A chargeback is a payment reversal that a cardholder's bank initiates on their behalf, rather than something the merchant agrees to. The issuer pulls the disputed funds back from the merchant's acquirer immediately, and the merchant then has a fixed window to accept the loss or contest it with evidence.

Chargebacks are not the same as refunds. A refund is a merchant decision, made directly with the customer, with no bank involved and no deadline attached. A chargeback runs on card scheme rules instead: the issuer decides, the acquirer administers it, and the clock starts the moment the cardholder raises the dispute. That difference is why a chargeback shows up on a merchant's dispute rate even when the underlying complaint turns out to be unfounded.

How does a chargeback work?

A chargeback moves through four stages, and each one hands control to a different party. The cardholder raises a dispute with their issuer, not with the merchant, usually through their banking app or by phone. The issuer assigns a reason code, debits the merchant's acquirer, and credits the cardholder provisionally while the case is open. The merchant then either accepts the chargeback as correct, or represents it: supplying evidence that contests the specific reason code assigned. If the issuer accepts that evidence, the funds move back to the merchant. If it does not, and the merchant still disagrees, the case escalates to arbitration, where the card scheme itself makes the final call and the losing side absorbs the cost of being wrong. Each stage runs to its own deadline, set by the scheme rather than negotiated between the parties, and the evidence a merchant needs at the representment stage follows directly from the reason code the issuer assigned at the outset.

What's the difference between a chargeback and a refund?

A refund is an agreement between the merchant and the customer: the merchant decides to return the money, with no bank involved and no fixed deadline. A chargeback removes that choice entirely. The cardholder goes straight to their issuer, the issuer debits the merchant's acquirer immediately, and the merchant only gets a say once the money has already moved, through representment. The practical effect reaches beyond the individual case. A chargeback counts against a merchant's dispute rate and can flag the account for a card scheme monitoring programme, while a refund processed before a dispute is ever raised generally does not. Those programmes measure how many disputes a merchant attracts, not how many it goes on to win, so a merchant that represents every chargeback successfully can still trigger monitoring if the underlying dispute volume stays high. Preventing a chargeback is worth more than winning one.

What happens when a merchant disputes a chargeback?

A merchant that disagrees with a chargeback can represent it: supplying the specific evidence the reason code calls for, such as proof of delivery, a signed authorisation, or a cancellation record, within the response window the scheme sets. The issuer reviews that representment and either returns the funds to the merchant or lets the chargeback stand. If the merchant still disagrees at that point, the case can move to pre-arbitration and then arbitration, where the card scheme itself rules on the dispute and both sides typically pay a scheme fee regardless of which one wins. Because the evidence required differs by reason code family, from a delivery record for a goods-not-received claim to a signed authorisation for a disputed authorisation, misclassifying the dispute at the outset is one of the most common ways a winnable case ends up lost before the evidence is even gathered.

Why are chargebacks hard to manage at volume?

Every chargeback runs on the same fixed pattern: a specific reason code, a specific evidence requirement, and a hard deadline that does not move for a backlog. That combination is straightforward to handle case by case and difficult to handle at scale, because a disputes team has to classify the reason code correctly, gather the matching evidence, and file it inside the window for every case, with no allowance for a busy week. Missing any one of those steps loses the case regardless of whether the underlying transaction was legitimate. It is also why the process suits automation well: the rules are fixed, the evidence requirements are repeatable by reason code, and the deadline is known from the moment the dispute arrives, even though the judgment calls at arbitration still need a person. See how to automate disputes with AI for how that fits into the wider dispute workflow.

Frequently asked questions

Who sets the chargeback response window, and can it be extended?

The card network sets the deadline as part of the reason code rules, not the merchant, the acquirer, or the courts, and it is not negotiable case by case. A merchant that misses it loses the chargeback by default, even when the underlying evidence would have won the case outright.

Who pays for a chargeback?

The merchant bears the cost by default: the disputed funds leave their account as soon as the issuer debits the acquirer, before any evidence is reviewed. If the merchant successfully represents the case, the funds return. If arbitration is needed instead, both the merchant and the cardholder's bank typically pay a scheme fee regardless of which side wins.

Is every chargeback the result of fraud?

No. Fraud is only one of several reason code families a chargeback can fall under, alongside authorisation errors, processing errors, and consumer disputes such as goods not received. A cardholder who has simply forgotten a subscription can still end up coded as fraud, which is one reason disputes teams treat the reason code, not the cardholder's own description, as the starting point for classification.

Can a chargeback be reversed after the merchant wins?

Only through the scheme's formal process. If an issuer accepts a merchant's representment, the case is settled and the cardholder cannot simply raise the same dispute again. If the cardholder's bank still disagrees, the only route left is arbitration, where the card scheme rules and the losing side pays the arbitration fee on top of whatever the dispute itself was worth.