Card Machine Chargebacks UK: A Merchant Guide to Disputes

The first chargeback usually arrives as a surprise: a letter or dashboard notification saying a payment you took weeks ago has been disputed, the money has already been deducted, and you have until a printed date to respond. None of that is the provider being difficult. It is the card schemes’ standard dispute machinery, it runs the same way on every provider, and once you understand the flow you can make a calm commercial decision on each dispute instead of an indignant one.

What a chargeback actually is

When a customer pays by card, the payment can be unwound later through the card scheme if the cardholder disputes it with their bank. Common triggers on a card machine: the customer does not recognise the payment on their statement, they were charged twice, the amount is wrong, they claim they never received what they paid for, or the card was used fraudulently. The customer’s bank raises the dispute through Visa or Mastercard, and it lands on your acquirer, who passes it to you. Note what this means: the customer does not ask you first, and by the time you hear about it the money is already on its way back.

The flow, from your side of the counter

The dispute is raised. The cardholder contacts their bank, which files a chargeback with a reason code describing the claim.
Your provider debits you. The disputed amount is deducted from your settlement or balance, and most providers add a chargeback fee, typically £15 to £25 per dispute, which is charged whether or not you eventually win. Our hidden fees guide covers where this fee sits among the other charges on your statement.
You get a notification and a deadline. It states the amount, the reason code, what evidence is wanted, and the date by which you must respond. That date is the whole game: miss it and you lose by default.
You respond, or accept. Accepting ends it, and the customer keeps the money. Responding (called representment) sends your evidence back through the scheme for a decision.
Decision. If your defence succeeds, the disputed amount is returned to you. The chargeback fee usually is not. If it fails, the money stays with the cardholder.

How to respond with evidence

Match the evidence to the claim, because a beautiful bundle that ignores the reason code loses to three relevant documents that address it.

“Fraud” or “I did not authorise this” on a card-present sale: the transaction receipt showing chip and PIN or contactless. The card, or a device carrying it, was physically present and verified, which is the strongest position a merchant can hold.
“Goods or services not received”: proof of delivery or collection, a signed job sheet, a booking the customer attended, CCTV-corroborated collection if you have it, or correspondence showing the service was performed.
“Not as described” or quality claims: the itemised receipt, your displayed refund policy, photographs, and any exchange with the customer where you offered to put it right.
“Duplicate” or wrong amount: your till record or transaction log showing the sales are distinct, or that the amount matches the receipt.

Send it through the channel the notification specifies, before the deadline, and keep a copy of everything. Time limits in the dispute system are scheme-set, vary by network and reason code, and are short; the only safe assumption is that the date printed on your notification is real and unmovable.

The arithmetic of fighting versus refunding

Run the numbers before you run the defence. Take a disputed £20 sale with a £20 chargeback fee. If you fight and win, you recover the £20 but typically still pay the fee, so you are roughly at £0 for an hour of paperwork. If you fight and lose, you are down £20 + £20 = £40 plus the hour. If the customer had come to you first and you had simply refunded, you would be down £20 and no fee, with a customer who might come back. Now run the same numbers on a £600 sale with solid delivery evidence: winning recovers £600 against a £15 to £25 fee, which is absolutely worth the hour. The rule that falls out: refund small and weak, fight large and strong, and make it easy for unhappy customers to reach you before their bank, because a refund conversation is always cheaper than a dispute.

Preventing chargebacks in the first place

Fix your billing descriptor.A statement line reading a holding-company name your customers have never heard of is the single most preventable cause of “I do not recognise this payment”. Ask your provider what your descriptor says and change it to your trading name.
Give receipts, itemised where you can. A customer holding a receipt rarely disputes the amount, and the receipt is your evidence if they do.
Keep proof of handover. Delivery confirmations, signed job sheets, collection signatures. For tradespeople, a dated photo of completed work alongside the invoice does real work in a dispute.
Display your refund policy at the till and on receipts, and honour it quickly. Banks ask disputing customers whether they contacted the merchant first; being easy to reach wins you the dispute before it exists.
Void duplicates on the spot. If a payment double-charges in a signal drop, reverse it immediately and tell the customer, rather than waiting for their statement to tell them. Our guide to customers charged when the terminal said declined covers that specific mess.

The honest part: chargebacks and account holds

Providers do not just process chargebacks, they measure them. Acquirers watch each merchant’s dispute rate because the schemes hold the acquirer responsible for merchants whose disputes run high, and the expected level is a small fraction of one percent of transactions. A merchant who drifts above the norm can meet consequences that arrive with little warning: higher fees, settlements held back, a rolling reserve, or in the worst case a terminated account, which other acquirers can see. If your takings have already stopped arriving on time, our guide to card machine money not reaching your bank explains the difference between a settlement delay and a genuine hold, and what to ask your provider. The point of this section is not to alarm: a typical shop or cafe with a handful of disputes a year is nowhere near any threshold. It is to make the priority clear: preventing the next five chargebacks matters more than winning the last one.

Frequently asked questions

What is a chargeback on a card machine?

A chargeback is the dispute mechanism run by the card schemes. Your customer asks their bank to reverse a payment, the bank raises a dispute through the card scheme, and your payment provider takes the disputed amount back out of your settlement, usually adding a chargeback fee of £15 to £25 per dispute. You then get a chance to defend the payment with evidence, and if your defence succeeds the money comes back.

How long do I have to respond to a chargeback?

Not long, and the exact deadline depends on the card scheme and the dispute reason, so treat the date on the notification from your provider as the only one that matters. Windows are typically measured in days or a few weeks, not months, and a missed deadline usually means an automatic loss regardless of how good your evidence was. Open chargeback notifications the day they arrive.

What evidence wins a chargeback dispute?

Evidence that answers the specific reason code. For card-present payments, the receipt showing chip and PIN or contactless was used is strong, because the cardholder or their card was demonstrably there. Beyond that: an itemised receipt, proof of delivery or collection, signed paperwork or booking confirmations, your refund policy as displayed at the point of sale, and any correspondence with the customer. Send what the notification asks for, on time, and keep copies.

Should I fight every chargeback?

No. Weigh the disputed amount against the fee and your time. If the sale was £20 and the chargeback fee is £15 to £25, even a win recovers £20 while a loss costs the £20 plus the fee, so a proactive refund before a dispute is raised is often the cheaper outcome. Fight the ones where the amount is meaningful and your evidence is strong; refund fast where it is not.

Can too many chargebacks get my merchant account closed?

Yes. Providers and card schemes monitor chargeback rates, and a merchant whose disputes climb above the low fractions of a percent the schemes expect can face higher fees, held settlements, rolling reserves, or account termination. If you have had a cluster of chargebacks, fix the cause (descriptor, receipts, delivery proof, refund policy) before it becomes an account problem, because a held account hurts far more than the disputes themselves.

Chargebacks for UK merchants: what happens, what it costs, and which ones to fight