diff --git a/app/services/pricing_engine.py b/app/services/pricing_engine.py
index 499da965..a546484f 100644
--- a/app/services/pricing_engine.py
+++ b/app/services/pricing_engine.py
@@ -603,6 +603,9 @@ class PricingEngine:
         period_pct = 0
         devices_pct = 0
         promo_group = self.resolve_promo_group(user)
+        # Only apply promo group discount if the tariff is available for this group
+        if promo_group is not None and not tariff.is_available_for_promo_group(promo_group.id):
+            promo_group = None
         if promo_group is not None:
             period_pct = promo_group.get_discount_percent('period', period_days)
             devices_pct = promo_group.get_discount_percent('devices', period_days)