Why it happens
- The amount was keyed in wrongly.
- Extra charges were added after the sale without agreement.
Mastercard4831Processing error
Transaction Amount Differs
The cardholder was charged a different amount than the one they agreed to. Mastercard now files this case under 4834, but issuers and processors still report this code.
What to send to fight it
- The receipt or invoice showing the amount the cardholder agreed to.
- The cardholder’s agreement to any added charges.
- Proof a partial refund already covered the difference.
How to prevent it
- Show the final amount, taxes included, before payment.
- Get written agreement before adding any charge.
Summaries written by NoChurn from the networks’ public rules and processor documentation. Networks update their rules and deadlines depend on your processor: check its documentation before you respond.
Other Mastercard codes
- 4808Authorization-related Chargeback
- 4837No Cardholder Authorization
- 4840Fraudulent Processing of Transactions
- 4849Questionable Merchant Activity
- 4863Cardholder Does Not Recognize—Potential Fraud
- 4870Chip Liability Shift
- 4871Chip/PIN Liability Shift
- 4834Point-of-Interaction Error
- 4842Late Presentment
- 4846Correct Transaction Currency Code Not Provided
- 4853Cardholder Dispute
- 4854Cardholder Dispute—Not Elsewhere Classified (U.S. Region Only)
- 4841Cancelled Recurring or Digital Goods Transactions
- 4855Goods or Services Not Provided
- 4859Addendum, No-show, or ATM Dispute
- 4860Credit Not Processed
- 4999Domestic Chargeback Dispute (Europe Region Only)
Sources (1)
- Mastercard Chargeback Guide, Merchant Edition (19 May 2026) · checked 2026-11-09
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