diff --git a/FO/Controllers/FOBaseController.cs b/FO/Controllers/FOBaseController.cs
index 25c2440..417d94f 100644
--- a/FO/Controllers/FOBaseController.cs
+++ b/FO/Controllers/FOBaseController.cs
@@ -681,7 +681,7 @@ namespace NP.FO.Controllers
                                                     payTax.manname = vm.PPLog.mname;
                                                     payTax.telno = vm.PPLog.mphone;
                                                     payTax.email = vm.PPLog.taxemail;
-                                                    payTax.isreceipt = vm.PPLog.isreceipt; //0:청구, 1:영수
+                                                    payTax.isreceipt = vm.PPLog.isreceipt.Value; //0:청구, 1:영수
                                                     payTax.taxdatereq = vm.PPLog.taxdatereq;
                                                     payTax.brno = (payTax.brno ?? "").Replace("-", "");
                                                     payTax.grno = (payTax.grno ?? "").Replace("-", ""); 
diff --git a/FO/Views/Course/ApplyPay.cshtml b/FO/Views/Course/ApplyPay.cshtml
index eb9fea6..385fe53 100644
--- a/FO/Views/Course/ApplyPay.cshtml
+++ b/FO/Views/Course/ApplyPay.cshtml
@@ -107,8 +107,8 @@
             } 
         </ul>
         <ul class="apyRdo" id="taxinvoice_option" style="display:none;margin-top:-1px">
-            <li><input type="radio" name="isreceipt" id="isreceipt0" value="0" @(Model.PPLog.isreceipt == 0 ? "checked" : "") /><label for="isreceipt0"> 청구</label></li>
-            <li><input type="radio" name="isreceipt" id="isreceipt1" value="1" @(Model.PPLog.isreceipt != 0 ? "checked" : "")/><label for="isreceipt1"> 영수</label></li>
+            <li><input type="radio" name="isreceipt" id="isreceipt1" value="1" @(Model.PPLog.isreceipt == null ? "checked" : Model.PPLog.isreceipt == 1 ? "checked" : "")/><label for="isreceipt1"> 영수</label></li>
+            <li><input type="radio" name="isreceipt" id="isreceipt0" value="0" @(Model.PPLog.isreceipt == 0 ? "checked" : "") /><label for="isreceipt0"> 청구</label></li>            
             <li style="vertical-align:sub;">발행요청일 : <input type="text" name="taxdatereq" id="taxdatereq" data-date-format="yyyy-mm-dd" class="datepicker-input" value="@(Model.PPLog.taxdatereq == null ? "" : Model.PPLog.taxdatereq.Value.ToString("yyyy-MM-dd"))" autocomplete="off" /></li>
         </ul>
     </div>
diff --git a/Model/PPLog.cs b/Model/PPLog.cs
index 38b9aba..a9c7aab 100644
--- a/Model/PPLog.cs
+++ b/Model/PPLog.cs
@@ -66,7 +66,7 @@ namespace NP.Model
         /// <summary>
         /// 영수,청구구분	0:청구, 1:영수
         /// </summary>
-        public int isreceipt { get; set; }
+        public int? isreceipt { get; set; }
         /// <summary>
         /// 발행요청일
         /// </summary>