What BACS is and how it works

BACS (Bankers' Automated Clearing Services) is the system that moves money between UK bank accounts. When you set up a BACS payment, your bank sends your payment instruction to a clearing house, which batches it with thousands of others and settles it two working days later. The money lands in the recipient's account automatically — no cheque, no cash, no real-time confirmation.

BACS is the standard method for paying bills, salaries, and regular transfers in the UK. It costs nothing to send and nothing to receive. The two-day delay is built in: you initiate on Monday, the money clears on Wednesday. This matters if you're paying a bill due on Tuesday — BACS won't reach in time.

You'll use BACS through your bank's online platform, mobile app, or by phone. The process is the same whether you're paying a person, a business, or a government body. You need the recipient's name, account number, and sort code — the six-digit number that identifies their bank branch.

Key Takeaways

  • BACS payments take two working days to clear, so plan ahead if you have a specific important date.
  • You need the recipient's name, sort code, and account number — get these details right or the payment will bounce back.
  • BACS is free to send and free to receive, making it the cheapest way to move money between UK accounts.
  • Most banks let you set up standing orders (automatic BACS payments on a schedule) through online banking or by phone.
  • If a BACS payment fails, your bank will tell you why and the money returns to your account within a few days.

How to send a one-off BACS payment through online banking

Log into your bank's online platform or mobile app. Look for a button or menu item labelled "Send money", "Make a payment", "Payments", or "Transfers". The exact wording varies by bank, but the function is always in the same place.

Select "New payee" or "Add recipient" if this is the first time you're paying this person or business. Enter the recipient's full name exactly as it appears on their bank account — if their account is under "J Smith" and you type "John Smith", the payment may be rejected. Enter their sort code (six digits, usually shown as three pairs: 12-34-56) and their account number (eight digits). Double-check both before you continue.

Enter the amount and a reference if you want one — this is optional but useful for tracking. Many people use invoice numbers, their own name, or a short description of what the payment is for. The reference appears on the recipient's statement, so keep it brief and clear.

Review the payment details on the confirmation screen. Check the recipient's name, sort code, account number, and amount one more time. Once you confirm, the payment is sent to BACS and cannot be cancelled — it will clear in two working days unless something goes wrong.

Setting up a standing order for regular payments

A standing order is a BACS payment that repeats automatically on a schedule you set. Use this for rent, subscriptions, loan repayments, or any bill that stays the same amount each month. Set it up once and it runs until you cancel it.

In your online banking, find the standing order section — usually under "Payments" or "Manage payments". Select "Create standing order" or "Set up new standing order". Enter the recipient's details (name, sort code, account number) the same way you would for a one-off payment.

Set the amount, the start date, and the frequency. Most banks offer weekly, fortnightly, or monthly options. Choose when the payment should stop — either a specific date or "until further notice". Review the details and confirm.

Your bank will send the first payment on the start date you chose. After that, it repeats automatically. You can change or cancel a standing order at any time through online banking or by calling your bank.

What happens if a BACS payment fails

A BACS payment fails when the sort code or account number is wrong, or when the recipient's bank rejects it for another reason — for example, the account is closed or the name doesn't match. When this happens, your bank holds the payment and tries to return it to you.

The return process takes a few working days. Your bank will notify you (usually by email or through online banking) that the payment failed and explain why. The money goes back into your account automatically — you don't have to do anything. Check your account to confirm the refund has arrived.

Once you know why it failed, contact the recipient to get the correct details. Ask them to confirm their sort code and account number in writing, or ask them to provide it on their invoice or website. Then send the payment again with the correct information.

BACS versus faster payment methods

BACS takes two working days. If you need money to arrive the same day or next day, use Faster Payments or when ready Payments instead. Faster Payments clears within a few hours (usually by the end of the same working day). when ready Payments clears in seconds, 24 hours a day, seven days a week.

Both cost more than BACS — Faster Payments typically costs £0.20 to £1.50 per transaction, and when ready Payments costs £0.50 to £2.00. BACS is free. If you have time and want to save money, BACS is the right choice. If you need the money urgently, pay the fee for a faster method.

Not all banks offer all three methods, and not all recipients can receive when ready Payments. Check your bank's payment options before you decide. If your bank doesn't offer what you need, you may be able to phone them and ask them to send it a different way.

Common mistakes and how to avoid them

The most common mistake is typing the sort code or account number wrong. A single digit wrong and the payment bounces back. Write down the details before you enter them, or copy and paste them directly from the recipient's invoice or website. Do not type them from memory.

The second mistake is getting the recipient's name wrong. Banks now use a system called Confirmation of Payee (CoP) that checks whether the name matches the account. If it doesn't match closely enough, your bank will warn you or block the payment. If your bank warns you, stop and ask the recipient to confirm their name and account details.

The third mistake is sending a BACS payment when you need the money to arrive by a specific date. BACS takes two working days, so if you send it on Friday, it won't clear until Tuesday. If the important date is Monday, use Faster Payments or when ready Payments instead, or send the BACS payment earlier in the week.

The fourth mistake is assuming a BACS payment has failed if it hasn't arrived within 24 hours. BACS takes two working days by design. If it's been two working days and the money hasn't arrived, contact your bank. If it's been less than two working days, wait.

When BACS is the right choice

Use BACS when you have time and want to save money. It's free, reliable, and works for any UK bank account. Use it for bills, rent, loan repayments, and regular transfers to friends or family.

BACS is also the standard method for payroll — your employer almost certainly pays you by BACS. If you're setting up a payment for someone else's payroll, BACS is what they'll expect.

Don't use BACS if you need the money to arrive urgently, if the important date is within two working days, or if you're sending money abroad. For international transfers, use a specialist money transfer service or your bank's international transfer service. For urgent domestic transfers, use Faster Payments or when ready Payments.

Frequently Asked Questions

What if I send a BACS payment to the wrong person by mistake?

Contact your bank when ready and explain what happened. Your bank can try to recall the payment before it clears, but this only works if you catch it within a few hours. If the payment has already cleared, your bank can ask the recipient's bank to return it, but the recipient has to agree. If they refuse, you may have no way to recover the money. This is why checking the details before you confirm is so important.

Can I cancel a BACS payment after I've sent it?

Not reliably. Once you confirm a BACS payment, it goes into the clearing system and you cannot stop it. Your only option is to contact your bank when ready and ask them to try to recall it, but this only works if they catch it before it clears — usually within a few hours. After that, the money is gone and you have to ask the recipient to send it back.

Do I need a reference number to send a BACS payment?

No. The reference is optional. However, it's useful for both you and the recipient — it helps you track what the payment was for, and it appears on their statement so they know who sent it. If you're paying an invoice, use the invoice number as the reference.

Why does my bank ask for a sort code if it already has the account number?

The sort code identifies the specific branch where the account is held. The account number alone is not enough — the same account number could exist at different branches. Together, the sort code and account number uniquely identify the account. This is why both are required.

What's the difference between a standing order and a direct debit?

A standing order is a BACS payment you set up and control — you decide the amount and when it goes out. A direct debit is a payment the recipient can take from your account on their schedule, within limits you set. Standing orders are better for fixed payments like rent. Direct debits are better for variable bills like utilities, because the amount can change.