Chargeback ratio: how it is calculated and what the limits are

The basic calculation is the number of chargebacks received in a month divided by the number of card transactions in a month, expressed as a percentage. If you processed 4,000 transactions and received 40 chargebacks, your ratio is 1 per cent. Some calculations compare the month's chargebacks with the previous month's transactions, because a dispute usually relates to an earlier sale; others use the same month. Your acquirer's agreement should say which method it uses.

Merchants often understate their ratio by counting only disputes they lost, or only disputes that reached the formal chargeback stage. Scheme programmes generally count disputes when they are raised, whether or not you later win them. Refunds are not chargebacks, which is why issuing a prompt refund to a customer who is unhappy is almost always cheaper than letting them dispute the payment. Track count-based and value-based ratios separately, because some programmes and some acquirers look at both.

Visa and Mastercard both run programmes that monitor merchants and acquirers whose dispute or fraud levels are high. Visa consolidated its earlier dispute and fraud monitoring into the Visa Acquirer Monitoring Program (VAMP) from 2025, which combines disputes and reported fraud into a single ratio and sets thresholds that tighten over time. Mastercard's Excessive Chargeback Program uses tiers based on both a ratio of around 1.5 per cent and a minimum monthly number of chargebacks, with a higher tier for more serious cases.

The exact thresholds, minimum counts, regional variations and fees change and are communicated to acquirers, so your acquirer is the authoritative source for what currently applies to you. What matters in practice is that acquirers set their own internal limits below the scheme thresholds, often somewhere around 1 per cent or lower, because being placed in a scheme programme costs them money and attention. Staying well under your acquirer's limit is the realistic target, not just under the scheme's.

The sequence is fairly consistent. First the acquirer's risk team notices the trend and asks for an explanation and a remediation plan. If the ratio keeps rising, you may see an increased reserve, a processing cap, higher pricing or a requirement to add fraud tools. If you enter a scheme monitoring programme, fees can be passed through to you and the acquirer will expect measurable improvement within a defined period.

If the ratio stays high, the acquirer may terminate the account. In serious cases a terminated merchant can be added to Mastercard's MATCH list, which makes it very difficult to open a new merchant account for several years. That is why ratios are best managed early. A clear written explanation of a temporary spike, for example a delivery partner failure or a fraud attack, with evidence of what you have fixed, is taken far more seriously when it is offered before the acquirer asks.

Chargebacks usually fall into three groups. True fraud is where stolen card details are used. Friendly fraud, sometimes called first-party misuse, is where the genuine cardholder disputes a payment they made, often because they do not recognise the descriptor, forgot a subscription or found cancelling difficult. Service disputes are where the customer says the goods did not arrive, were not as described or were not refunded.

Many merchants assume their problem is fraud when their reason codes show it is mostly friendly fraud and service disputes. Pull the reason codes from your processor reports and group them for the last three to six months. The distribution tells you where to act. Fraud points to screening and authentication. Unrecognised transactions point to descriptors and receipts. Subscription disputes point to billing reminders and cancellation flows. Non-delivery points to fulfilment and tracking.

Start with the cheapest fixes. Make your billing descriptor match the brand name customers know and include a support contact where the scheme allows. Send clear receipts. For subscriptions, send a reminder before each renewal and make cancellation as easy as sign-up. Publish refund terms that are easy to find and honour them promptly. Answer support messages quickly, because a customer who gets a reply rarely calls their bank.

Then add tools. Strong customer authentication such as 3-D Secure shifts liability for many fraud disputes. Dispute alert and pre-dispute resolution services, offered through the schemes and third parties, let you refund a disputed payment before it becomes a chargeback, which can keep it out of the count for some programmes. Velocity rules and address checks reduce card testing. Measure each change against your reason-code data so you can show an acquirer what improved and why.

If you are applying for a new merchant account, the underwriter will ask for recent processing statements and will calculate your ratio for themselves. Do not hide a bad period. Instead, show the monthly trend, explain what caused any spike, list the specific changes you made and show the months since. A ratio that was high and is now falling with a credible explanation is often more acceptable than a short history with no evidence at all.

Xavion Capital helps businesses prepare this kind of underwriting file and introduces them to acquirers whose risk appetite fits their profile. We do not guarantee approval and we do not help anyone disguise their business model, misstate processing history or split volume to stay under monitoring thresholds, which card scheme rules prohibit. If your ratio is currently above your acquirer's limit, the priority is remediation first and a new application second.