diff --git a/backend/igny8_core/business/billing/models.py b/backend/igny8_core/business/billing/models.py
index 0ab721da..bd5f9657 100644
--- a/backend/igny8_core/business/billing/models.py
+++ b/backend/igny8_core/business/billing/models.py
@@ -180,13 +180,6 @@ class Invoice(AccountBaseModel):
     ]
     
     invoice_number = models.CharField(max_length=50, unique=True, db_index=True)
-    subscription = models.ForeignKey(
-        'igny8_core_auth.Subscription',
-        null=True,
-        blank=True,
-        on_delete=models.SET_NULL,
-        related_name='invoices'
-    )
     
     # Amounts
     subtotal = models.DecimalField(max_digits=10, decimal_places=2, default=0)