diff --git a/app/models/services/checkbook_services/plan_comparision.rb b/app/models/services/checkbook_services/plan_comparision.rb
index d9ce65561b9..d17a0ca8df6 100644
--- a/app/models/services/checkbook_services/plan_comparision.rb
+++ b/app/models/services/checkbook_services/plan_comparision.rb
@@ -124,7 +124,7 @@ def construct_body_ivl
 
       def extra_ivl_body
         fields = {
-          "coverageStartDate": @hbx_enrollment.effective_on&.strftime("%m-%d-%Y")
+          "enrollmentDate": @hbx_enrollment.effective_on&.strftime("%m/%d/%Y")
         }
         current_plan = build_current_plan(@hbx_enrollment)
         fields[:currentPlan] = current_plan if current_plan.present?