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Network

Amex

Code

A01

Response window

20 calendar days

Win difficulty

Medium

Dispute type

Authorization

Amex A01 — Charge Amount Exceeds Authorization: What It Is and How to Respond

⚠️ 20-Day Deadline: American Express gives you only 20 calendar days to respond — shorter than Visa (30 days) or Mastercard (45 days). Act within 48 hours of receiving notification.

Amex A01 is triggered when the amount settled to the cardholder’s account exceeds the amount that was originally authorized. Every Amex transaction must be settled for an amount that matches (or is within tolerance of) the authorized amount. If the settled amount is higher than the authorization, A01 follows.

The most common cause in card-present environments is tips added after authorization — a restaurant charges $80 at the table, the customer adds a $20 tip on the paper receipt, and the settlement of $100 exceeds the $80 authorization. Amex allows a tip tolerance (typically 20% above the original authorization for food service), but exceeding this tolerance triggers A01. For e-commerce, A01 is usually a system error — the settlement amount was modified after authorization was obtained.

Common reasons you received this dispute

  1. 1A tip was added after authorization that exceeded Amex's allowable tolerance
  2. 2A system error changed the settlement amount between authorization and settlement
  3. 3A price adjustment or add-on was applied after the initial authorization
  4. 4Authorization was obtained for a partial amount (deposit) but the full amount was settled
  5. 5Hotel or rental charges exceeded the authorized hold amount

Can you win this dispute?

Fight this dispute if...

  • ✓The settled amount matches the authorized amount and there's no discrepancy — the dispute was filed in error
  • ✓For tips: the customer signed a receipt showing the exact amount settled
  • ✓The settled amount is within Amex's allowable tolerance for the transaction type

Accept this chargeback if...

  • ✗The settlement genuinely exceeded the authorization by more than the allowed tolerance
  • ✗You processed a higher amount than what was originally agreed

Evidence checklist

  1. ✅ Required

    Authorization record showing the authorized amount and approval code.

  2. ✅ Required

    Settlement record showing the amount settled.

  3. ⭐ Strongly recommended

    Signed receipt showing the amount (including tip if applicable) that the cardholder agreed to.

  4. ○ If available

    For tips: the cardholder-signed tip slip showing the customer entered the tip themselves.

How to write your response

“We are writing to dispute Amex chargeback [reference] under reason code A01. The settlement amount of [amount] is within Amex’s allowable tolerance of the authorized amount of [amount]. Exhibit A is the authorization record. Exhibit B is the signed receipt showing the cardholder accepted the total amount of [amount]. We respectfully request reversal of this chargeback.”

Key deadlines

Response window: 20 calendar days from the notification date. Act within 48 hours — do not wait.

Amex’s 20-day window is shorter than Visa (30 days) or Mastercard (45 days). Prioritize Amex disputes accordingly.

How to prevent this chargeback

  1. 1

    Use Tip Adjust for tip transactions: Use Tip Adjust functionality that obtains a new authorization for the total including tip, rather than adjusting the settlement above the original authorization.

  2. 2

    Set holds at the maximum for hotels and car rentals: Ensure hold authorizations are set to cover the maximum likely charge, not just the base rate.

  3. 3

    Reconcile authorization vs settlement amounts daily: Catch overages before they become chargebacks.

  4. 4

    Re-authorize when the final amount is known: For any transaction where the amount might change after authorization (estimates, open tabs), obtain a new authorization when finalizing the amount.

Frequently asked questions

What is Amex A01?

Amex A01 is triggered when the settlement amount exceeds the original authorization. The most common triggers are tip additions above Amex's tolerance, system errors that modify the settlement amount, and hotel/rental charges that exceed the authorized hold.

What is Amex's tip tolerance?

Amex generally allows tip additions up to a certain percentage above the authorized amount for food and beverage merchants (similar to the 20% tolerance used by other networks), but the specific tolerance can vary by merchant agreement. Exceeding the tolerance triggers A01. Use Tip Adjust or re-authorization to be safe.

Can I fight Amex A01 if the cardholder signed for the tip?

Yes. A signed receipt showing the cardholder wrote in the tip themselves and the total matches the settled amount is strong evidence. Include the signed receipt alongside your authorization and settlement records.

How is A01 different from Amex P05?

A01 covers the amount exceeding the authorized amount — too much was settled vs the authorization. P05 (Incorrect Charge Amount) covers a discrepancy between the amount agreed to and the amount charged. A01 is an authorization mismatch; P05 is an agreement mismatch.

Related reason codes

Amex P05

Incorrect Amount

Amex A02

No Valid Authorization

Visa 12.5

Incorrect Amount

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