diff --git a/uncloud/uncloud_pay/models.py b/uncloud/uncloud_pay/models.py
index 8964cb3..24cc858 100644
--- a/uncloud/uncloud_pay/models.py
+++ b/uncloud/uncloud_pay/models.py
@@ -167,22 +167,25 @@ class BillRecord():
                     self.bill.starting_date.year,
                     self.bill.starting_date.month)
             adjusted_recurring_price = self.recurring_price / days_in_month
-            recurring_price = adjusted_recurring_price * days
-
-            return self.recurring_price # TODO
+            amount = adjusted_recurring_price * days
         elif self.recurring_period == RecurringPeriod.PER_DAY:
             days = ceil(billed_delta / timedelta(days=1))
-            return self.recurring_price * days
+            amount = self.recurring_price * days
         elif self.recurring_period == RecurringPeriod.PER_HOUR:
             hours = ceil(billed_delta / timedelta(hours=1))
-            return self.recurring_price * hours
+            amount = self.recurring_price * hours
         elif self.recurring_period == RecurringPeriod.PER_SECOND:
             seconds = ceil(billed_delta / timedelta(seconds=1))
-            return self.recurring_price * seconds
+            amount = self.recurring_price * seconds
         else:
             raise Exception('Unsupported recurring period: {}.'.
                     format(record.recurring_period))
 
+        if self.order.starting_date > self.bill.starting_date:
+            amount += self.setup_fee
+
+        return amount
+
 ###
 # Orders.
 
diff --git a/uncloud/uncloud_pay/serializers.py b/uncloud/uncloud_pay/serializers.py
index 6e4b2d3..fcbaf73 100644
--- a/uncloud/uncloud_pay/serializers.py
+++ b/uncloud/uncloud_pay/serializers.py
@@ -96,6 +96,7 @@ class BillRecordSerializer(serializers.Serializer):
     description = serializers.CharField()
     recurring_period = serializers.CharField()
     recurring_price = serializers.DecimalField(max_digits=10, decimal_places=2)
+    setup_fee = serializers.DecimalField(max_digits=10, decimal_places=2)
     amount = serializers.DecimalField(max_digits=10, decimal_places=2)
 
 class BillSerializer(serializers.ModelSerializer):