A BSB number is a six-digit code that identifies which branch of a UK bank holds your account
BSB stands for Bank Sort Code, though the term "BSB number" is used interchangeably. It tells the banking system exactly which physical or processing location handles your account. When you send money to someone or receive a payment, the BSB number routes that money to the right branch. Without it, the payment cannot reach the correct account.
The six digits break into two parts: the first four identify the bank itself, and the last two identify the specific branch. For example, a Barclays account in London will have a different BSB from a Barclays account in Manchester, even though both are Barclays. Some modern accounts, particularly those held entirely online, may route through a central processing centre rather than a named branch, but they still have a BSB.
You will see the term "sort code" used identically to BSB number in UK banking. They mean the same thing. The number appears on your cheque book, your bank statements, and your online banking portal.
Key Takeaways
- A BSB number is a six-digit code that identifies your bank branch and is required for all UK bank transfers and standing orders.
- The first four digits identify the bank, and the last two identify the branch location or processing centre.
- You can find your BSB number on your cheque book, bank statement, or by logging into your online banking.
- Providing an incorrect BSB number will cause a payment to fail or go to the wrong account, so double-check before sending money.
Where to find your BSB number
Your BSB number appears in several places. The easiest is your cheque book — it is printed at the bottom left of every cheque, usually in a box alongside your account number. If you do not use cheques, log into your online banking and look for account details or account information. Most banks display it prominently on the account summary page.
Your bank statement, whether paper or digital, will also show the BSB. If you have a debit card, the number is not printed on the card itself, but your bank can tell you over the phone or through their app. You can also call your bank's customer service line and ask — they will confirm it in seconds.
If you have lost track of which bank you use or cannot access your online account, your bank's website usually has a branch finder tool. Enter your postcode or branch name, and it will return the BSB for that location.
When you need to provide your BSB number
You must provide your BSB number whenever you set up a payment that goes to your account. This includes bank transfers from other people, standing orders (regular automatic payments), direct debits, and salary payments from your employer. The person or organisation sending you money needs both your BSB and your account number to route the payment correctly.
If you are sending money to someone else, you need their BSB number, not yours. Ask them for it directly — do not guess or use an old number if you are not certain it is current. A wrong BSB will cause the payment to fail or, in rare cases, reach a different account holder with a similar account number at a different branch.
You do not need a BSB number for online payments to businesses that use payment links or card readers. You also do not need it for contactless card payments or cash withdrawals. It is specifically for bank-to-bank transfers and standing instructions.
What happens if you use the wrong BSB number
If you provide an incorrect BSB number, the payment will either fail or go to the wrong place. Modern banking systems check whether the BSB and account number combination exists before processing the transfer. If the combination does not match any real account, the payment bounces back to the sender within one to two working days, and the money returns to their account.
If the BSB exists but the account number does not match that branch, the payment may be rejected or held for manual review. Some banks will contact the account holder to ask if they want to accept a payment sent to them by mistake. If they do, the money stays with them, and recovering it becomes difficult.
This is why banks now ask you to confirm the name of the account holder before you complete a transfer. If the name does not match the account you are paying into, the system will warn you. Always check this step — it is your protection against sending money to the wrong person.
BSB numbers and online banking security
Your BSB number is not secret information. It is safe to share it with anyone who needs to send you money. It does not give someone access to your account or allow them to withdraw funds. Think of it like your address — it tells people where to find you, but it does not give them keys to your house.
Your account number, by contrast, should be treated more carefully. Combined with your BSB, it identifies your specific account. However, even together, these two numbers alone cannot be used to withdraw money or make payments from your account. Your bank will also require your PIN, password, or biometric verification before any transaction goes through.
Never share your PIN, password, or the three-digit security code on the back of your debit card. Your bank will never ask for these. If someone contacts you claiming to be from your bank and asks for these details, it is a scam.
Changes to your BSB number
Your BSB number can change if your bank merges with another bank, if your branch closes, or if your account is moved to a different processing centre. When this happens, your bank will notify you in advance and provide your new BSB number. They will also update it in your online banking automatically.
If your branch closes, your account does not close with it. Your bank will move your account to another branch or a central processing centre, and you will receive a new BSB number. Any standing orders or direct debits you have set up will need to be updated with the new number. Your bank usually handles this automatically, but check your statements for a few months to confirm payments are going through.
If you have given your old BSB number to someone who pays you regularly (such as your employer), contact them and provide the new number. Payments sent to the old BSB may fail or be delayed.
International payments and BSB numbers
If you are receiving money from outside the UK, the sender will not use your BSB number. Instead, they will use your IBAN (International Bank Account Number), which includes your BSB as part of a longer code. Your IBAN is 22 characters long and starts with "GB". You can find it in your online banking or by asking your bank.
If you are sending money abroad, you will not need the recipient's BSB. You will need their IBAN or, in some cases, their SWIFT code (also called a BIC code). These international codes route money across borders, whereas a BSB only works within the UK banking system.
Frequently Asked Questions
Is my BSB number the same as my account number?
No. Your BSB number is six digits and identifies your branch. Your account number is usually eight digits and identifies your specific account within that branch. You need both together to receive a bank transfer.
Can someone steal money from my account if they have my BSB and account number?
No. They would also need your PIN, password, or biometric verification to access your account or move money. Your BSB and account number alone cannot be used to withdraw funds or make payments.
What if I give my BSB number to the wrong person?
There is no security risk. Your BSB is not confidential. However, if you give them your account number as well, they could potentially send you money by mistake. If that happens, contact your bank when ready — they can sometimes recover it, but it depends on whether the sender also requests it back.
Do I need a BSB number for a business account?
Yes. Business accounts have BSB numbers just like personal accounts. The process for finding and using it is identical.
What if my bank does not have a branch near me?
You do not need a physical branch near you. Your BSB identifies where your account is processed, not where you have to visit. You can bank entirely online and still have a BSB number. If your bank closes its branches, they will move your account to a processing centre and give you a new BSB.