What's an IBAN? Understanding International Bank Account Numbers

Dealing with international payments can sometimes feel complicated, especially when you encounter terms like IBAN for the first time. It might look like a random jumble of characters, but this code is actually the key to moving your money safely and efficiently across borders.

In short, the International Bank Account Number (IBAN) is part of a globally recognised system designed to standardise the identification of accounts around the world. It’s an essential piece of information for sending or receiving international payments.

What's an IBAN and why do we use it?

IBANs were developed to allow automated processing and speed up cross-border transfers across the European Economic Area (EEA) and beyond. Most of the world's financial systems now use this method to make sure they identify recipient accounts the same way.

Before the IBAN system became widely adopted, the format of account numbers varied from country to country. This created a lot of confusion and often caused payments to be delayed, rejected, or sent to the wrong person.

The IBAN standard ensures that when you send money from your account in the UK to someone in Spain, for example, all the necessary information about the account and the corresponding institution is encoded in a single, predictable format. This lets payment systems check the details before the money is sent, which makes payments less likely to fail.

The purpose of the IBAN code

The core purpose of the IBAN is twofold:

• Unique identification: it provides a unique identifier for an individual account involved in an international money transfer, specifying the exact account and its location. This ensures the money goes to the intended person.
• Validation: it contains check digits that allow the sending institution to verify the IBAN before starting the transaction. This validation step helps prevent costly and frustrating errors, such as a payment being sent to a non-existent account number.

While it is called the International Bank Account Number, a common mistake is assuming that it's only for banks. Many other financial services providers, like us, also use and issue IBANs to their customers to allow for easy payments in the global financial system.

Breaking down the structure of an IBAN

An IBAN is made up of the following elements, in this specific order:

IBANs in the UK

In the UK, an IBAN is 22 characters long. The structure can be broken down into blocks of 4 for readability:

1. GB is the country code for Great Britain
2. xx are the 2 check digits used for validation
3. The next 8 characters are the bank's sort code
4. The final 10 characters are the local account number

You'll almost always see the IBAN written in blocks of 4 characters to make it easier to read and copy. When you enter it into a payment system, however, you should always enter it as a continuous string of characters with no spaces to make sure the system processes it correctly.

IBAN vs SWIFT/BIC: what’s the difference?

When dealing with international transfers, you might also hear the terms SWIFT code or BIC. While they're both used in international money transfers, they serve different functions:

• International Bank Account Number (IBAN): this is the unique identifier for a specific, individual account. You need the IBAN to know where the money is ultimately going.
• Society for Worldwide Interbank Financial Telecommunication (SWIFT) or Bank Identifier Code (BIC): this is the code that identifies a specific bank or financial institution. You need the SWIFT or BIC to identify which institution the payment should be routed through.

When you make an international payment outside the SEPA zone, you'll often be asked to provide both the recipient's IBAN and the SWIFT/BIC of their financial institution. This helps make sure the money lands in the right institution and the right account.

Note that while many countries (including the US, Canada, Australia, and Singapore) recognise the IBAN standard, they often rely on the SWIFT code for outbound transfers.

What happens if I use the wrong IBAN?

One of the biggest concerns with any cross-border payment is the risk of error. While the IBAN system is designed to reduce mistakes, incorrect details can still lead to complications and‌ losing money.

The role of check digits in validation

The 2 check digits within the IBAN are there for your protection. When you enter an IBAN into a payment form, the bank’s system runs an algorithm based on all the other characters in the code. If the result of that calculation doesn't match the check digits you entered, the system will immediately flag the number as invalid and reject the transfer before it's even sent. This prevents money from being lost due to a simple typo.

However, the check digit system can't detect all errors. If you enter the IBAN for the wrong person, but that IBAN is still structurally valid (meaning the check digits are correct for the numbers entered), the payment will go ahead. This is why verifying the recipient's name is just as important as checking the digits.

Common reasons for failed transfers

If a payment fails or is returned, it's often due to one of these common mistakes, which the check digits might not catch:

• Wrong recipient name: the name provided doesn't match the name attached to the IBAN. While some systems don't mind this, others will require an exact name match, leading to rejection.
• Missing or incorrect SWIFT or BIC: while the IBAN points to the account, the SWIFT or BIC points to the receiving bank. If this is wrong, the payment can't be routed correctly.
• Currency mismatch: attempting to send a currency that the recipient's account isn't set up to receive forces an automatic conversion or rejection.
• Numerical errors: mistakes in the local account number or sort code can sometimes still pass the check digit validation, though this is rare.

If the payment is sent to a real but incorrect account, getting your money back can be a lengthy and complex process, often requiring the cooperation of the receiving bank and the person who got the money. Always double-check the full details before confirming a transfer.

How we help with your IBAN

Managing money internationally requires more than just knowing what an IBAN is — you need a financial platform that makes using that code simple and beneficial. We help you use your IBAN with confidence, whether you're travelling, sending money to family, or handling freelance payments.

One of the main advantages of an account with us is the ability to hold and manage money in multiple currencies. For many major currencies, we provide you with local account details, which often include an IBAN.

• Receiving euros: when receiving euros from anywhere in the SEPA zone, you can give the sender your euro IBAN. The transfer is treated as a local European payment, meaning it’s typically faster and often free for the sender, saving on intermediary bank fees.
• Sending globally: we offer clear, real-time conversions when you send money internationally, showing you exactly what the recipient will receive before you hit Send, removing the fear of additional fees or poor exchange rates.

This means you get simplified payments and avoid‌ the typical high costs and delays that can come with traditional cross-border payments.

Essential tips for sending money abroad safely

Transferring money internationally requires caution. Here are 4 quick tips to make sure your money reaches its destination:

1. Verify the recipient: always confirm that the recipient’s full name and address match the account details. For new beneficiaries, it's a good idea to send a small, test transfer first. When receiving money, make sure the sender has your full personal details (name and address) and the correct IBAN.
2. Use trusted platforms: stick to reliable financial services like ours that provide high levels of security and clear tracking of your payments.
3. Beware of scams: if you're asked to send money quickly to an unfamiliar IBAN, or if someone uses urgent language, pause and check with them through a separate, trusted communication channel.
4. Confirm the purpose: when sending large amounts of money, some institutions may ask you the reason for the payment and the details of your relationship with the recipient for compliance and anti-fraud measures.

Beyond your IBAN: a quick guide to UK payments

While your IBAN is mainly used for international and Eurozone payments, you’ll often encounter other payment terms related to domestic transfers. Understanding these helps clarify where and when to use your sort code and account number vs your IBAN.

SEPA, BACS, and CHAPS explained

These terms define the network and speed at which money is moved:

• Single Euro Payments Area (SEPA): this is the system for making and receiving euro payments within the Eurozone, as well as a few non-euro countries (like the UK, Norway, and Switzerland). SEPA transfers primarily use the IBAN and are generally fast.
• Bankers' Automated Clearing Services (BACS): this is the main domestic electronic payment system in the UK. BACS is used for Direct Debits and Credits like salary payments. Transactions are processed in batches and usually take 3 working days to clear.
• Clearing House Automated Payment System (CHAPS): this is the UK’s same-day payment system for large transactions like buying a house. CHAPS is fast but usually carries a high fee.

For the majority of your everyday UK domestic transactions you’ll only need the UK sort code and account number, not the IBAN. The IBAN is mainly for international transactions.

How do I find my IBAN number?

If you're expecting an international payment, knowing where to find your IBAN is essential. Here are some ways you can find it:

1. On your statements: your IBAN is usually printed near your name and address, or alongside your account number and sort code
2. In your online portal or app: most financial institutions display your IBAN in the account details or statements section of their online banking platform or app
3. Contact your provider: you can always ring the customer service line for your financial service provider and ask for your full IBAN

While useful for checking the format of a number, online tools shouldn't be trusted to generate your official IBAN from scratch, as they may be incorrect. Always rely on the details provided directly by your financial service provider or ask them for it directly.

For our customers, finding your IBAN is quick and straightforward, and you can access it 24/7. Here's how:

1. Open the app on your phone.
2. Tap Details, then International.
3. Your full international details, including your IBAN and BIC/SWIFT code, will be displayed clearly. You can copy the IBAN directly to your clipboard from this screen.

Get your Revolut IBAN

If you're ready to start taking advantage of a modern account that makes sending and receiving money across borders a seamless process, here's how to get set up with us:

1. Download the app: get the Revolut app in the App Store or Google Play.
2. Sign up: follow the simple on-screen instructions to create your account. You'll need to provide some personal information and verify your identity — this usually only takes a few minutes.
3. Select your plan: choose the plan that best suits your needs, from our free sign-up Standard plan to our paid plans with extra benefits.
4. Add money: once your account is active, you can easily add money via a bank transfer or a debit card.
5. Access your IBAN: head to the Details section to find your full account details, including your IBAN, ready to be used for local and international transfers straight away.

You can now start receiving and sending money globally, using your new account as your main place to manage your finances.

The information provided is accurate as of 22 September 2025.

T&Cs apply.