diff --git a/src/Invoice/Hydrator/BudgetHydratorTrait.php b/src/Invoice/Hydrator/BudgetHydratorTrait.php
new file mode 100644
index 00000000..ca46b67e
--- /dev/null
+++ b/src/Invoice/Hydrator/BudgetHydratorTrait.php
@@ -0,0 +1,38 @@
+<?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\Invoice\Hydrator;
+
+use App\Invoice\InvoiceModel;
+use App\Model\BudgetStatisticModel;
+
+trait BudgetHydratorTrait
+{
+    protected function getBudgetValues(string $prefix, BudgetStatisticModel $statistic, InvoiceModel $model): array
+    {
+        $formatter = $model->getFormatter();
+        $currency = $model->getCurrency();
+
+        $budgetOpen = $statistic->getBudgetOpenRelative();
+        $budgetTimeOpen = $statistic->getTimeBudgetOpenRelative();
+
+        if ($model->getTemplate()->isDecimalDuration()) {
+            $budgetOpenDuration = $formatter->getFormattedDecimalDuration($budgetTimeOpen);
+        } else {
+            $budgetOpenDuration = $formatter->getFormattedDuration($budgetTimeOpen);
+        }
+
+        return [
+            $prefix . 'budget_open' => $formatter->getFormattedMoney($budgetOpen, $currency),
+            $prefix . 'budget_open_plain' => $budgetOpen,
+            $prefix . 'time_budget_open' => $budgetOpenDuration,
+            $prefix . 'time_budget_open_plain' => $budgetTimeOpen,
+        ];
+    }
+}
diff --git a/src/Invoice/Hydrator/InvoiceModelActivityHydrator.php b/src/Invoice/Hydrator/InvoiceModelActivityHydrator.php
index 97d8194c..9f9c5b5f 100644
--- a/src/Invoice/Hydrator/InvoiceModelActivityHydrator.php
+++ b/src/Invoice/Hydrator/InvoiceModelActivityHydrator.php
@@ -16,6 +16,8 @@ use App\Invoice\InvoiceModelHydrator;
 
 class InvoiceModelActivityHydrator implements InvoiceModelHydrator
 {
+    use BudgetHydratorTrait;
+
     private $activityStatistic;
 
     public function __construct(ActivityStatisticService $activityStatistic)
@@ -59,21 +61,8 @@ class InvoiceModelActivityHydrator implements InvoiceModelHydrator
         ];
 
         $statistic = $this->activityStatistic->getBudgetStatisticModel($activity, $model->getQuery()->getEnd());
-        $formatter = $model->getFormatter();
-        $currency = $model->getCurrency();
 
-        if ($model->getTemplate()->isDecimalDuration()) {
-            $budgetOpenDuration = $formatter->getFormattedDecimalDuration($statistic->getTimeBudgetOpen());
-        } else {
-            $budgetOpenDuration = $formatter->getFormattedDuration($statistic->getTimeBudgetOpen());
-        }
-
-        $values = array_merge($values, [
-            $prefix . 'budget_open' => $formatter->getFormattedMoney($statistic->getBudgetOpen(), $currency),
-            $prefix . 'budget_open_plain' => $statistic->getBudgetOpen(),
-            $prefix . 'time_budget_open' => $budgetOpenDuration,
-            $prefix . 'time_budget_open_plain' => $statistic->getTimeBudgetOpen(),
-        ]);
+        $values = array_merge($values, $this->getBudgetValues($prefix, $statistic, $model));
 
         foreach ($activity->getVisibleMetaFields() as $metaField) {
             $values = array_merge($values, [
diff --git a/src/Invoice/Hydrator/InvoiceModelCustomerHydrator.php b/src/Invoice/Hydrator/InvoiceModelCustomerHydrator.php
index d9c49293..e1117226 100644
--- a/src/Invoice/Hydrator/InvoiceModelCustomerHydrator.php
+++ b/src/Invoice/Hydrator/InvoiceModelCustomerHydrator.php
@@ -15,6 +15,8 @@ use App\Invoice\InvoiceModelHydrator;
 
 class InvoiceModelCustomerHydrator implements InvoiceModelHydrator
 {
+    use BudgetHydratorTrait;
+
     private $customerStatistic;
 
     public function __construct(CustomerStatisticService $customerStatistic)
@@ -48,21 +50,8 @@ class InvoiceModelCustomerHydrator implements InvoiceModelHydrator
         ];
 
         $statistic = $this->customerStatistic->getBudgetStatisticModel($customer, $model->getQuery()->getEnd());
-        $currency = $model->getCurrency();
-        $formatter = $model->getFormatter();
 
-        if ($model->getTemplate()->isDecimalDuration()) {
-            $budgetOpenDuration = $formatter->getFormattedDecimalDuration($statistic->getTimeBudgetOpen());
-        } else {
-            $budgetOpenDuration = $formatter->getFormattedDuration($statistic->getTimeBudgetOpen());
-        }
-
-        $values = array_merge($values, [
-            'customer.budget_open' => $formatter->getFormattedMoney($statistic->getBudgetOpen(), $currency),
-            'customer.budget_open_plain' => $statistic->getBudgetOpen(),
-            'customer.time_budget_open' => $budgetOpenDuration,
-            'customer.time_budget_open_plain' => $statistic->getTimeBudgetOpen(),
-        ]);
+        $values = array_merge($values, $this->getBudgetValues('customer.', $statistic, $model));
 
         foreach ($customer->getMetaFields() as $metaField) {
             $values = array_merge($values, [
diff --git a/src/Invoice/Hydrator/InvoiceModelProjectHydrator.php b/src/Invoice/Hydrator/InvoiceModelProjectHydrator.php
index 2e18a367..08c04736 100644
--- a/src/Invoice/Hydrator/InvoiceModelProjectHydrator.php
+++ b/src/Invoice/Hydrator/InvoiceModelProjectHydrator.php
@@ -16,6 +16,8 @@ use App\Project\ProjectStatisticService;
 
 class InvoiceModelProjectHydrator implements InvoiceModelHydrator
 {
+    use BudgetHydratorTrait;
+
     private $projectStatistic;
 
     public function __construct(ProjectStatisticService $projectStatistic)
@@ -73,18 +75,7 @@ class InvoiceModelProjectHydrator implements InvoiceModelHydrator
 
         $statistic = $this->projectStatistic->getBudgetStatisticModel($project, $model->getQuery()->getEnd());
 
-        if ($model->getTemplate()->isDecimalDuration()) {
-            $budgetOpenDuration = $formatter->getFormattedDecimalDuration($statistic->getTimeBudgetOpen());
-        } else {
-            $budgetOpenDuration = $formatter->getFormattedDuration($statistic->getTimeBudgetOpen());
-        }
-
-        $values = array_merge($values, [
-            $prefix . 'budget_open' => $formatter->getFormattedMoney($statistic->getBudgetOpen(), $currency),
-            $prefix . 'budget_open_plain' => $statistic->getBudgetOpen(),
-            $prefix . 'time_budget_open' => $budgetOpenDuration,
-            $prefix . 'time_budget_open_plain' => $statistic->getTimeBudgetOpen(),
-        ]);
+        $values = array_merge($values, $this->getBudgetValues($prefix, $statistic, $model));
 
         foreach ($project->getVisibleMetaFields() as $metaField) {
             $values = array_merge($values, [
diff --git a/src/Invoice/InvoiceModel.php b/src/Invoice/InvoiceModel.php
index 769c7176..26838b48 100644
--- a/src/Invoice/InvoiceModel.php
+++ b/src/Invoice/InvoiceModel.php
@@ -78,6 +78,9 @@ final class InvoiceModel
      */
     private $invoiceNumber;
 
+    /**
+     * @internal use InvoiceModelFactory
+     */
     public function __construct(InvoiceFormatter $formatter, CustomerStatisticService $customerStatistic, ProjectStatisticService $projectStatistic, ActivityStatisticService $activityStatistic)
     {
         $this->invoiceDate = new \DateTime();
diff --git a/src/Model/BudgetStatisticModel.php b/src/Model/BudgetStatisticModel.php
index 70d81cb7..06b952ec 100644
--- a/src/Model/BudgetStatisticModel.php
+++ b/src/Model/BudgetStatisticModel.php
@@ -80,13 +80,23 @@ class BudgetStatisticModel implements BudgetStatisticModelInterface
     public function getDurationBillable(): int
     {
         if ($this->isMonthlyBudget()) {
-            if ($this->statistic === null) {
-                return 0;
-            }
-
-            return $this->statistic->getDurationBillable();
+            return $this->getDurationBillableRelative();
         }
 
+        return $this->getDurationBillableTotal();
+    }
+
+    public function getDurationBillableRelative(): int
+    {
+        if ($this->statistic === null) {
+            return 0;
+        }
+
+        return $this->statistic->getDurationBillable();
+    }
+
+    public function getDurationBillableTotal(): int
+    {
         if ($this->statisticTotal === null) {
             return 0;
         }
@@ -96,7 +106,14 @@ class BudgetStatisticModel implements BudgetStatisticModelInterface
 
     public function getTimeBudgetOpen(): int
     {
-        $value = $this->getTimeBudget() - $this->getTimeBudgetSpent();
+        $value = $this->getTimeBudget() - $this->getDurationBillable();
+
+        return $value > 0 ? $value : 0;
+    }
+
+    public function getTimeBudgetOpenRelative(): int
+    {
+        $value = $this->getTimeBudget() - $this->getDurationBillableRelative();
 
         return $value > 0 ? $value : 0;
     }
@@ -118,7 +135,14 @@ class BudgetStatisticModel implements BudgetStatisticModelInterface
 
     public function getBudgetOpen(): float
     {
-        $value = $this->getBudget() - $this->getBudgetSpent();
+        $value = $this->getBudget() - $this->getRateBillable();
+
+        return $value > 0 ? $value : 0;
+    }
+
+    public function getBudgetOpenRelative(): float
+    {
+        $value = $this->getBudget() - $this->getRateBillableRelative();
 
         return $value > 0 ? $value : 0;
     }
@@ -131,13 +155,23 @@ class BudgetStatisticModel implements BudgetStatisticModelInterface
     public function getRateBillable(): float
     {
         if ($this->isMonthlyBudget()) {
-            if ($this->statistic === null) {
-                return 0.00;
-            }
-
-            return $this->statistic->getRateBillable();
+            return $this->getRateBillableRelative();
         }
 
+        return $this->getRateBillableTotal();
+    }
+
+    public function getRateBillableRelative(): float
+    {
+        if ($this->statistic === null) {
+            return 0.00;
+        }
+
+        return $this->statistic->getRateBillable();
+    }
+
+    public function getRateBillableTotal(): float
+    {
         if ($this->statisticTotal === null) {
             return 0.00;
         }
diff --git a/tests/Model/BudgetStatisticModelTest.php b/tests/Model/BudgetStatisticModelTest.php
index 83967237..634d431d 100644
--- a/tests/Model/BudgetStatisticModelTest.php
+++ b/tests/Model/BudgetStatisticModelTest.php
@@ -71,8 +71,12 @@ class BudgetStatisticModelTest extends TestCase
 
         self::assertSame($entity, $sut->getEntity());
         self::assertSame(23, $sut->getDurationBillable());
+        self::assertSame(23, $sut->getDurationBillableRelative());
+        self::assertSame(223, $sut->getDurationBillableTotal());
         self::assertSame(53, $sut->getDuration());
         self::assertSame(13.00, $sut->getRateBillable());
+        self::assertSame(13.00, $sut->getRateBillableRelative());
+        self::assertSame(213.00, $sut->getRateBillableTotal());
         self::assertSame(47.00, $sut->getRate());
         self::assertSame(147.95, $sut->getInternalRate());