What is an IBAN number? IBAN, SWIFT/BIC and sort code explained for Hong Kong businesses

An IBAN number (International Bank Account Number) is a standardised system used to identify individual bank accounts across international borders. While IBAN is widely used in Europe, it is also important for finance teams in Hong Kong to understand how it works alongside other banking codes, such as SWIFT/BIC code and sort code.

This article provides a comprehensive cheat sheet for identifying the right bank details for global suppliers and customers. We cover the definitions of IBAN number, SWIFT/BIC code, and sort code, their specific formats, and when a Hong Kong company needs them. The article also  highlights how Airwallex helps SMEs bypass traditional banking friction to secure faster, cheaper international payments.

What is an IBAN number and how does it differ from other bank codes?

An IBAN number is not a new account number, but rather a standard way to communicate your existing details to foreign banks. It provides a consistent format that includes all the information a bank needs to route a payment directly to a specific person or business. In 2026, many global banking systems rely on this standard to maintain high straight-through processing rates.

What is the format of an IBAN number?

An IBAN number can be up to 34 characters long and contains both numbers and letters. The length of your IBAN depends on your bank account’s geolocation. Here are some examples of IBAN lengths across Europe:

• United Kingdom: 22 characters

• France: 27 characters

• Germany: 22 characters

• Italy: 27 characters

• Switzerland: 21 characters

• Spain: 24 characters

• Norway: 15 characters

Each IBAN number  is comprised of the following codes:

• Country code: Each country that participates in the IBAN system has its own country code.

• Check digit code: This code allows the sending bank to validate the accuracy of the IBAN.

• Bank identifier code: This code identifies the bank or financial institution where the account is held.

• Branch code: Also known as a sort code, this code identifies the bank and branch where the account is held.

• Account number: This code identifies the individual bank account, and is unique to each account.

The bank identifier code, branch code, and account number together make up the Basic Bank Account Number (BBAN). The BBAN is used to identify the specific bank account when you make an international transfer. The IBAN format is the same across countries, although the length of the alphanumeric characters varies by country.

How do IBANs work?

IBANs help banks and financial institutions streamline the process of sending and receiving cross-border payments by:

• Identify the country where the account is held.

• Find the correct bank account.

• Verify that the account number is valid before the payment is made.

When do Hong Kong businesses need to use an IBAN number?

Understanding when to use an IBAN number is essential for Hong Kong businesses operating globally.

IBAN vs SWIFT/BIC code vs sort code: A side-by-side comparison

Navigating international bank codes can be confusing because different regions use different terminology for similar functions. While an IBAN number identifies a specific account, other codes focus on identifying the financial institution or a specific branch. The following table clarifies these roles for Hong Kong finance teams.

Comparison of identifiers by purpose and geography

• The IBAN system is most commonly used by banks in the eurozone. Banks in other countries, including the United Arab Emirates (UAE), Israel, and Ukraine also use the IBAN system.

• A BIC code is the same thing as a SWIFT code, and the terms are used interchangeably by most banks. "BIC" stands for Bank Identifier Code, and it functions like a digital postcode for the receiving bank. While the IBAN number gets the money to the right person, the SWIFT/BIC code ensures it reaches the right financial institution.

How international bank codes work for cross-border payments

When you initiate an international payment, the banking network uses the international bank codes as a roadmap:

1. The SWIFT/BIC code (global routing): This is the first "signpost" the international network looks at. It identifies the specific bank in the destination country. Without this, your money wouldn't know which financial institution to land in.

2. The IBAN number (individual identification): Once the money reaches the correct bank, the IBAN acts as the final address. Because it contains a standardised "check digit," the bank’s system can automatically verify that the account exists before attempting to deposit the funds.

3. The sort code (local branch - UK specific): In the UK, this code acts as a sub-identifier for the specific branch. When you use an IBAN for the UK, this 6-digit code is already tucked inside the IBAN string, allowing the bank to route the money internally to the right local office.

How to choose the right international payment partner

Traditional banks in Hong Kong often charge high flat fees for SWIFT transfers and add hidden markups on exchange rates. For an SME, these costs can add up to thousands of dollars in lost margin every year. To scale efficiently, you need a partner that provides more than just a basic transfer service.

Prioritise local network access

Choose a partner like Airwallex that maintains its own proprietary payment network. By using local rails, you can bypass the SWIFT network entirely in 120+ countries. This strategy avoids intermediary bank charges and ensures that the amount you send is exactly what your recipient receives.

Check for multi-currency capabilities

A modern business account should allow you to settle like-for-like in 20+ currencies. This prevents "forced FX conversions" where your bank automatically converts incoming funds into HKD at a poor rate. With multi-currency accounts, you can receive USD from a client and use those same funds to pay a USD supplier later.

Assess automation tools

As your transaction volume grows, manual entry becomes a liability for your finance team. Look for partners that offer robust API integrations and batch payment features. These tools allow you to sync your international payments directly with accounting software like Xero, reducing the risk of human error.

Secure faster global transfers with Airwallex

Airwallex is designed to help Hong Kong businesses manage their global finance operations in one unified platform. We provide the infrastructure you need to collect, manage, and scale your funds without the limitations of traditional banking. From everyday financial operations to global growth, Airwallex has the solutions to support your business.

By opening an Airwallex account, you gain access to local bank details in 21 countries and regions. This means you can provide your customers in the UK or Europe with an IBAN number and sort code, making it easier for them to pay you. It also means you can avoid the high costs of receiving international wires.

Our platform supports transfers in 90+ currencies to 200+ countries and regions with transparent, market-leading FX rates. You can manage everything through a single dashboard, giving you real-time visibility over your global cash flow. Join over 200,000 businesses worldwide that trust Airwallex to power their global growth.

Frequently asked questions

1. Is an IBAN number the same as an account number? 

No, but it contains your account number. The IBAN is a longer string that includes your account number plus extra information like the country and bank codes.

2. Do I need a SWIFT code if I have an IBAN number? 

Yes, most international transfers require both. The SWIFT/BIC identifies the bank, and the IBAN identifies your specific account within that bank.

3. Does Hong Kong have sort codes? 

Hong Kong does not use "sort codes." Instead, we use a 3-digit bank code and a 3-digit branch code for domestic payments.

4. How do I find my IBAN number? 

If your account has one, it is usually found on your bank statement or within your online banking portal. Note that most HK-based accounts do not have an IBAN.

5. Is it safe to share your IBAN number?

Yes, it’s safe to share your IBAN number with third parties. If you have an IBAN, you'll need to share it to be paid by a business or individual with an overseas bank account.

Sources: 

Information was sourced as of May 2026 for reference purposes. For the latest details, please visit each provider’s official website.

1. https://wise.com/hk/bank-codes

2. https://aspireapp.com/hk/blog/iban-vs-swift

3. https://internationalservices.hsbc.com/international-banking/iban-explained/

Disclaimer: This article was prepared in May 2026 based on voluntary online research and publicly available information. We have not personally tested every tool or provider mentioned. This article is for educational purposes only, and readers should independently evaluate each service provider based on their specific business requirements. Content is updated every six months. To request an update, please contact us at [email protected].