Chargeback Response Deadlines: Why Visa and Mastercard Count the Clock Differently

A missed chargeback response deadline doesn't get you a warning or a second look — it resolves the dispute automatically in the cardholder's favor. The merchant loses the funds, eats a chargeback fee, and takes a hit to their dispute ratio, regardless of whether the original claim had any merit. Knowing the actual deadline, not an assumed one, is the entire game.

Visa: 30 days, counted from the day after notification

Visa's dispute process generally gives merchants 30 days to respond at each phase, with the count starting the day after that phase begins — typically the day after the acquiring bank forwards the case. Each phase of an escalating dispute (first chargeback, representment, arbitration) can carry its own 30-day window, and an arbitration request specifically must go out within 10 days if either side wants to escalate that far.

Mastercard: 45 days, but the clock starts earlier than you'd expect

Mastercard allows a longer 45-day response window per stage — but unlike Visa, it starts counting from the date of the original transaction, not the date the merchant is notified. Combined with any lag between the transaction, the chargeback being filed, and the acquirer forwarding the case to the merchant, the real number of days a merchant actually has to prepare a response can be meaningfully shorter than "45 days" suggests at first glance.

The network deadline is rarely the real deadline

Here's the detail that catches merchants off guard most often: acquiring banks and payment processors almost universally set their own, shorter internal deadlines — sometimes as little as 5 to 10 days — so they have time to review, package, and submit a merchant's response before their own cutoff with the network. A merchant who checks only the Visa or Mastercard rule and assumes they have the full 30 or 45 days can discover, too late, that their processor's actual portal deadline passed weeks earlier.

Always treat the deadline shown in your specific dispute-management portal as authoritative over any general network rule — the network figure is a ceiling your processor is allowed to shorten, not a floor they're required to honor.

American Express and Discover run their own timelines

Amex and Discover both operate their own dispute processes, generally with different (often shorter) windows than Visa or Mastercard. If a chargeback arrives on one of these networks, don't apply Visa or Mastercard timing by default — check the specific network's stated deadline in the dispute notice itself.

Sanity-check your deadline before you assume you have time

The Chargeback Response Deadline calculator takes the date a chargeback notice was received and the card network involved, and returns the standard network response window — along with a caution to verify against your acquirer's own portal deadline, which is very often shorter. Use it as a first check, not a final answer, and always defer to whatever your processor's dispute system actually states.