Practical guide to verifying IBAN numbers before transfer and avoiding costly mistakes

Whenever you send money to an overseas account, a simple question comes to mind: is the bank account number correct? In many countries, the traditional account number is replaced by IBAN, a standardised string that includes information about the bank, country and account number. An error in any part of this string may result in the money being sent to another account, or the transaction being rejected entirely, which could cost you time and money.

What is IBAN and why does it matter to you?

IBAN stands for “International Bank Account Number”. It was designed to reduce errors in international transfers and standardise the way account numbers are written across borders. IBAN length ranges from 15 to 34 characters depending on the country, and always begins with a two-letter country code, followed by two check digits, then bank and customer account details.

Components of an IBAN number

The basic structure of an IBAN consists of four main parts:

• Country code (2 letters): identifies the country where the account is held (for example: SA for Saudi Arabia, AE for the United Arab Emirates).
• Check digits (2 numbers): calculated using a specific algorithm to detect any input errors.
• Bank code (usually 4 letters or numbers): identifies the receiving bank.
• Account number (8 to 30 digits): is the customer’s account number within the bank.

The latter parts may vary according to each country’s system, but the general rule is that each part must be written without spaces or separators.

Steps for manual IBAN verification

If you wish to check an IBAN without relying on apps, you can follow these steps:

• 1. Make sure the length matches the IBAN length for the recipient country. Example: in Saudi Arabia the length is 24 characters.
• 2. Remove any spaces or hyphens between the numbers; keep the character sequence uninterrupted.
• 3. Move the first four characters (country code + check digits) to the end of the string.
• 4. Replace each letter with a number according to the table A=10, B=11 … Z=35.
• 5. Calculate the remainder when divided by 97. If the result is 1, the IBAN is valid according to the check algorithm.

This process may seem complex at first glance, but it shows how a simple mistake in writing a letter or number can ruin the entire transaction.

Electronic tools that help you

With advancing technology, you do not need to calculate everything manually. There are free websites and apps that perform the same task with high accuracy, such as:

• IBAN.com – online IBAN checker, supports over 70 countries.
• Microsoft Excel – you can add a custom function to calculate the mod 97 remainder.
• Smartphone apps such as “IBAN Validator” or “BankTools” that allow instant checking using the camera.

Choose the tool that suits you, but always remember to manually verify the result if the amount is large.

Real‑world examples illustrating common mistakes

Example 1: Salim wanted to transfer 5000 riyals to an account in Jordan. He wrote the following IBAN: JO94 1234 5678 9012 3456 7890. He noticed he had placed a space between every four digits, which is not accepted in the banking system, so the transfer was rejected and the money was returned to him. To fix the problem, he removed the spaces and rewrote it as JO9412345678901234567890, after which the transfer succeeded.

Example 2: Sara sent her account number to a friend via text message, but one digit turned into an “O” instead of a “0” due to a typographical error. When her friend tried to send money, it ended up in another account in a different country. Once the error was discovered, Sara went to a bank branch to correct the IBAN and avoid losing the amount.

What to do if you discover an error after sending

Do not hesitate to contact the bank immediately. Most banks have procedures to retrieve funds in cases of clear errors, especially if the transfer is incomplete or still being processed. You may be asked to provide a copy of the correct IBAN and proof of the sender. Remember to:

• report within 24 hours of discovering the error.
• keep the original transfer receipts.
• confirm the new IBAN number in writing to avoid further confusion.

In some cases, the bank may charge a small fee to recover the funds, but this fee is usually much less than the potential loss if the error is not corrected.

Tips to reduce future risks

To avoid falling into the trap of repeated mistakes, follow these simple practices:

• Use the saved lists in messaging apps that allow copying IBAN without alteration.
• Rely on online bank enquiries that display the IBAN in a ready‑to‑copy format.
• Before each transfer, ask the recipient to confirm the IBAN via a trusted channel (such as a phone call).
• Make IBAN checking part of your financial routine, especially when dealing with large amounts.

By following these steps, you will keep your transfers safe and reduce the mental stress associated with banking errors.