How the rules work
The two clocks: FCBA 60 days vs Amex 120 days
These are two different clocks, set by two different authorities, and they govern two different things — never blend them. The FCBA clock is federal law: under 15 U.S.C. 1666, a cardholder who sends a written billing-error notice within 60 days after the statement was sent forces the creditor to acknowledge in writing within 30 days and resolve within two complete billing cycles, not to exceed 90 days. The Amex clock is Amex's own network allowance: up to 120 days from the transaction date for most reason codes, as published in processor dispute-timeframe tables and Amex's merchant dispute rules. The FCBA clock governs whether your federal rights attach; the Amex clock governs whether Amex will still open the case. File inside both whenever possible — the earlier date governs your plan.
| Clock | Who sets it | The rule |
|---|
| FCBA written notice — 60 days | Federal law (15 U.S.C. 1666) | Written billing-error notice within 60 days after the statement was sent; acknowledgment within 30 days; resolution within two complete billing cycles, not to exceed 90 days |
| Amex filing allowance — 120 days | Amex network rules (merchant-guide published) | Up to 120 days from the transaction date for most reason codes; the timeframe can extend slightly for goods/services not received, returned or canceled, and redisputes — americanexpress.com (merchant disputes) |
| Merchant response — 20 days | Amex merchant rules | If Amex contacts the merchant with an inquiry or an upfront chargeback, the merchant has 20 days to answer with evidence — americanexpress.com |
| Investigation | Amex help-centre guidance | Most disputes resolved within a month, complex cases longer (Amex resource center); UK help says investigations can take up to 6-8 weeks — resolution time, not a filing window |
Closed loop: why Amex disputes work differently
With Visa or Mastercard, your dispute travels from you to your issuing bank to the network to the merchant's bank. With American Express, for most of its cards Amex is both the network and the issuer — one company, one process, one set of rules. That is simpler, and it is also why Amex's own terms are the final word on your case: there is no second institution to appeal to inside the process. It is also why Amex can resolve many disputes without ever contacting the merchant — Amex says it works directly with the cardmember first and often clears the dispute up without reaching out to the merchant at all.
Contact the merchant first — for merchant disputes, not fraud
Amex's US help page is blunt: "Before you open a dispute, please first contact the merchant directly." Amex's UK help page adds that Amex may ask you for proof that you contacted the merchant in an effort to resolve the dispute. That rule applies to merchant disputes — authorized charges gone wrong. It does not apply to fraud: if you never authorized the charge, do not negotiate with a merchant you never dealt with; report it to Amex at once. The navigator applies the step exactly that way, and the distinction is the single most common Amex filing mistake.
Why pending charges cannot be disputed yet
A pending transaction cannot be disputed because the amount may change or the transaction may never fully post. Amex recommends allowing about four business days for the charge to appear in Processed Transactions before raising the dispute. Use the wait: contact the merchant in writing for a merchant dispute, or report fraud to Amex at once for an unauthorized charge. File from the posted transaction, never the pending one.
Reason codes: what Amex assigns behind the scenes
You file in plain language; Amex assigns a merchant-side reason code. The families are C (cardmember disputes: C31 not as described, C32 damaged or defective, C08 not received, C02 credit not processed, C04 returned or refused, C05 canceled, C28 cancelled recurring billing), F (fraud: F24 no cardmember authorization, F29 card-not-present fraud), and P (processing errors: P05 incorrect amount, P08 duplicate charge). You never need to quote a code to file — but if a code appears on an Amex letter, it tells you which family your case is in and what evidence decides it. Read the full breakdown in how to dispute an American Express charge — the complete guide.
If Amex says no: the appeal ladder
Ask Amex to reconsider with new evidence — merchant guides report cardholders are generally limited to two disputes per charge, so make the second filing your strongest packet. If you are still inside 60 days after the statement was sent, send the FCBA written notice by certified mail: it independently forces a written acknowledgment within 30 days. Finally, file a complaint with the Consumer Financial Protection Bureau at consumerfinance.gov/complaint, which Amex must answer.
Want the full American Express playbook?
The two clocks explained, the closed-loop process step by step, evidence checklists per dispute type, the merchant's 20-day clock, and the appeal ladder — with the navigator above the fold.
Read the American Express dispute guide
Sources (verified October 29, 2026): American Express US help — "How to Dispute an American Express Charge" (americanexpress.com) for the contact-the-merchant-first instruction and the online filing flow (select the transaction, "Dispute this Charge"); American Express UK help — "How do I dispute a charge" for the pending rule (about four business days to Processed Transactions), the proof-of-merchant-contact warning, the 6-8-week investigation figure, and the online/chat/phone filing routes; American Express merchant page — "Manage Merchant Disputes & Chargebacks" for the merchant's 20-day inquiry/chargeback response window and the footnote that the filing timeframe can extend slightly for not-received, returned/canceled, and redispute categories; Adyen Docs dispute-timeframes table plus Chargeflow, Chargebacks911, and Sift merchant references for the 120-day-from-transaction allowance and the C/F/P reason-code families; American Express Fraud Protection Guarantee (americanexpress.com) for the reasonable-care fraud protection statement; FCBA, 15 U.S.C. 1666 (uscode.house.gov) for the 60-day written notice, 30-day acknowledgment, two-billing-cycle/90-day resolution, and $50 federal liability cap. Prepared by Muhammad Umer, founder of Chargeback Clock. Your cardmember agreement is the final word.
General information only — not legal advice. American Express's terms change and your cardmember agreement governs your dispute. Verify deadlines with American Express and, for federal rights, the FCBA text itself.
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