diff --git a/src/components/03_customer-management/AboutComponent.vue b/src/components/03_customer-management/AboutComponent.vue
index 27772208..14566ce2 100644
--- a/src/components/03_customer-management/AboutComponent.vue
+++ b/src/components/03_customer-management/AboutComponent.vue
@@ -139,6 +139,11 @@ const branchNo = defineModel<number>('branchNo');
         class="col-6"
         :label="$t('taxNo')"
         v-model="taxNo"
+          :rules="[
+        (val) =>
+          (val && val.length === 13 && /[0-9]+/.test(val)) ||
+          $t('formDialogInputTaxNoValidate'),
+      ]"
       />
       <q-input
         for="input-registerName"
diff --git a/src/components/03_customer-management/BasicInformation.vue b/src/components/03_customer-management/BasicInformation.vue
index 72772e6c..91ac3f8f 100644
--- a/src/components/03_customer-management/BasicInformation.vue
+++ b/src/components/03_customer-management/BasicInformation.vue
@@ -89,6 +89,11 @@ onMounted(async () => {});
       class="col-6"
       :label="$t('taxNo')"
       v-model="taxNo"
+        :rules="[
+        (val) =>
+          (val && val.length === 13 && /[0-9]+/.test(val)) ||
+          $t('formDialogInputTaxNoValidate'),
+      ]"
     />
 
     <q-input
diff --git a/src/components/03_customer-management/FormEmployeePassport.vue b/src/components/03_customer-management/FormEmployeePassport.vue
index 11d1e864..f9493dfc 100644
--- a/src/components/03_customer-management/FormEmployeePassport.vue
+++ b/src/components/03_customer-management/FormEmployeePassport.vue
@@ -73,10 +73,7 @@ defineProps<{
       class="col-6"
       :label="$t('formDialogInputPassportRef')"
       v-model="previousPassportReference"
-      :rules="[
-        (val: string) =>
-          !!val || $t('inputValidate') + $t('formDialogInputPassportRef'),
-      ]"
+  
     />
     <q-input
       for="input-passport-place"