Card processing fees are the charges a merchant pays to accept card payments, and in the UK they quietly shape your VAT return, your Corporation Tax bill, and what HMRC expects to see.
If you have ever wondered how much card processing fees really cost, whether you pay VAT on them, and whether they cut your tax bill, this guide answers all of it from the merchant's side of the counter. The short version: card processing fees carry 20% VAT, they are deductible against Corporation Tax, and HMRC judges your turnover on the gross sale, not the net payout.
payabl. is a payments provider, not a tax adviser. This guide explains how card processing fees interact with VAT, Corporation Tax and HMRC record-keeping so you can have an informed conversation with your accountant. It is general information, not tax advice.
What card processing fees really cost you
Every card sale passes through several hands before the money lands in your account. In the UK, interchange is capped at 0.2% for consumer debit cards and 0.3% for consumer credit cards, but scheme fees and your acquirer's margin sit on top of that. The rate you were quoted is rarely the whole story, and the card payment costs UK merchants actually absorb are higher than the headline number suggests. For small businesses especially, those card machine fees add up fast.
Do you pay VAT on card processing fees?
Yes. In the UK, card processing fees are standard-rated at 20% VAT and do not qualify for the financial services exemption. Many merchants assume anything touching a bank is VAT-free, so this is one of the most common questions about card processing fees. The answer is that the fee is a taxable service, and the VAT on those merchant fees is real.
There is a twist if your payment provider bills you from outside the UK. In that case, VAT is often handled through the reverse charge, which means you account for the VAT on your own return rather than the provider adding it to the invoice. For a VAT-registered merchant making taxable sales, the reverse charge is usually neutral, output tax and input tax cancel out, but HMRC still expects to see it recorded correctly. If your business is partially exempt, some of that VAT becomes a genuine cost.
Are card processing fees tax deductible against Corporation Tax?
Yes. Card processing fees are an allowable business expense, so they reduce the profit your Corporation Tax is calculated on. The logic is straightforward: if your business processes £120,000 in card sales and pays £3,600 in fees, that £3,600 comes off your taxable profit. The same applies whether you take payments online, in store, or on the move, so yes, card machine fees are tax deductible too.
The catch is that the deduction only works cleanly if you record your sales at the gross value the customer paid, not the net figure that lands in your bank after fees. Get the starting number wrong and both your VAT return and your Corporation Tax computation inherit the error.
A worked example, from sale to tax
| What happened | Amount | Where it lands |
| Customer pays (gross sale) | £10,000 | Turnover for VAT and Corporation Tax |
| Card processing fees | £300 | Allowable expense (reduces taxable profit) |
| VAT on the fees (reverse charge) | £60 | Declared and, if recoverable, reclaimed |
| Net payout to your bank | £9,700 | Cash received, NOT your turnover |
The £9,700 reconciles to your bank statement, but your turnover is £10,000. Tell HMRC otherwise and you have understated your sales by the size of your card processing fees, every single month.
The number HMRC cares about is gross, not net
For HMRC, your turnover is the gross amount the customer paid, not the net payout that reaches your bank after card processing fees. This is the single most expensive misunderstanding in merchant bookkeeping. When you post net payouts as revenue, you understate turnover and risk crossing the VAT registration threshold without realising it.
This matters most as you grow. The VAT registration threshold is tested against gross taxable turnover, so a merchant processing £92,000 of card sales who only banks £89,000 after fees has still crossed the line. Watching net payouts instead of gross sales is a common route to late VAT registration and a backdated bill.
Reconciling your card payments so HMRC is satisfied
Bank deposits alone are not sufficient evidence of turnover for HMRC; you must reconcile each payout against its full settlement report. The gap between the two is made up of card processing fees, refunds, and chargebacks, and HMRC expects you to account for every part of it. Learning to reconcile card payments for HMRC is what turns a nervous year end into a routine one.
Here is where omnichannel merchants feel the pressure. If you sell online, take payments at a POS terminal, and accept Tap to pay on a phone, you have three streams of settlements to line up against one bank account. The good news for your records is consistency: the VAT treatment of a processing fee is identical whether the sale happens online, at a POS terminal, or via Tap to pay. One rule, three channels, one reconciliation.
Sound HMRC record keeping for card payments means keeping transaction-level reports, not just bank statements. Match gross sales to fees to net payouts, keep the settlement files, and you can trace any sale from the customer's card to your bank on demand.
Reconciliation is really just checking the water bill against every stage of the pipe, not only what dribbles out of the tap. Post the trickle as your total and you are telling HMRC your reservoir was the size of your tap.
What card processing fees mean for your margin
Since January 2018, UK merchants cannot pass consumer card fees on to customers as a surcharge. That rule changes how you should think about the VAT on those fees. Because you cannot surcharge, the 20% VAT on your card processing fees is absorbed into your margin, not passed to the customer. For a CFO at a subscription or SaaS business, that is a pricing decision, not a bookkeeping footnote: every renewal carries a processing fee, and the VAT on it, that you can never recover from the buyer.
The lesson for merchants is simple. Price with your true, all-in cost of acceptance in mind, reconcile on gross, and treat your card processing fees as the deductible expense they are. Do that, and card acceptance stays a growth engine rather than a quiet drain on profit.
Knowing the true cost of your card processing fees is how merchants protect their margin
Card processing fees are not just a checkout line item; they touch your VAT return, your Corporation Tax computation, and everything HMRC asks to see. The merchants who stay in control are the ones who know the fee carries 20% VAT, that it lowers their taxable profit, and that HMRC always measures turnover on the gross sale. Whether the payment arrives online, at the till, or through Tap to pay, the treatment is the same and the trail must be complete. Understand what your card processing fees truly cost you, and you turn a hidden leak into a managed, deductible, fully accountable cost.
FAQ
How much are card processing fees in the UK?
Card processing fees combine interchange (capped at 0.2% for consumer debit and 0.3% for consumer credit cards), scheme fees, and your acquirer's margin. The rate you are quoted is rarely the full cost, so compare providers on the all-in rate, not just the headline percentage.
Do you pay VAT on card processing fees in the UK?
Yes. Card processing fees are standard-rated at 20% VAT and do not qualify for the financial services exemption. If your provider invoices you from outside the UK, the VAT is usually handled through the reverse charge, so you account for it on your own VAT return.
Are card processing fees tax deductible against Corporation Tax?
Yes. Card processing fees are an allowable business expense, so they reduce the profit your Corporation Tax is calculated on. This applies to online, POS and Tap to pay transactions alike, provided you record your sales at their gross value.
What turnover figure does HMRC expect, gross or net?
HMRC treats your turnover as the gross amount the customer paid, before card processing fees are deducted. The net payout that reaches your bank is cash received, not turnover. Posting net payouts as revenue understates your sales and can trigger late VAT registration.
How do I reconcile card payments for HMRC?
Match each payout to its full settlement report, not just the amount that lands in your bank. The difference is fees, refunds and chargebacks. Keep transaction-level reports and settlement files so you can trace any sale from the customer's card to your bank account.