diff --git a/services/loopback/common/validations/specs/validateIban.spec.js b/services/loopback/common/validations/specs/validateIban.spec.js
new file mode 100644
index 000000000..a5d08d4c4
--- /dev/null
+++ b/services/loopback/common/validations/specs/validateIban.spec.js
@@ -0,0 +1,21 @@
+const validateIban = require('../validateIban');
+
+describe('IBAN validation', () => {
+    it('should return false for non-IBAN input', () => {
+        let isValid = validateIban('Pepinillos');
+
+        expect(isValid).toBeFalsy();
+    });
+
+    it('should return false for invalid spanish IBAN input', () => {
+        let isValid = validateIban('ES00 9999 0000 9999 0000 9999');
+
+        expect(isValid).toBeFalsy();
+    });
+
+    it('should return true for valid spanish IBAN', () => {
+        let isValid = validateIban('ES91 2100 0418 4502 0005 1332');
+
+        expect(isValid).toBeTruthy();
+    });
+});
diff --git a/services/loopback/common/validations/validateIban.js b/services/loopback/common/validations/validateIban.js
index 2e8883642..3ca09ef95 100644
--- a/services/loopback/common/validations/validateIban.js
+++ b/services/loopback/common/validations/validateIban.js
@@ -6,44 +6,41 @@ module.exports = function(iban) {
     iban = trim(iban);
     iban = iban.replace(/\s/g, '');
 
-    if (iban.length != 24) {
+    if (iban.length != 24)
         return false;
-    }
 
     // Se coge las primeras dos letras y se pasan a números
-    var letter1 = iban.substring(0, 1);
-    var letter2 = iban.substring(1, 2);
-    var num1 = getIbanNumber(letter1);
-    var num2 = getIbanNumber(letter2);
+    let letter1 = iban.substring(0, 1);
+    let letter2 = iban.substring(1, 2);
+    let num1 = getIbanNumber(letter1);
+    let num2 = getIbanNumber(letter2);
 
     // Se sustituye las letras por números.
-    var isbanaux = String(num1) + String(num2) + iban.substring(2);
+    let isbanaux = String(num1) + String(num2) + iban.substring(2);
 
     // Se mueve los 6 primeros caracteres al final de la cadena.
     isbanaux = isbanaux.substring(6) + isbanaux.substring(0, 6);
 
     // Se calcula el resto, llamando a la función module97, definida más abajo
-    var resto = module97(isbanaux);
+    let resto = module97(isbanaux);
 
-    if (resto == 1) {
+    if (resto == 1)
         return true;
-    }
 
     return false;
 
     function module97(iban) {
-        var parts = Math.ceil(iban.length / 7);
-        var remainer = '';
+        let parts = Math.ceil(iban.length / 7);
+        let remainer = '';
 
-        for (var i = 1; i <= parts; i++) {
+        for (let i = 1; i <= parts; i++)
             remainer = String(parseFloat(remainer + iban.substr((i - 1) * 7, 7)) % 97);
-        }
 
         return remainer;
     }
 
     function getIbanNumber(letra) {
-        var letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+        let letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
         return letters.search(letra) + 10;
     }