diff --git a/app/Validation/Account/DepositValidation.php b/app/Validation/Account/DepositValidation.php
index 630a19cecd..080dc490aa 100644
--- a/app/Validation/Account/DepositValidation.php
+++ b/app/Validation/Account/DepositValidation.php
@@ -122,6 +122,16 @@ trait DepositValidation
             $result            = false;
         }
 
+        // if there is an iban, it can only be in use by a revenue account or we will fail.
+        if(null !== $accountIban && '' !== $accountIban) {
+            app('log')->debug('Check if there is not already an account with this IBAN');
+            $existing = $this->findExistingAccount([AccountType::ASSET, AccountType::LOAN, AccountType::DEBT, AccountType::MORTGAGE], ['iban' => $accountIban]);
+            if(null !== $existing) {
+                $this->destError = (string)trans('validation.deposit_src_iban_exists');
+                return false;
+            }
+        }
+
         // if the user submits an ID, but that ID is not of the correct type,
         // return false.
         if (null !== $accountId) {