American Express Chargeback Reason Code
American Express Reason Code P05: Incorrect Transaction Amount
Category Processing ErrorsBy Payment Defender Editorial TeamUpdated July 17, 2026Last reviewed July 17, 2026
What American Express Reason Code P05 Means
American Express reason code P05 applies when the amount charged differs from the amount the Cardmember agreed to pay. The dispute focuses on a discrepancy between the agreed and submitted transaction amounts.
Why This Chargeback Happens
This dispute commonly occurs when staff key an incorrect amount, when a tip or fee is added incorrectly, or when a system error alters the settled amount. Currency conversion errors can also contribute.
What the Cardholder or Issuer Is Claiming
The Cardmember is claiming the transaction amount charged does not match the amount agreed to.
What Merchants Should Review
Review the agreed amount, the receipt, and the settled amount. Confirm whether any added tip, fee, or adjustment was authorized and whether a correction is needed.
Recommended Chargeback Evidence
- Signed receipt or order confirmation showing the agreed amount
- Settlement records for the disputed transaction
- Itemized breakdown of any added fees or adjustments
- Proof of any credit issued for an overcharge
How to Prevent Similar Disputes
Merchants may reduce these disputes by verifying amounts before submission, confirming totals with customers, and reviewing tip and adjustment workflows. Accurate amount entry helps prevent incorrect-amount disputes.
Important Limitations
This page is educational and reflects common industry usage. American Express dispute rules, timelines, and evidence requirements change over time and vary by market and program. Merchants should confirm current requirements with American Express or their processor before responding to any dispute.
Related Reason Codes
Sources and Review Information
- American Express: American Express Merchant Regulations – U.S.
Last reviewed July 17, 2026
Chargeback rules, evidence requirements, and response options may vary by card network, region, processor, and dispute circumstances.