diff --git a/apps/payment/models.py b/apps/payment/models.py
index 5644eb7e..25aa9e79 100644
--- a/apps/payment/models.py
+++ b/apps/payment/models.py
@@ -136,7 +136,7 @@ class Payment(PolymorphicModel):
         if is_camp:
             if date_start < camp_start:
                 date_start = camp_start
-            if date_start.month == 6 and date_start.day > 15:
+            if date_start.month == 6 and date_start.day > 16:
                 date_start = date_start.replace(month=7, day=1)
         elif school_end < date_start < school_start:
             date_start = school_start