diff --git a/loopback/util/validateIban.js b/loopback/util/validateIban.js
index ed3e004260..2386538b5c 100644
--- a/loopback/util/validateIban.js
+++ b/loopback/util/validateIban.js
@@ -3,7 +3,6 @@ module.exports = function(iban, countryCode) {
     if (typeof iban != 'string') return false;
     if (countryCode?.toLowerCase() != 'es') return true;
 
-    iban = iban.toUpperCase();
     iban = trim(iban);
     iban = iban.replace(/\s/g, '');
 
diff --git a/modules/client/front/billing-data/index.html b/modules/client/front/billing-data/index.html
index bd4f86d1c2..39c0fc4285 100644
--- a/modules/client/front/billing-data/index.html
+++ b/modules/client/front/billing-data/index.html
@@ -33,6 +33,7 @@
         <vn-horizontal>
             <vn-textfield
                 label="IBAN"
+                ng-keyup="$ctrl.client.iban = $ctrl.client.iban.toUpperCase()"
                 ng-model="$ctrl.client.iban"
                 rule
                 on-change="$ctrl.autofillBic()"