Navigating the 2026 American Express Merchant Regulation Updates: A Guide for US Businesses

The Significance of the Biannual Amex Update

For United States merchants, staying compliant with card brand rules is a continuous process. Unlike other major networks, American Express operates a "closed-loop" system, meaning they often act as both the card issuer and the network American Express Chargeback Rules. This unique structure gives American Express significant control over its ecosystem, and they exercise this control through biannual updates to their Merchant Regulations, typically published in April and October American Express Merchant Policies & Procedures.

The latest release, effective as of April 2026, introduces several critical clarifications and procedural changes that impact how merchants handle transaction data, authorizations, and disputes. Failure to adhere to these updated terms can lead to increased chargeback exposure, service fees, or even the termination of the merchant agreement Terms and Conditions for American Express Card Acceptance March 2024.

Key Changes to Clearing Records and Data Retention

One of the most significant updates in the 2026 regulations involves the handling of Clearing Records. American Express has clarified the requirement for merchants to provide copies of original or electronic Clearing Records upon request American Express Merchant Operating Guide.

Retention Timeframes

Merchants must now pay closer attention to the specific retention timeframes for Charge Transactions. While standard industry practice often suggests a three-year window, Amex has refined these requirements to ensure that data is available for the duration of the dispute window, which for cardholders is generally 120 days from the transaction date American Express Chargeback Time Limits: The 2026 Guide. However, for clearing purposes, merchants are expected to maintain accessible records to satisfy audit and retrieval requests as defined in the updated Section 4.6.3.1 American Express Merchant Operating Guide.

Industry-Specific Authorization Adjustments

The April 2026 update places a heavy emphasis on the travel and entertainment (T&E) sectors. Specifically, American Express has updated the procedures for "Estimated Authorizations" and "Authorization Validity Periods" for several key industries:

• Car Rentals: Procedures for estimated authorization amounts during the rental period have been revised to better reflect actual usage and reduce the likelihood of over-authorizing or under-authorizing a customer's card American Express Merchant Operating Guide.
• Lodging and Cruise Lines: The validity period for authorizations—the length of time an approved authorization remains active before a merchant must re-authorize—has been updated for lodging, steamships, and cruise lines American Express Merchant Operating Guide.

For merchants in these sectors, these changes require an immediate review of Point of Sale (POS) and Property Management System (PMS) settings to ensure that authorization requests align with the new validity windows. Incorrectly timed authorizations can lead to "decline" responses or administrative fees.

Dispute Resolution and the Arbitration Agreement

American Express has also updated Chapter 12 of the regulations, specifically regarding the Arbitration Agreement for U.S. claims American Express Merchant Operating Guide. This clarification reinforces the legal framework through which disputes between the merchant and American Express are resolved, emphasizing the mandatory nature of arbitration for most commercial claims.

Furthermore, the process for managing disputes through the American Express Merchant Site has been refined. Merchants now have the option to view full card numbers for accounts involved in disputes, but this is no longer a default setting. To enable this view, merchants must manually contact an American Express service representative 8/27/24 AXP Internal 1. This change is likely driven by increased data privacy standards and the need to limit the exposure of Sensitive Authentication Data (SAD).

Data Security and Merchant Obligations

Compliance with the Data Security Operating Policy (DSOP) remains a cornerstone of the merchant agreement. The updated regulations reiterate that all merchants must comply with PCI DSS standards to protect cardholder data A Guide To American Express Merchant Services.

Merchants should also be aware of the "Reserve" triggers. American Express reserves the right to create a reserve account—withholding a portion of the merchant's funds—if there is a significant change in the business model or if a third party acquires 25% or more of the merchant's equity Terms and Conditions for American Express Card Acceptance March 2024. Keeping Amex informed of corporate structural changes is vital to avoiding unexpected cash flow disruptions.

Merchant Recommendations

To ensure continued compliance and optimize your American Express acceptance, ONKORE recommends the following actions:

• Audit Data Retention Policies: Verify that your systems are retaining Clearing Records in accordance with the clarified timeframes in Section 4.6.3.1. Ensure these records are easily retrievable in electronic format.
• Update T&E POS Logic: If you operate in the lodging, car rental, or cruise industries, work with your payment processor to update authorization validity periods and estimated charge logic to match the April 2026 standards.
• Review Surcharging Rules: Remember that while Visa and Mastercard settlements have changed the landscape, American Express still requires merchants to specifically opt-in to surcharging programs in the U.S. B2B Credit Card Surcharges in 2026: State-by-State Rules and More | Centime.
• Enable Dispute Visibility: If your internal fraud or accounting teams need full card numbers to reconcile disputes, call the US Servicing Number to request access, as this is no longer enabled by default.
• Monitor Corporate Changes: If your business is undergoing a merger, acquisition, or significant change in ownership (25%+), notify American Express proactively to manage potential Reserve requirements.

ONKORE Perspective

The latest updates from American Express signal a move toward greater operational precision, particularly in high-volume T&E sectors. By clarifying authorization windows and clearing record requirements, Amex is attempting to reduce friction in the dispute process and minimize "stale" authorizations that tie up consumer credit lines. For merchants, these updates represent a double-edged sword: while they provide clearer rules of engagement, they also place a higher burden on technical compliance and data management. At ONKORE, we view these changes as a reminder that the "closed-loop" nature of Amex requires a more hands-on management style compared to the more standardized Visa/Mastercard rules. Proactive adjustment of your POS logic today will prevent costly administrative downgrades and dispute losses tomorrow.

American Express has released its latest Merchant Regulations. Learn how new clearing record rules and authorization windows impact your business operations.