diff --git a/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php b/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php
index f0fb94ab..ba051c71 100644
--- a/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php
+++ b/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php
@@ -116,10 +116,12 @@ class ClockifyTimeEntriesImporter extends DefaultImporter
                     throw new ImportException('Time entry description is too long');
                 }
                 $timeEntry->description = $record['Description'];
-                if (! in_array($record['Billable'], ['Yes', 'No'], true)) {
-                    throw new ImportException('Invalid billable value');
+                if (isset($record['Billable'])) {
+                    if (! in_array($record['Billable'], ['Yes', 'No'], true)) {
+                        throw new ImportException('Invalid billable value');
+                    }
+                    $timeEntry->billable = $record['Billable'] === 'Yes';
                 }
-                $timeEntry->billable = $record['Billable'] === 'Yes';
                 $timeEntry->tags = $this->getTags($record['Tags']);
                 $timeEntry->is_imported = true;
 
@@ -219,7 +221,6 @@ class ClockifyTimeEntriesImporter extends DefaultImporter
             'Group',
             'Email',
             'Tags',
-            'Billable',
             'Start Date',
             'Start Time',
             'End Date',
diff --git a/resources/testfiles/clockify_time_entries_import_test_4.csv b/resources/testfiles/clockify_time_entries_import_test_4.csv
new file mode 100644
index 00000000..f5456521
--- /dev/null
+++ b/resources/testfiles/clockify_time_entries_import_test_4.csv
@@ -0,0 +1,3 @@
+"Project","Client","Description","Task","User","Group","Email","Tags","Start Date","Start Time","End Date","End Time","Duration (h)","Duration (decimal)","Billable Rate (USD)","Billable Amount (USD)"
+"Project without Client","","","","Peter Tester","","peter.test@email.test","Development, Backend","03/04/2024","10:23:52 AM","03/04/2024","10:23:52 AM","00:00:00","0.00","0.00","0.00"
+"Project for Big Company","Big Company","Working hard","Task 1","Peter Tester","","peter.test@email.test","","03/04/2024","10:23 AM","03/04/2024","11:23:01 AM","01:00:01","0.00","0.00","0.00"
diff --git a/tests/Unit/Service/Import/Importers/ClockifyTimeEntriesImporterTest.php b/tests/Unit/Service/Import/Importers/ClockifyTimeEntriesImporterTest.php
index 4d0bcd4e..9712b909 100644
--- a/tests/Unit/Service/Import/Importers/ClockifyTimeEntriesImporterTest.php
+++ b/tests/Unit/Service/Import/Importers/ClockifyTimeEntriesImporterTest.php
@@ -41,6 +41,30 @@ class ClockifyTimeEntriesImporterTest extends ImporterTestAbstract
         $this->assertSame(1, $report->clientsCreated);
     }
 
+    public function test_import_of_test_file_without_billable_works_and_defaults_to_non_billable(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $timezone = 'Europe/Vienna';
+        $importer = new ClockifyTimeEntriesImporter;
+        $importer->init($organization);
+        $data = Storage::disk('testfiles')->get('clockify_time_entries_import_test_4.csv');
+
+        // Act
+        $importer->importData($data, $timezone);
+        $report = $importer->getReport();
+
+        // Assert
+        $testScenario = $this->checkTestScenarioAfterImportExcludingTimeEntries(false, true);
+        $this->checkTimeEntries($testScenario, false, true);
+        $this->assertSame(2, $report->timeEntriesCreated);
+        $this->assertSame(2, $report->tagsCreated);
+        $this->assertSame(1, $report->tasksCreated);
+        $this->assertSame(1, $report->usersCreated);
+        $this->assertSame(2, $report->projectsCreated);
+        $this->assertSame(1, $report->clientsCreated);
+    }
+
     public function test_import_of_test_with_special_characters_description_succeeds(): void
     {
         // Arrange
diff --git a/tests/Unit/Service/Import/Importers/ImporterTestAbstract.php b/tests/Unit/Service/Import/Importers/ImporterTestAbstract.php
index 294254b9..e03082f2 100644
--- a/tests/Unit/Service/Import/Importers/ImporterTestAbstract.php
+++ b/tests/Unit/Service/Import/Importers/ImporterTestAbstract.php
@@ -26,7 +26,7 @@ class ImporterTestAbstract extends TestCase
     /**
      * @return object{user1: User, project1: Project, project2: Project, tag1: Tag, tag2: Tag}
      */
-    protected function checkTestScenarioAfterImportExcludingTimeEntries(bool $detailed = false): object
+    protected function checkTestScenarioAfterImportExcludingTimeEntries(bool $detailed = false, bool $billableDefault = false): object
     {
         $users = User::all();
         $this->assertCount(2, $users);
@@ -80,12 +80,12 @@ class ImporterTestAbstract extends TestCase
             $this->assertSame('#ef5350', $project1->color);
             $this->assertSame(null, $project1->billable_rate);
             // Project for Big Company
-            $this->assertSame(true, $project2->is_billable);
+            $this->assertSame(! $billableDefault, $project2->is_billable);
             $this->assertSame(false, $project2->is_public);
             $this->assertSame('#ec407a', $project2->color);
             $this->assertSame(10001, $project2->billable_rate);
             // Project (Archived)
-            $this->assertSame(true, $project3->is_billable);
+            $this->assertSame(! $billableDefault, $project3->is_billable);
             $this->assertSame(true, $project3->is_public);
             $this->assertSame('#6a407f', $project3->color);
             $this->assertSame(null, $project3->billable_rate);
@@ -176,7 +176,7 @@ class ImporterTestAbstract extends TestCase
     /**
      * @param  object{user1: User, project1: Project, project2: Project, tag1: Tag, tag2: Tag}  $testScenario
      */
-    protected function checkTimeEntries(object $testScenario, bool $secondRun = false): void
+    protected function checkTimeEntries(object $testScenario, bool $secondRun = false, bool $billableDefault = false): void
     {
         $timeEntries = TimeEntry::all();
         if ($secondRun) {
@@ -197,7 +197,7 @@ class ImporterTestAbstract extends TestCase
         $this->assertSame('Working hard', $timeEntry2->description);
         $this->assertSame('2024-03-04 09:23:00', $timeEntry2->start->toDateTimeString());
         $this->assertSame('2024-03-04 10:23:01', $timeEntry2->end->toDateTimeString());
-        $this->assertTrue($timeEntry2->billable);
+        $this->assertSame(! $billableDefault, $timeEntry2->billable);
         $this->assertTrue($timeEntry2->is_imported);
         $this->assertSame([], $timeEntry2->tags);
     }