diff --git a/app/database/models.py b/app/database/models.py
index bdf8e544..1b7a7123 100644
--- a/app/database/models.py
+++ b/app/database/models.py
@@ -541,7 +541,11 @@ class PromoGroup(Base):
             "traffic": self.traffic_discount_percent,
             "devices": self.device_discount_percent,
         }
-        percent = mapping.get(category, 0)
+        percent = mapping.get(category) or 0
+
+        if percent == 0 and self.is_default:
+            base_period_discount = self._get_period_discount(period_days)
+            percent = max(percent, base_period_discount)
 
         return max(0, min(100, percent))
 
diff --git a/app/utils/price_display.py b/app/utils/price_display.py
index 5d0b3add..06747be5 100644
--- a/app/utils/price_display.py
+++ b/app/utils/price_display.py
@@ -72,11 +72,8 @@ def calculate_user_price(
         # Get user's promo group discount for this category
         discount_percent = user.get_promo_discount(category, period_days)
     else:
-        # For None user, use base settings discount (only for period category)
-        if category == "period":
-            discount_percent = settings.get_base_promo_group_period_discount(period_days)
-        else:
-            discount_percent = 0
+        # For None user, use base settings discount
+        discount_percent = settings.get_base_promo_group_period_discount(period_days)
 
     logger.debug(
         f"calculate_user_price: user={user.telegram_id if user else 'None'}, "
diff --git a/tests/test_promo_group_base_discounts.py b/tests/test_promo_group_base_discounts.py
new file mode 100644
index 00000000..1243b404
--- /dev/null
+++ b/tests/test_promo_group_base_discounts.py
@@ -0,0 +1,29 @@
+import pytest
+
+from app.config import settings
+from app.database.models import PromoGroup
+
+
+@pytest.fixture
+def base_discount_settings(monkeypatch):
+    monkeypatch.setattr(settings, "BASE_PROMO_GROUP_PERIOD_DISCOUNTS_ENABLED", True)
+    monkeypatch.setattr(settings, "BASE_PROMO_GROUP_PERIOD_DISCOUNTS", "60:15")
+    yield
+
+
+def test_base_promo_discount_applies_to_all_categories(base_discount_settings):
+    promo_group = PromoGroup(name="Default", is_default=True)
+
+    assert promo_group.get_discount_percent("period", 60) == 15
+    assert promo_group.get_discount_percent("servers", 60) == 15
+    assert promo_group.get_discount_percent("traffic", 60) == 15
+    assert promo_group.get_discount_percent("devices", 60) == 15
+
+
+def test_specific_category_discount_overrides_base(base_discount_settings):
+    promo_group = PromoGroup(
+        name="Default", is_default=True, server_discount_percent=5
+    )
+
+    assert promo_group.get_discount_percent("servers", 60) == 5
+    assert promo_group.get_discount_percent("devices", 60) == 15