diff --git a/core/apps/finance/migrations/0017_alter_expence_project_folder_alter_income_date_and_more.py b/core/apps/finance/migrations/0017_alter_expence_project_folder_alter_income_date_and_more.py
new file mode 100644
index 0000000..b2f5d13
--- /dev/null
+++ b/core/apps/finance/migrations/0017_alter_expence_project_folder_alter_income_date_and_more.py
@@ -0,0 +1,30 @@
+# Generated by Django 5.2.4 on 2025-09-10 14:00
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('finance', '0016_alter_income_exchange_rate'),
+        ('projects', '0016_estimatework_employee_estimatework_end_date_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='expence',
+            name='project_folder',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='expences', to='projects.projectfolder'),
+        ),
+        migrations.AlterField(
+            model_name='income',
+            name='date',
+            field=models.DateField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name='income',
+            name='project_folder',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='incomes', to='projects.projectfolder'),
+        ),
+    ]
diff --git a/core/apps/finance/models/expence.py b/core/apps/finance/models/expence.py
index 93b194d..0dff0bd 100644
--- a/core/apps/finance/models/expence.py
+++ b/core/apps/finance/models/expence.py
@@ -9,7 +9,7 @@ class Expence(BaseModel):
     cash_transaction = models.ForeignKey(CashTransaction, on_delete=models.CASCADE, related_name='expences')
     payment_type = models.ForeignKey(PaymentType, on_delete=models.CASCADE, related_name='expences')
     project_folder = models.ForeignKey(
-        'projects.ProjectFolder', on_delete=models.CASCADE, related_name='expences'
+        'projects.ProjectFolder', on_delete=models.SET_NULL, related_name='expences', null=True, blank=True
     )
     project = models.ForeignKey(
         'projects.Project', on_delete=models.SET_NULL, null=True, related_name='expences', blank=True
diff --git a/core/apps/finance/models/income.py b/core/apps/finance/models/income.py
index 311f30b..d276ca7 100644
--- a/core/apps/finance/models/income.py
+++ b/core/apps/finance/models/income.py
@@ -11,7 +11,7 @@ class Income(BaseModel):
     )
     payment_type = models.ForeignKey(PaymentType, on_delete=models.CASCADE, related_name='incomes')
     project_folder = models.ForeignKey(
-        'projects.ProjectFolder', on_delete=models.CASCADE, related_name='incomes'
+        'projects.ProjectFolder', on_delete=models.SET_NULL, related_name='incomes', null=True, blank=True
     )
     project = models.ForeignKey(
         'projects.Project', on_delete=models.SET_NULL, related_name='incomes', null=True, blank=True
diff --git a/core/apps/finance/serializers/expence.py b/core/apps/finance/serializers/expence.py
index 00c1ec8..decf08b 100644
--- a/core/apps/finance/serializers/expence.py
+++ b/core/apps/finance/serializers/expence.py
@@ -105,7 +105,7 @@ class ExpenceListSerializer(serializers.ModelSerializer):
         return {
             'id': obj.project_folder.id,
             'name': obj.project_folder.name
-        }
+        } if obj.project_folder else None
     
     def get_project(self, obj):
         return {
diff --git a/core/apps/finance/serializers/income.py b/core/apps/finance/serializers/income.py
index 7e544b0..9f29d5b 100644
--- a/core/apps/finance/serializers/income.py
+++ b/core/apps/finance/serializers/income.py
@@ -37,7 +37,7 @@ class IncomeListSerializer(serializers.ModelSerializer):
         return {
             'id': obj.project_folder.id,
             'name': obj.project_folder.name
-        }
+        } if obj.project_folder else None
     
     def get_project(self, obj):
         return {
@@ -72,7 +72,7 @@ class IncomeCreateSerializer(serializers.ModelSerializer):
             income = Income.objects.create(
                 cash_transaction=validated_data['cash_transaction'],
                 payment_type=validated_data['payment_type'],
-                project_folder=validated_data['project_folder'],
+                project_folder=validated_data.get('project_folder'),
                 project=validated_data.get('project'),
                 counterparty=validated_data.get('counterparty'),
                 type_income=validated_data.get('type_income'),