Ask most small business owners what they pay to accept card payments and you will get a single percentage, usually the one that appeared on the proposal. Ask them to reconcile that percentage against what actually left their account last month and the conversation gets vaguer. Card processing is one of the few recurring business costs where the headline number and the real number routinely differ, and the gap between them is large enough to matter to a business running on ordinary margins.
The Quoted Rate Is Only One Component
What a merchant pays on a transaction is assembled from several parts. There is an interchange fee that goes to the card issuer, a scheme fee charged by the card network itself, and the acquirer's margin on top. On a blended pricing plan these are combined into one figure, which is simpler to read and hides which element is actually driving the cost. On interchange-plus pricing they are itemised, which looks more complicated and is considerably more informative. Layered over both are the charges that never appear in the pitch: monthly minimums, terminal rental, PCI compliance fees, authorisation charges, and settlement fees that apply per payout rather than per sale.
The Cost Varies by the Card, Not Just the Sale
Two identical transactions can cost meaningfully different amounts depending on how the customer paid. Consumer debit is generally the cheapest to accept. Commercial and corporate cards cost more, sometimes considerably. Cards issued outside the UK carry their own rates, and card-not-present transactions are priced above those taken in person because the fraud risk differs. This is why a business whose customer mix shifts, perhaps taking more online orders or serving more business clients, can watch its effective rate climb without changing anything about its own arrangements. Working out the blended cost across an actual month of trading, rather than reading the headline percentage, is the only way to know what you are really paying, and it is the sort of exercise an accountancy firm such as Price Bailey would fold into a wider look at margins rather than treating it as a standalone question.
Fees Are Regulated, but Not All of Them
Some of this is subject to oversight. Interchange fees on consumer cards are capped in the UK, which is why that component is relatively consistent across providers. Scheme fees and acquirer margins are not capped in the same way, and the Payment Systems Regulator has examined how card scheme and processing fees are set and how well merchants are able to understand and compare them. The practical implication for a small business is that the parts of the bill you can negotiate are precisely the parts nobody explains clearly, and a provider's willingness to itemise them tells you something about how competitive their offer really is.
Settlement Timing Is a Cash Flow Question
Rates dominate the conversation, but when the money arrives matters just as much for a business managing weekly outgoings. Settlement periods vary between providers, and a difference of a couple of days changes the working capital position of a business with tight cash flow, particularly one paying suppliers on short terms. Some providers offer faster settlement at a price, which may be worth it or may simply be an expensive substitute for a modest overdraft. Either way it belongs in the comparison, because two offers with identical rates are not equivalent if one holds your takings for twice as long.
Reconciliation Is Where the Errors Live
The gap between what a business sold and what its bank account received is where processing costs actually become visible, and it is also where mistakes hide. Payouts are typically net of fees and often batch several days of transactions together, which makes matching them to individual sales harder than it should be. Businesses that reconcile properly find the things nobody would otherwise notice: a fee that was never mentioned, a rate that changed after an introductory period, a refund processed twice. Businesses that simply book the net figure as income are quietly under-recording both their turnover and their costs, which distorts the accounts and can affect a VAT position.
Chargebacks Cost More Than the Sale
A disputed transaction usually carries an administrative fee on top of the reversed payment, and that fee typically applies whether or not the merchant eventually wins. For businesses in sectors with higher dispute rates, this can become a real cost line rather than an occasional annoyance. Keeping clear records of delivery, service and customer communication is the practical defence, since most disputes are decided on evidence rather than argument. Persistent high chargeback ratios also attract attention from acquirers, and a business that develops a poor record can find its terms revised or its account reviewed.
Know the Number Before You Negotiate
The businesses that improve their position are the ones that arrive at the conversation with their own figures. Calculate what you actually paid over several months, expressed as a percentage of card turnover including every fixed charge, and you have something a provider cannot argue with. That number is also the only fair basis for comparing offers, since a lower headline rate attached to a higher monthly minimum is frequently worse for a smaller business. This article is general information rather than financial advice, and a qualified accountant can help you assess how these costs sit within your particular margins.
