Amex Reason Code P05: Incorrect Charge Amount

What Amex reason code P05 means

P05 means the Card Member agrees they made the purchase, but says you charged the wrong amount. Typical claims: the total was higher than the receipt, a promised discount or coupon wasn’t applied, a tip was altered, or fees appeared that weren’t disclosed.

It differs from A01, which is about the charge exceeding the authorized amount. P05 is about the charge differing from the amount the Card Member agreed to, whether or not it was authorized.

Common causes

• Post-purchase upsells the customer doesn’t remember accepting
• Shipping, handling or “processing” fees added after the displayed total
• Coupons or promotional prices that failed to apply
• Currency conversion that changed the amount (see P23)
• Keying errors on phone orders or in-store terminals

Evidence that wins a P05 dispute

1. Itemized order with every line, discount, tax and shipping charge, and the final total.
2. Proof of acceptance: the checkout or order-confirmation screen showing that total, with timestamp.
3. Upsell acceptance: for funnel upsells, the screen and click record showing the Card Member chose the add-on.
4. Fee disclosure: where fees or shipping were added, proof they were displayed before purchase.
5. Authorization and capture records showing the charged amount matches the order.
6. Customer communication about the amount, if any.

Upsell and fee disputes

In checkout funnels, many P05s come from post-purchase offers. The Card Member remembers the price of the main product, sees a larger total on their statement, and disputes the difference. The best evidence is the upsell page they saw and a click record of the acceptance, plus a receipt that lists the add-on as its own line. If the upsell was charged separately, say so, and point to that charge’s own receipt.

How to prevent P05 disputes

• Show the full total, including shipping and fees, before the purchase button.
• Send an itemized receipt immediately, including any upsells as separate lines.
• Test coupon and promo logic on each release.
• For phone orders, read back the total and send an emailed confirmation.

Partial refunds

If part of the claim is valid, for example a coupon that should have applied, consider crediting that portion during the inquiry stage and defending the rest with the itemized order. A clear, partial resolution is often easier for Amex to accept than an all-or-nothing response.

Should you fight or accept?

Fight when the charged amount matches an itemized total the Card Member accepted, including disclosed fees and confirmed upsells.

Accept when a discount didn’t apply, a fee wasn’t disclosed, or the amount was mis-keyed. Then fix the pricing or checkout display that caused it.