:39', '01:00', 'project',           '+3600 seconds'],
+            'p_k' => [null, null, null, 1001.0, null, null,     null, null, null, null, null, 1000.0, null, null, null,     '€1,001.00', '€0.00', '€1,000.00', 'project',   '+3600 seconds'],
 
-            //        previously logged                          available budgets                       expected violation                              duration            entry currently in database
-            'p_f1' => [null, null, 1320, null, null, null,       null, null, 3600, null, null, null,     '00:22', '00:38', '01:00', 'project',           '+3600 seconds',    ['rate' => 1.0, 'duration' => 1000]],
-            'p_h1' => [null, null, 7200, null, null, null,       null, null, 7200, null, null, null,     '02:00', '00:00', '02:00', 'project',           '+3601 seconds',    ['rate' => 1.0, 'duration' => 3600]],
-            'p_h2' => [null, null, 3601, null, null, null,       null, null, 3600, null, null, null,     null, null, null, null,                         '+3600 seconds',    ['rate' => 1.0, 'duration' => 3601]],
-            'p_g0' => [null, null, null, 1002.0, null, null,     null, null, null, 1000.0, null, null,   '1,002.00', '0.00', '1,000.00', 'project',      '+3600 seconds',    ['rate' => 1.0, 'duration' => 1010]],
-            'p_g1' => [null, null, null, 1002.0, null, null,     null, null, null, 1000.0, null, null,   null, null, null, null,                         '+3600 seconds',    ['rate' => 2.0, 'duration' => 0]],
+            //        previously logged                         available budgets                                           expected violation                              duration            entry currently in database
+            'p_f1' => [null, null, 1320, null, null, null,      null, null, null, null, 3600, null, null, null, null,       '00:22', '00:38', '01:00', 'project',           '+3600 seconds',    ['rate' => 1.0, 'duration' => 1000]],
+            'p_h1' => [null, null, 7200, null, null, null,      null, null, null, null, 7200, null, null, null, null,       '02:00', '00:00', '02:00', 'project',           '+3601 seconds',    ['rate' => 1.0, 'duration' => 3600]],
+            'p_h2' => [null, null, 3601, null, null, null,      null, null, null, null, 3600, null, null, null, null,       null, null, null, null,                         '+3600 seconds',    ['rate' => 1.0, 'duration' => 3601]],
+            'p_g0' => [null, null, null, 1002.0, null, null,    null, null, null, null, null, 1000.0, null, null, null,     '1,002.00', '0.00', '1,000.00', 'project',      '+3600 seconds',    ['rate' => 1.0, 'duration' => 1010]],
+            'p_g1' => [null, null, null, 1002.0, null, null,    null, null, null, null, null, 1000.0, null, null, null,     null, null, null, null,                         '+3600 seconds',    ['rate' => 2.0, 'duration' => 0]],
 
             // project: no violations
-            'p_n' => [null, null, 1230, null, null, null,       null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
-            'p_o' => [null, null, null, 1001.0, null, null,     null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
-            'p_p' => [null, null, 1230, 1001, null, null,       null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
+            'p_n' => [null, null, 1230, null, null, null,       null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
+            'p_o' => [null, null, null, 1001.0, null, null,     null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
+            'p_p' => [null, null, 1230, 1001, null, null,       null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
 
-            'p_q' => [1230, null, 1230, null, null, null,       null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
-            'p_r' => [1230, 1001.0, 1230, null, null, null,     null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
-            'p_s' => [null, 1001.0, null, 1001.0, null, null,   null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
-            'p_t' => [null, 1001.0, 1230, 1001.0, null, null,   null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
-            'p_u' => [1230, 1001.0, 1230, 1001.0, null, null,   null, null, null, null, null, null,     null, null, null, null,                         '+3600 seconds'],
+            'p_q' => [1230, null, 1230, null, null, null,       null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
+            'p_r' => [1230, 1001.0, 1230, null, null, null,     null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
+            'p_s' => [null, 1001.0, null, 1001.0, null, null,   null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
+            'p_t' => [null, 1001.0, 1230, 1001.0, null, null,   null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
+            'p_u' => [1230, 1001.0, 1230, 1001.0, null, null,   null, null, null, null, null, null, null, null, null,       null, null, null, null,                         '+3600 seconds'],
 
             // customer: violations ----------------------------------------------------------------------
-            'c_v' => [null, null, null, null, 1230, null,       null, null, null, null, 3600, null,     '00:20', '00:39', '01:00', 'customer',          '+3600 seconds'],
-            'c_w' => [null, null, null, null, null, 1001.0,     null, null, null, null, null, 1000.0,   '€1,001.00', '€0.00', '€1,000.00', 'customer',  '+3600 seconds'],
+            'c_v' => [null, null, null, null, 1230, null,       null, null, null, null, null, null, null, 3600, null,       '00:20', '00:39', '01:00', 'customer',          '+3600 seconds'],
+            'c_w' => [null, null, null, null, null, 1001.0,     null, null, null, null, null, null, null, null, 1000.0,     '€1,001.00', '€0.00', '€1,000.00', 'customer',  '+3600 seconds'],
 
-            //        previously logged                          available budgets                       expected violation                              duration            entry currently in database
-            'c_f1' => [null, null, null, null, 1320, null,       null, null, null, null, 3600, null,     '00:22', '00:38', '01:00', 'customer',          '+3600 seconds',    ['rate' => 1.0, 'duration' => 1000]],
-            'c_h1' => [null, null, null, null, 7200, null,       null, null, null, null, 7200, null,     '02:00', '00:00', '02:00', 'customer',          '+3601 seconds',    ['rate' => 1.0, 'duration' => 3600]],
-            'c_h2' => [null, null, null, null, 3601, null,       null, null, null, null, 3600, null,     null, null, null, null,                         '+3600 seconds',    ['rate' => 1.0, 'duration' => 3601]],
-            'c_g0' => [null, null, null, null, null, 1002.0,     null, null, null, null, null, 1000.0,   '1,002.00', '0.00', '1,000.00', 'customer',     '+3600 seconds',    ['rate' => 1.0, 'duration' => 1010]],
-            'c_g1' => [null, null, null, null, null, 1002.0,     null, null, null, null, null, 1000.0,   null, null, null, null,                         '+3600 seconds',    ['rate' => 2.0, 'duration' => 0]],
+            //        previously logged                         available budgets                                           expected violation                              duration            entry currently in database
+            'c_f1' => [null, null, null, null, 1320, null,      null, null, null, null, null, null, null, 3600, null,       '00:22', '00:38', '01:00', 'customer',          '+3600 seconds',    ['rate' => 1.0, 'duration' => 1000]],
+            'c_h1' => [null, null, null, null, 7200, null,      null, null, null, null, null, null, null, 7200, null,       '02:00', '00:00', '02:00', 'customer',          '+3601 seconds',    ['rate' => 1.0, 'duration' => 3600]],
+            'c_h2' => [null, null, null, null, 3601, null,      null, null, null, null, null, null, null, 3600, null,       null, null, null, null,                         '+3600 seconds',    ['rate' => 1.0, 'duration' => 3601]],
+            'c_g0' => [null, null, null, null, null, 1002.0,    null, null, null, null, null, null, null, null, 1000.0,     '1,002.00', '0.00', '1,000.00', 'customer',     '+3600 seconds',    ['rate' => 1.0, 'duration' => 1010]],
+            'c_g1' => [null, null, null, null, null, 1002.0,    null, null, null, null, null, null, null, null, 1000.0,     null, null, null, null,                         '+3600 seconds',    ['rate' => 2.0, 'duration' => 0]],
 
             // customer: no violations
-            'c_z' => [null, null, null, null, 1230, null,       null, null, null, null, null, null,     null, null, null, null, '+3600 seconds'],
-            'c_1' => [null, null, null, null, null, 1001.0,     null, null, null, null, null, null,     null, null, null, null, '+3600 seconds'],
-            'c_2' => [null, null, null, null, 1230, 1001.0,     null, null, null, null, null, null,     null, null, null, null, '+3600 seconds'],
-            'c_3' => [1230, null, 1230, null, 1230, null,       null, null, null, null, null, null,     null, null, null, null, '+3600 seconds'],
-            'c_4' => [1230, 1001.0, 1230, null, null, 1001.0,   null, null, null, null, null, null,     null, null, null, null, '+3600 seconds'],
-            'c_5' => [null, 1001.0, null, 1001.0, 1230, 1001.0, null, null, null, null, null, null,     null, null, null, null, '+3600 seconds'],
-            'c_6' => [null, 1001.0, 1230, 1001.0, 1230, null,   null, null, null, null, null, null,     null, null, null, null, '+3600 seconds'],
-            'c_7' => [1230, 1001.0, 1230, 1001.0, null, 1001.0, null, null, null, null, null, null,     null, null, null, null, '+3600 seconds'],
+            'c_z' => [null, null, null, null, 1230, null,       null, null, null, null, null, null, null, null, null,       null, null, null, null, '+3600 seconds'],
+            'c_1' => [null, null, null, null, null, 1001.0,     null, null, null, null, null, null, null, null, null,       null, null, null, null, '+3600 seconds'],
+            'c_2' => [null, null, null, null, 1230, 1001.0,     null, null, null, null, null, null, null, null, null,       null, null, null, null, '+3600 seconds'],
+            'c_3' => [1230, null, 1230, null, 1230, null,       null, null, null, null, null, null, null, null, null,       null, null, null, null, '+3600 seconds'],
+            'c_4' => [1230, 1001.0, 1230, null, null, 1001.0,   null, null, null, null, null, null, null, null, null,       null, null, null, null, '+3600 seconds'],
+            'c_5' => [null, 1001.0, null, 1001.0, 1230, 1001.0, null, null, null, null, null, null, null, null, null,       null, null, null, null, '+3600 seconds'],
+            'c_6' => [null, 1001.0, 1230, 1001.0, 1230, null,   null, null, null, null, null, null, null, null, null,       null, null, null, null, '+3600 seconds'],
+            'c_7' => [1230, 1001.0, 1230, 1001.0, null, 1001.0, null, null, null, null, null, null, null, null, null,       null, null, null, null, '+3600 seconds'],
         ];
     }
 
@@ -263,10 +269,13 @@ class TimesheetBudgetUsedValidatorTest extends ConstraintValidatorTestCase
         ?float $projectRate,
         ?int $customerDuration,
         ?float $customerRate,
+        ?string $activityBudgetType,
         ?int $activityTimeBudget,
         ?float $activityBudget,
+        ?string $projectBudgetType,
         ?int $projectTimeBudget,
         ?float $projectBudget,
+        ?string $customerBudgetType,
         ?int $customerTimeBudget,
         ?float $customerBudget,
         ?string $used,
@@ -334,9 +343,19 @@ class TimesheetBudgetUsedValidatorTest extends ConstraintValidatorTestCase
             if (!\array_key_exists('duration', $rawData)) {
                 $rawData['duration'] = 0;
             }
+            if (!\array_key_exists('begin', $rawData)) {
+                $rawData['begin'] = clone $begin;
+            }
+            if (!\array_key_exists('end', $rawData)) {
+                $rawData['end'] = clone $end;
+            }
             $activity = $this->createMock(Activity::class);
             $activity->method('getId')->willReturn($rawData['activity']);
             $activity->method('isMonthlyBudget')->willReturn(false);
+            if ($activityBudgetType !== null) {
+                $activity->method('getBudgetType')->willReturn($activityBudgetType);
+                $activity->method('isMonthlyBudget')->willReturn($activityBudgetType === 'month');
+            }
             if ($activityTimeBudget !== null) {
                 $activity->method('getTimeBudget')->willReturn($activityTimeBudget);
                 $activity->method('hasTimeBudget')->willReturn(true);
@@ -351,6 +370,10 @@ class TimesheetBudgetUsedValidatorTest extends ConstraintValidatorTestCase
             $customer = $this->createMock(Customer::class);
             $customer->method('getId')->willReturn($rawData['customer']);
             $customer->method('isMonthlyBudget')->willReturn(false);
+            if ($customerBudgetType !== null) {
+                $customer->method('getBudgetType')->willReturn($customerBudgetType);
+                $customer->method('isMonthlyBudget')->willReturn($customerBudgetType === 'month');
+            }
             if ($customerTimeBudget !== null) {
                 $customer->method('getTimeBudget')->willReturn($customerTimeBudget);
                 $customer->method('hasTimeBudget')->willReturn(true);
@@ -366,6 +389,10 @@ class TimesheetBudgetUsedValidatorTest extends ConstraintValidatorTestCase
             $project->method('getId')->willReturn($rawData['project']);
             $project->method('getCustomer')->willReturn($customer);
             $project->method('isMonthlyBudget')->willReturn(false);
+            if ($projectBudgetType !== null) {
+                $project->method('getBudgetType')->willReturn($projectBudgetType);
+                $project->method('isMonthlyBudget')->willReturn($projectBudgetType === 'month');
+            }
             if ($projectTimeBudget !== null) {
                 $project->method('getTimeBudget')->willReturn($projectTimeBudget);
                 $project->method('hasTimeBudget')->willReturn(true);
@@ -376,7 +403,6 @@ class TimesheetBudgetUsedValidatorTest extends ConstraintValidatorTestCase
                 $project->method('hasBudget')->willReturn(true);
                 $project->method('hasBudgets')->willReturn(true);
             }
-
             $timesheet = $this->createMock(Timesheet::class);
             $timesheet->method('getId')->willReturn(1);
             $timesheet->method('getRate')->willReturn($rawData['rate']);
diff --git a/translations/reporting.de.xlf b/translations/reporting.de.xlf
index 15ed4421..a77feb02 100644
--- a/translations/reporting.de.xlf
+++ b/translations/reporting.de.xlf
@@ -46,6 +46,10 @@
         <source>reporting.initial_view</source>
         <target>Initialer Bericht</target>
       </trans-unit>
+      <trans-unit id="8RaUHlW" resname="report_customer_monthly_projects">
+        <source>report_customer_monthly_projects</source>
+        <target>Projekte nach Monat, Tätigkeit und Benutzer</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>
diff --git a/translations/reporting.en.xlf b/translations/reporting.en.xlf
index 0b796312..5262ed77 100644
--- a/translations/reporting.en.xlf
+++ b/translations/reporting.en.xlf
@@ -46,6 +46,10 @@
         <source>reporting.initial_view</source>
         <target>Initial report</target>
       </trans-unit>
+      <trans-unit id="8RaUHlW" resname="report_customer_monthly_projects">
+        <source>report_customer_monthly_projects</source>
+        <target>Projects by month, activity and user</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>