diff --git a/gaehsnitz/migrations/0002_payment_estimated.py b/gaehsnitz/migrations/0002_payment_estimated.py
new file mode 100644
index 0000000..4337dac
--- /dev/null
+++ b/gaehsnitz/migrations/0002_payment_estimated.py
@@ -0,0 +1,18 @@
+# Generated by Django 4.0.6 on 2022-07-17 12:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('gaehsnitz', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='payment',
+            name='is_estimated',
+            field=models.BooleanField(default=False),
+        ),
+    ]
diff --git a/gaehsnitz/models.py b/gaehsnitz/models.py
index a3d59f5..77e9e98 100644
--- a/gaehsnitz/models.py
+++ b/gaehsnitz/models.py
@@ -17,6 +17,7 @@ class Payment(models.Model):
     amount = models.PositiveIntegerField()
     date = models.DateField()
     note = models.TextField(blank=True)
+    is_estimated = models.BooleanField(default=False)
 
     def is_incoming(self):
         return self.topic < 10