diff --git a/store/models.py b/store/models.py
index a638ea4..90f4d0c 100644
--- a/store/models.py
+++ b/store/models.py
@@ -459,14 +459,14 @@ class Checklist(models.Model):
         if self.price_snapshot_id:
             return self.price_snapshot.commission_rub
 
-        commission = (self.price_rub * Decimal(settings.COMMISSION_OVER_150K)
-                      if self.price_rub > 150_000
-                      else GlobalSettings.load().commission_rub)
-
-        # Add commission of bottom-most category
-        if self.category_id:
+        if self.price_rub > 150_000:
+            commission = self.price_rub * Decimal(settings.COMMISSION_OVER_150K)
+        elif self.category_id:
+            # Add commission of bottom-most category
             category_commission = getattr(self.category, 'commission', 0)
-            commission += category_commission * self.price_rub / 100
+            commission = self.price_rub / 100 * category_commission
+        else:
+            commission = GlobalSettings.load().commission_rub
 
         return commission