SWIFT & IBAN Guide

Every international bank transfer relies on a set of standardised codes and identifiers to ensure funds reach the correct account, at the correct bank, in the correct country. Without these identifiers, cross-border transfers would have no reliable mechanism for routing.

The two most important international banking identifiers are the SWIFT/BIC code — which identifies the bank — and the IBAN — which identifies the specific account. Understanding how these codes work, how they differ from domestic identifiers like routing numbers and sort codes, and how international transfers are actually routed is essential for anyone sending or receiving money internationally.

SWIFT stands for Society for Worldwide Interbank Financial Telecommunication. It is a global financial messaging network that enables banks and financial institutions to securely communicate and exchange payment instructions with each other across international borders.

Crucially, SWIFT does not move money itself. It is a messaging system — a secure, standardised way for banks to send instructions to each other. The actual movement of funds happens through the banking system, triggered by these messages.

SWIFT was established in Belgium in 1973 and is co-operatively owned by its member financial institutions. It serves thousands of financial institutions across the globe and processes millions of messages per day covering payments, securities transactions, and treasury operations.

When you initiate an international bank transfer, your bank uses the SWIFT network to communicate the payment instruction to the recipient's bank (often via one or more intermediary banks). The SWIFT code of the recipient's bank tells the network exactly where to send the message.

A BIC (Bank Identifier Code) is the formal ISO 9362 standard name for the code that identifies a bank in international transactions. In practice, BIC and SWIFT code are used interchangeably — they refer to the same alphanumeric identifier.

A SWIFT/BIC code is structured as follows:

SWIFT/BIC codes can be 8 or 11 characters. An 8-character code refers to the bank's primary office. An 11-character code identifies a specific branch. When only an 8-character code is available, "XXX" is often appended automatically by banking systems.

An IBAN (International Bank Account Number) is a standardised format for identifying a specific bank account in an international transfer. Where the SWIFT/BIC code identifies the bank, the IBAN identifies the individual account at that bank.

The IBAN standard is defined by ISO 13616. It is widely adopted across Europe, the Middle East, and parts of North Africa, but many major countries including the United States, Canada, Australia, India, and China do not use IBANs — transfers to these countries rely on a SWIFT code plus a local account number.

Every IBAN follows the same general structure, though its length varies by country.

IBAN lengths by selected country:

B = Bank code, S = Sort/branch code, A = Account number, k = Check digit. Formats vary by country.

A domestic account number identifies an account within a specific bank. The same account number format could theoretically exist at a different bank in a different country — without additional context, it is ambiguous in an international setting.

An IBAN solves this by embedding the country code, bank identifier, and account number into a single standardised code with built-in check digits. This makes it unambiguous and machine-readable across borders.

SEPA (Single Euro Payments Area) is a European payment integration framework that simplifies and harmonises euro-denominated bank transfers across participating countries. SEPA was designed to make cross-border euro payments within the participating area as simple and cost-effective as domestic transfers.

SEPA payments use the IBAN and BIC identifiers. The main SEPA payment types are:

SEPA includes all EU member states as well as several non-EU countries including Iceland, Norway, Liechtenstein, Switzerland, and the UK (the UK continues to participate in SEPA despite leaving the EU). SEPA applies to euro transfers only — transfers in other currencies use the standard international banking channels.

When you instruct your bank to send an international wire transfer, the following sequence typically occurs:

Not every bank in the world has a direct banking relationship with every other bank. To enable cross-border payments between institutions that do not have a direct relationship, the global banking system relies on a network of correspondent banks.

A correspondent bank is a financial institution that holds accounts on behalf of other banks and executes transactions in foreign currencies on their behalf. Large global banks — particularly those in major financial centres — serve as correspondent banks for smaller regional and local banks around the world.

Each correspondent bank along the chain may deduct a fee. This is why the amount received by the beneficiary in a traditional SWIFT wire transfer can sometimes be slightly less than the amount originally sent. Modern money transfer services often work around this by using their own internal networks or local payment systems rather than routing through the full correspondent banking chain.

An intermediary bank is any bank that sits between the sending bank and the receiving bank in a SWIFT wire transfer. In practice, intermediary and correspondent bank are often synonymous terms. When initiating a transfer, you may be asked to provide intermediary bank details if your sending bank requires them.

Intermediary banks are relevant because they:

• May charge their own fees, reducing the amount delivered to the recipient
• Add processing time to the transfer chain
• Perform their own compliance checks, which can cause delays
• Are identified by their own SWIFT/BIC codes in payment instructions

The SHA, OUR, and BEN fee arrangements in a SWIFT transfer specify who bears the cost of intermediary fees:

Understanding SWIFT codes, IBANs, and the correspondent banking network demystifies how international transfers actually work and helps you avoid costly errors.

• A SWIFT/BIC code identifies the bank. It is 8 or 11 characters and used globally.
• An IBAN identifies the specific bank account. It is used in Europe, the Middle East, and parts of Africa — not universally.
• IBAN-supported countries need both a SWIFT/BIC and an IBAN for incoming international transfers.
• Non-IBAN countries (US, Australia, India, Canada, etc.) use a SWIFT code plus local account number.
• SEPA simplifies euro transfers within Europe using IBAN and BIC.
• Correspondent and intermediary banks route funds between institutions without direct relationships, and may charge fees.
• Always verify bank details independently before initiating large transfers to protect against payment fraud.