Merchant Account Fees: What UK Businesses Pay

October 16, 2026

A card rate that looks low on a sales quote can become expensive once terminal rental, minimum monthly charges and online-payment costs are added. Merchant account fees are not always hard to understand, but they are often presented in separate places. For a busy café, retailer or trades business, the practical question is simpler: what will taking payments actually cost each month, and does the setup suit the way you trade?

What merchant account fees cover

A merchant account is the arrangement that allows a business to accept card payments and receive the funds into its bank account. Depending on the provider and payment setup, the acquiring bank, payment processor, card-machine supplier and payment-gateway provider may be the same business or separate organisations.

That is why a payment quote can contain several charges. Some are directly linked to each sale. Others cover the equipment, account administration, security requirements or added services such as online checkout and payment links.

The right arrangement is not necessarily the one with the lowest advertised card rate. A business taking regular, higher-value payments may benefit from a lower processing rate even if there is a monthly account charge. A seasonal business, market trader or newly opened venture may place more value on flexibility and low fixed costs. The numbers only make sense when viewed against real card turnover, average transaction value and how customers pay.

The main merchant account fees to check

A clear quote should show which charges are fixed, which are percentage-based and which may only apply in certain circumstances. Ask for the full schedule rather than relying on a headline figure.

Transaction fees are charged each time a customer pays by card. They may be shown as a percentage of the transaction value, a fixed pence amount, or a combination of both. Rates can vary by card type, whether the payment is made in person or online, and whether it is a UK, European or international card.
Monthly account or service fees cover the merchant account or processing service. Not every arrangement has one, but a low transaction rate can sometimes sit alongside a fixed monthly fee. Check whether a minimum monthly processing charge also applies.
Terminal and EPOS costs may include monthly rental, outright purchase, replacement cover, SIM connectivity and installation. If a card machine is integrated with an EPOS system, there may also be software, support or licence costs to consider.
Online-payment charges can include payment-gateway fees, virtual-terminal access, payment-link charges or e-commerce platform integration costs. These should be assessed separately from face-to-face card acceptance, particularly if online sales are growing.

There may also be charges for PCI DSS compliance support, chargebacks, refunds, retrieval requests, failed direct debits, faster settlement options or paper statements. Not every provider charges each of these, and the terminology varies, which is precisely why comparison needs more than a glance at one rate.

Transaction rates: blended pricing or interchange plus?

Many small businesses receive a blended rate. This is a single percentage for qualifying card transactions, such as 1.2% for standard consumer cards. It is straightforward to budget for because the rate is known in advance, although the detail behind it is less visible.

Interchange-plus pricing separates the underlying card costs from the processor's margin. It can be useful for businesses with substantial turnover or a varied mix of card types, because the provider's charge is clearer. It can also be harder to compare quickly, as the total cost changes depending on the cards customers use.

Neither model is automatically better. A bakery with mostly low-value contactless payments has different priorities from a B2B supplier taking occasional four-figure payments by virtual terminal. The useful comparison is the expected total monthly cost under each option, based on actual trading figures.

Costs that can be missed in a quick comparison

Contract length is one of the most overlooked parts of a payment arrangement. A rate can be competitive for the first few months but tied to a longer commitment, with notice periods or early termination charges. Before applying, establish the contract term, renewal process, cancellation notice and whether any hardware agreement is separate from the merchant-services contract.

Equipment is another area where the lowest monthly figure can be misleading. A portable terminal may be ideal for table service, while a mobile terminal is better suited to a tradesperson working across different locations. But the connection method, battery performance, receipt requirements and integration with the till matter just as much as the rental amount.

For hospitality businesses, an integrated EPOS and payment setup can reduce manual keying and speed up service. There may be an upfront implementation cost, but fewer input errors and quicker reconciliation can offset it over time. For a small independent shop using a standalone card machine, that level of integration may not be necessary.

Settlement timing deserves attention too. Businesses often assume card takings will arrive immediately. In practice, settlement periods vary by provider, risk profile and transaction type. If weekly cash flow is tight, knowing when funds will reach the bank account is commercially significant.

How to compare a payment quote properly

Start with your last three to six months of card statements where possible. These show card turnover, the number of transactions, average transaction value, card mix and the fees already being charged. A quote based only on an estimated annual turnover is useful as a starting point, but it may not reflect the pattern of your trade.

Then separate your costs into three groups: transaction costs, fixed monthly costs and one-off setup costs. Add them together for a typical month, rather than comparing a percentage rate in isolation.

A simple effective-cost calculation can help:

Total monthly payment costs ÷ total monthly card takings × 100 = effective cost percentage

For example, if total payment costs are £180 and card takings are £10,000, the effective cost is 1.8%. This does not mean every payment was charged at 1.8%. It gives you a useful overall figure for comparing like with like.

Also check what is included. Does the quote cover a countertop terminal, a portable device or a mobile card reader? Is a data SIM included? Is next-day replacement available if the terminal fails? Does the payment solution integrate with your existing till, accounting process or online checkout? A cheaper arrangement that creates extra work at the counter may not save money in practice.

Different businesses need different fee structures

A restaurant may care most about portable terminals, tip handling, table service and a reliable connection at busy times. Its merchant account fees should be considered alongside EPOS integration and the number of devices needed across the venue.

A takeaway may process many smaller transactions, including online and telephone orders. It needs to understand card-present, payment-link, gateway and virtual-terminal charges, rather than treating all payments as though they cost the same.

An independent retailer may value clear reporting and a dependable countertop setup, especially where card payments make up most daily takings. A small saving on rates can be worthwhile, but not if reporting is difficult or the terminal is unsuitable at peak times.

For mobile tradespeople, fixed monthly costs and connectivity can matter more than a marginal difference in transaction rate. A machine that works reliably away from the premises, with a practical receipt option and straightforward settlement reporting, can be the better commercial choice.

Questions to ask before you apply

Before committing to a provider, ask for transaction rates by payment type, every fixed monthly charge, hardware costs, contract length and cancellation terms. Confirm expected settlement times, PCI requirements, chargeback fees and what support is available when the terminal or gateway has a problem.

It is also sensible to ask whether the proposed terminal, EPOS system and payment gateway have been checked for compatibility. A payment application is subject to the acquiring partner's approval, and final pricing and terms depend on the approved setup. Clear answers before an application prevent surprises later.

At S2S Payments, the starting point is a review of how the business trades, what it pays now and where the current setup creates friction. That may lead to a lower-cost option, a better-integrated option or confirmation that the existing arrangement is already suitable.

The most useful payment quote is one you can explain back in plain English: what you pay per sale, what you pay each month, how long you are committed for and what happens when you need support. Once those answers are clear, choosing a merchant account becomes a business decision rather than a guess.