Is 4831 still a valid Mastercard reason code?

It has been consolidated into 4834 (Point-of-Interaction Error). Some processors still display 4831 in dispute interfaces for the amount-differs condition, but under current Mastercard rules the dispute is processed as a point-of-interaction error.

Can the issuer charge back only part of the transaction under this claim?

Yes. When the cardholder agrees they owed something but disputes the difference, the issuer can file for the disputed portion. Your representment should then focus narrowly on proving agreement to the incremental amount, not on relitigating the whole sale.

Mastercard · Processing Errors

Reason code 4831: Transaction Amount Differs

Legacy code 4831 covered claims that the cardholder was billed an amount different from what they agreed to pay. Mastercard consolidated it into 4834 (Point-of-Interaction Error), so amount-differs disputes now arrive under that umbrella code with the specific condition noted in the dispute detail. The substance of the claim and the evidence needed to fight it remain unchanged.

Issuer filing window

typically 90 days from the central site business date, filed under the 4834 umbrella

Merchant response window

typically 45 days to respond via second presentment

Why 4831 chargebacks happen

A receipt total was altered after the cardholder signed, such as an inflated tip or a modified line item.
Checkout displayed one price but the capture included fees, shipping, or taxes the customer says were never disclosed.
A pre-authorization for an estimated amount settled at a higher final amount without the customer's agreement to the difference.
A price change in your billing system hit an in-flight order, so the customer was charged the new price after agreeing to the old one.

How to fight a 4831 chargeback

Provide the signed receipt, checkout summary, or invoice showing the cardholder agreed to the exact amount that settled.
Include your terms showing any variable components, such as shipping calculated at fulfillment, that the customer accepted at purchase.
For amended amounts like gratuities or fuel adjustments, cite the Mastercard rule permitting the variance for your merchant category.
If only part of the amount is disputed, address the difference specifically; issuers can file this claim for the disputed portion rather than the full transaction.

How to prevent 4831 chargebacks

Show a final, itemized total including all fees and taxes on the payment confirmation step, and capture exactly that amount.
Lock order pricing at the moment of agreement so later catalog or plan changes cannot alter in-flight captures.
Send an immediate receipt email with the charged amount so discrepancies surface as support tickets instead of disputes.
For estimate-based industries, get explicit written agreement to the final amount before capture whenever it exceeds the estimate.

Frequently asked questions

Is 4831 still a valid Mastercard reason code?: It has been consolidated into 4834 (Point-of-Interaction Error). Some processors still display 4831 in dispute interfaces for the amount-differs condition, but under current Mastercard rules the dispute is processed as a point-of-interaction error.
Can the issuer charge back only part of the transaction under this claim?: Yes. When the cardholder agrees they owed something but disputes the difference, the issuer can file for the disputed portion. Your representment should then focus narrowly on proving agreement to the incremental amount, not on relitigating the whole sale.

Related Mastercard codes