How to Dispute an American Express Charge

The two clocks, honestly labeled

Clock 1 — federal law (FCBA, 15 U.S.C. 1666): 60 days after the statement was sent. If you send a written billing-error notice — your name and account number, the charge and amount, and why it is wrong — within 60 days after the statement containing the error was sent, Amex must acknowledge it in writing within 30 days and resolve it within two complete billing cycles, not to exceed 90 days. While the dispute is pending, Amex may not collect the disputed amount or report it delinquent. This clock governs your federal rights, and it is a written-notice clock: an online "Dispute this Charge" click opens the Amex case but is not, by itself, the FCBA notice.

Clock 2 — Amex's network allowance: up to 120 days from the transaction date. For most reason codes, Amex's merchant dispute rules allow a dispute up to 120 days from the transaction date, as published in processor dispute-timeframe tables (Adyen) and corroborated across merchant guides. This clock governs whether Amex will still open the case. It is not federal law, and Amex's own merchant page confirms an important exception: for goods/services not received, goods/services returned or canceled, and redisputes, the timeframe can extend slightly — so for those categories, treat the 120-day date as an earliest-safe date, not a guaranteed last day, and file as soon as you can.

Which governs what: satisfy the earlier of the two whenever possible. If the FCBA window has passed but the Amex window is open, file anyway — the Amex case can still proceed, but the federal written-notice protections may be lost. If both have passed, file anyway with your strongest evidence and ask Amex to confirm in writing whether it will still open the case. And for fraud, neither clock is a reason to wait: report at once.

Closed loop: file with Amex directly

With Visa or Mastercard, a dispute passes from you to your issuing bank, then to the network, then 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. You file with Amex itself, and Amex decides the case. Amex says it works directly with the cardmember first and can often clear a dispute up without contacting the merchant at all. The practical consequence: Amex's own terms are the final word on your case, so read the dispute section of your cardmember agreement — it governs over any guide, including this one.

How to file, step by step

1. Run the quick checks first. Search the merchant name online — it may be a parent company or a different trading name. Check your email for an order confirmation, check whether the charge is a monthly or yearly subscription you forgot, and check the exchange rate if the amount looks off. Amex's own checklist says these checks often resolve an apparent mistake or rule out attempted fraud.
2. Contact the merchant first — for merchant disputes only. Amex's US help page says: "Before you open a dispute, please first contact the merchant directly." Amex's UK help page warns it may ask for proof you contacted the merchant. Do it in writing, state exactly what is wrong and what you want, and save the reply or proof you tried. For fraud, skip this step entirely and report to Amex at once.
3. Wait for the charge to post. Pending transactions cannot be disputed. Amex recommends allowing about four business days for the charge to appear in Processed Transactions, then filing from the posted transaction.
4. File online with Amex. Sign in, go to statement activity, select the transaction, and choose "Dispute this Charge". Follow the on-screen prompts, answer exactly, and upload your evidence with the filing — not later. Save the case number and the date you filed. You can also file by phone using the number on the back of your card, or by chat in your online account.
5. Send the FCBA written notice too (US cards). A letter or secure message identifying your account, the charge, the amount, and why it is wrong, sent within 60 days after the statement was sent. By certified mail with return receipt if you mail it, so you can prove when Amex received it. This is the step that triggers the federal duties — do not skip it because the online filing felt complete.
6. Track the case and answer promptly. Follow your case in your disputes activity. If Amex asks for supporting documentation, answer promptly and completely — a thin or late reply is how winnable cases are lost.

Evidence that decides each dispute type

• Fraud (F24, F29). Proof you did not authorize it: the merchant-name check, confirmation no authorized user made it, and the date you first noticed it. Amex's Fraud Protection Guarantee states a cardmember who took reasonable care is not held responsible for fraudulent charges.
• Wrong amount / duplicate (P05, P08). The agreed price next to what was billed, plus proof of any partial refund already given.
• Not received (C08). The order confirmation with the promised delivery date, tracking showing it never arrived, and your messages asking where it is. The delivery date also matters for your window (see above).
• Not as described / damaged (C31, C32). Screenshots of the listing as it looked when you paid, photos of what arrived, and your messages with the seller.
• Returned / cancelled, no credit (C04, C05). Return tracking or the cancellation confirmation, and statements showing no credit appeared.
• Subscription kept billing (C28). The cancellation confirmation and every statement showing charges after cancellation.

You file in plain language; Amex assigns the code. The codes above are the merchant-side codes Amex uses, included here only because three independent processor/merchant references agree on them — if a code appears on an Amex letter, it tells you which family your case is in and what evidence decides it.

Behind the scenes: the merchant's 20-day clock

If Amex does contact the merchant, it does so in one of two ways: an inquiry (a request for information, with no debit attached) or an upfront chargeback (your account is debited first, and the merchant must argue for a reversal). Either way, the merchant has 20 days to respond with evidence. If the merchant replies on time with sufficient information, there is no chargeback (inquiry) or a reversal follows (chargeback); if not, the chargeback stands. You cannot control this clock — but it is why a complete evidence packet at filing beats a fast but thin one: your evidence is what Amex weighs against the merchant's 20-day reply.

While you wait: payment and timeline

Amex's resource center says the disputed amount is removed from your required payment due until the matter is resolved, and that most disputes are resolved within a month, though complex cases take longer. Amex's UK help page says investigations can take up to 6-8 weeks. Both figures are stated here because the sources disagree — treat neither as a promise, track your case online, and follow up in writing if the timeline slips badly.

If Amex says no: the appeal ladder

1. Ask Amex to reconsider with new evidence. A clearer photo, the full listing, a delivery record you did not have before. Merchant guides report cardholders are generally limited to two disputes per charge — make the second filing your strongest packet, not a repeat of the first.
2. Use the FCBA notice if the window is still open. Inside 60 days after the statement was sent, a certified-mail written notice independently forces a written acknowledgment within 30 days and a resolution within two complete billing cycles, not to exceed 90 days.
3. File a CFPB complaint. At consumerfinance.gov/complaint — the Consumer Financial Protection Bureau forwards it to Amex, which must respond. Keep every letter, case number, and date.

Sources

Sources (verified October 29, 2026): American Express US help — "How to Dispute an American Express Charge" (americanexpress.com) — the contact-the-merchant-first instruction and the online filing flow; American Express UK help — "How do I dispute a charge" — the pre-filing checklist, 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 routes; American Express merchant page — "Manage Merchant Disputes & Chargebacks" (americanexpress.com) — the merchant's 20-day inquiry/chargeback response window, the work-directly-with-the-cardmember-first process, and the footnote that the filing timeframe can extend slightly for not-received, returned/canceled, and redispute categories; Adyen Docs dispute-timeframes table, Chargeflow, Chargebacks911, and Sift merchant references — the 120-day-from-transaction allowance and the C/F/P reason-code families; American Express Fraud Protection Guarantee (americanexpress.com) — the reasonable-care fraud protection statement; American Express @Work resource center (americanexpress.com) — most disputes resolved within a month, disputed amount removed from required payment due; FCBA, 15 U.S.C. 1666 (uscode.house.gov) — the 60-day written notice, 30-day acknowledgment, two-billing-cycle/90-day resolution, and $50 federal liability cap. Your cardmember agreement is the final word on your account.

Open the American Express Dispute Navigator