Payments

What is Bacs? A Guide to Bacs Payments for UK Businesses

Bacs stands for ‘Bankers' Automated Clearing Services’, the UK's long-established scheme for electronic payments made directly between bank accounts.

iFAST Global Bank

13 Aug 2026 · visibility 139 views

If your business has ever run payroll, paid a supplier, or collected a subscription by direct debit, Bacs was almost certainly the system behind it. Bacs payments are one of the quietest but most heavily used parts of UK payments infrastructure and understanding how it works helps finance teams plan cash flow, time submissions correctly, and choose the right payment method for the job.

What is Bacs?

Bacs stands for ‘Bankers' Automated Clearing Services’. It is the UK's long-established scheme for electronic payments made directly between bank accounts, and it is operated by Pay.UK, the organisation responsible for the country's retail interbank payment infrastructure.

Bacs has running since 1968. According to Pay.UK, more than 160 billion transactions have been debited or credited to British bank accounts through Bacs since its inception¹, and it remains a foundation of everyday business payments till today.

Bacs handles two distinct payment types:

Direct Debit: An instruction from a customer that authorises a third party, such as a company or organisation, to withdraw funds from their account on specified dates. It is commonly used for recurring commitments such as utility bills, insurance premiums and subscriptions.
Direct Credit: A payment made directly into a customer’s account by a third party. Typical examples include salary payments, supplier payments and government benefits.

How do Bacs payments work?

Every Bacs payment follows a fixed three-working-day cycle:

Day 1 (Submission): The payment file is submitted to Bacs, before a set daily cut-off.
Day 2 (Processing): The instructions are processed and validated by the banks involved.
Day 3 (Settlement): Funds are debited from the payer and credited to the recipient.

Bacs payments are only processed on working days. As the three-day cycle is fixed and known in advance, finance and payroll teams can work backwards from a pay date and submit accordingly.

BACS vs Faster Payments vs CHAPS

The UK runs three main payment rails, each built for a different role.

	Bacs	Faster Payments	CHAPS
Speed	Three working days	Near-instant, 24/7	Same day, if submitted before the cut-off on a working day
Fees	Lower transaction fees, typically between £0.05 - 0.50 per transaction	Usually free to the payer	Around £20–£35 per transaction
Availability	Weekdays only	24/7, including weekends and bank holidays	Weekdays only
Best suited for	Bulk and recurring payments: payroll, supplier payments, Direct Debit collections	One-off or time sensitive payments of moderate value	High-value, time-critical payments

How much does a BACS payment cost?

BACS is generally considered one of the most cost-effective ways for businesses to make regular payments. For a business processing hundreds or thousands of payments in a single run, such as a monthly payroll, that low unit cost is a significant advantage over faster or card-based alternatives.

The exact cost depends on your banking provider. At iFAST Global Bank, Bacs Direct Credit (Inbound) and Direct Debit (Outbound) each cost £0.10 per transaction.

Benefits of Bacs payment

Low transaction fees: The per-transaction cost is minimal (generally no more than £0.50 per transaction), which makes Bacs well suited for payroll runs and large supplier batches.

Automation for recurring payments: Direct Debit allows businesses to collect from customers automatically on an agreed schedule, reducing manual chasing and improving collection reliability.
Reliable and secure: Bacs has operated since 1968 and is backed by consumer protections such as the Direct Debit Guarantee, which supports trust on both sides of a transaction.

Limitations of Bacs payment

UK domestic only: This is the key structural limitation for many growing businesses. Bacs moves money only between UK bank accounts and in pounds sterling (GBP).

Slower processing time: The three-day cycle rules Bacs out for anything urgent, making it unsuitable for time-sensitive payments or last-minute settlements.
Strict cut-off times: Missing the daily cut-off rolls the payment to the next processing day, which can push a payroll or supplier payment back a day. The standard Bacs submission window runs for 7am to 10.30pm on weekdays, however individual banks may enforce their earlier cut-off times for their customers. Bacs only be processes on working days, so timing around weekends and bank holidays extends payment timelines.

Manage your business payments more efficiently

For routine domestic payments, Bacs remains a dependable and cost-effective choice, as long as the three-day cycle is accounted for.

Its domestic-only scope is where expanding businesses start to feel a constraint. A business that pays overseas suppliers, employs staff abroad, or collects payments from international customers needs additional payment rails alongside Bacs.

iFAST Global Bank is one of the 32 direct payments participants in the UK’s Bacs Payment System, supporting domestic UK payments. For businesses operating across borders, iFAST Global Bank also handles international payments in more than 50 currencies through a range of payment rails — so the same account can cover both domestic and cross-border needs as a business grows.

👉🏻 Explore our Multi-Currency Business Account

FAQs about Bacs

Is Bacs payment safe?

Yes. Bacs payment files are submitted through Bacstel-IP, a secure, encrypted channel. Access requires secure authentication and Bacs-approved software, and every payment is monitored and validated before it clears.

Is Bacs the same as a bank transfer?

Bacs is a form of electronic bank-to-bank transfer. Bacs and bank transfer are terms which are often used interchangeably.

What are the alternative payment methods to Bacs?

Faster Payments and CHAPS are the main alternatives. Bacs is typically used for scheduled, high-volume payments. While Faster Payments handles immediate everyday transfers and CHAPS is reserved for large, same-day payments.

What do you need to set up a Bacs payment?

You will typically need two things: Recipient’s bank details and a Service User Number (SUN).

For the recipient, you will need their sort-code, account number, name, along with the exact payment amount. A SUN is a unique six-digit number that identifies your business to Bacs. It appears on every communication with the system and is stored to create a record of each transaction. Your business can hold its own SUN or submit through a provider that uses theirs.

What happens if a Direct Debit is incorrectly taken from my account?

If a Direct Debit is taken from your account in error or without your authorisation, you are protected under the Direct Debit Guarantee Scheme. This guarantee entitles you to a full and immediate refund of the incorrect payment. You can raise a claim with your banking provider.

Questions about Bacs payments with iFAST Global Bank? Visit our FAQ page for more details, or contact business.support@ifastgb.com.

Sources:

Pay.UK Bacs Payment System: https://www.wearepay.uk/what-we-do/payment-systems/bacs-payment-system/