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Start by identifying what is actually unauthorized. If you made the purchase but a merchant added a fee you did not agree to, describe the problem as an incorrect amount, missing disclosure, or potentially unlawful surcharge—not automatically as fraud. If you did not authorize the card transaction at all, report suspected unauthorized use to the issuer immediately. For a qualifying credit-card billing error, send a written notice to the issuer’s billing-inquiries address so it arrives within 60 days after the first statement containing the error was sent. You can contact the merchant too, but a merchant conversation must not delay that deadline.
This guide applies to a U.S. consumer credit-card transaction. State, local, federal, and card-network rules can differ by transaction location, payment type, merchant channel, and date. Debit-card and prepaid-card procedures are not the same as the federal credit-card billing-error process described here.
First decide which dispute you have
The word “unauthorized” can describe two different problems. The correct classification determines whom to contact, what evidence matters, and which deadline applies.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minute| Situation | What happened | How to describe it | Immediate action |
|---|---|---|---|
| Unauthorized transaction | You did not authorize the underlying card use. | Suspected unauthorized use or fraud. | Contact the issuer immediately, follow its security instructions, and ask how to block or replace the card. |
| Authorized purchase, wrong amount | You used the card, but the statement or receipt shows more than the amount agreed. | Billing error: incorrect amount. | Collect the receipt and price evidence and use the written billing-error process if the issuer does not correct it. |
| Authorized purchase, disputed surcharge | You made the purchase but object to a fee because it was not disclosed, was calculated incorrectly, or may violate applicable law or network rules. | Disputed surcharge or undisclosed fee. | Ask the merchant to explain or refund it while preserving the right to send a timely issuer notice. |
Whether card use was legally authorized can depend on applicable law. Do not call an authorized purchase “fraud” merely because the fee was unexpected. State the precise mismatch: for example, “The posted price was $100, the receipt showed a $100 total, and the statement added a $4 surcharge that was not disclosed before payment.”
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What a surcharge is—and why legality is fact-specific
A surcharge is an extra amount associated with paying by card. A merchant might label it a “credit-card fee,” “service fee,” “convenience fee,” or something else. The label alone does not determine legality. The relevant facts include:
- Whether the transaction used a credit card, debit card, or prepaid card.
- Where the merchant and transaction were located, including any applicable local rule.
- Whether the fee was disclosed before you committed to payment and where that disclosure appeared.
- Whether a viable payment method without the fee was available.
- The fee’s dollar amount and percentage compared with the stated price and the merchant’s cost of acceptance.
- The transaction date and the law and network rules in force then.
- Whether the merchant’s checkout channel—online, in-store, telephone, or another channel—changed the disclosure requirements.
A surcharge is not automatically unlawful throughout the United States. Visa states that credit-card surcharging is permitted in most U.S. states subject to legal and network limitations. Its merchant Q&A described its understanding of state-law requirements as of February 15, 2024; that dated summary is not a current legal survey. Check the law in force for the transaction’s location and date before asserting that a particular fee was illegal.
Federal price-disclosure principles
Federal Trade Commission fee guidance says a business may charge or pass through payment-processing fees when otherwise permitted by law. When another viable payment method without a fee exists, the FTC describes the card fee as optional for its total-price analysis, but the business still must disclose it and include it in the final amount before asking for payment; it also may not misrepresent the charge. If a fee is mandatory or cannot reasonably be avoided, the applicable rule generally requires it to be included in the displayed total price in covered contexts. Those examples are context-specific, not a blanket ruling on every merchant or transaction.
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Visa’s general rules say a merchant may not add to the normal or advertised price unless applicable law expressly permits it. Mastercard’s merchant guidance requires compliance with state and federal law and network rules, disclosure at the point of interaction, and the surcharge shown as a dollar amount on the receipt. Its page lists a 4% maximum network cap, while also limiting the amount by the merchant’s cost of acceptance in relevant cases. A 4% network cap therefore does not mean a merchant may always charge 4%; a law or cost-based limit can be lower.
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Build an evidence file before you call or write
Disputes are easier to resolve when the issuer can see the agreed price, the fee disclosure, and the final charge together. Save copies or screenshots; do not send irreplaceable originals.
- The first statement showing the disputed transaction, including the statement date and the issuer’s billing-inquiries address.
- The itemized receipt, order confirmation, invoice, or terminal screen.
- The advertised, posted, menu, or checkout price before payment.
- Any sign, checkout text, or terms that described a surcharge—or proof that no disclosure appeared.
- The card type and payment channel. Record whether it was credit, debit, or prepaid and whether the payment was online or in person.
- The merchant’s name, transaction date, posting date, base price, surcharge amount, and total.
- Emails, chat messages, call notes, and the merchant’s response. Write down the date, representative’s name if provided, and any promised correction.
- Your card agreement and the issuer’s instructions for billing disputes.
The FTC recommends retaining transaction details and receipts when seeking a correction and enclosing copies rather than originals with a written dispute. Keep a timeline showing when the first statement with the error was sent; the 60-day period runs from that mailing date, not from the day you noticed the fee.
Use this practical workflow
1. Reconcile the receipt and statement
Write the numbers in a simple calculation:
Advertised or agreed price: $___
Fee disclosed before payment: $___
Amount shown on receipt: $___
Amount posted to card: $___
Difference you dispute: $___Check whether the receipt and statement differ, whether the fee was a percentage or flat amount, and whether tax or another legitimate line item explains part of the difference. A fee can be described differently by the merchant and issuer; what matters is what was charged and what was disclosed.
2. Ask the merchant for an explanation when useful
Contact the merchant promptly and ask:
- What is the fee called and how was it calculated?
- Where and when was it disclosed before you paid?
- Was a no-fee payment method reasonably available?
- Why does the receipt or statement differ from the advertised or agreed amount?
Request a written correction or refund if the fee was added without the promised disclosure or was calculated incorrectly. Save the response. This step can produce a quick refund and clarifies the facts, but it is not a prerequisite to an issuer dispute. Regulation Z commentary says a consumer does not have to contact the merchant first before giving the issuer a qualifying billing-error notice. Do not let a promised callback or merchant investigation run past the issuer’s 60-day deadline.
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3. Send a written billing-error notice to the correct issuer address
For a qualifying credit-card billing error, mail or otherwise deliver a written notice to the address the issuer designates for billing disputes, errors, or inquiries. That may be different from the payment address printed on a statement. Use the issuer’s current instructions and retain proof of delivery. Your notice should include:
- Your name and account information sufficient for the issuer to identify the account.
- The merchant name, transaction date, statement date, and disputed amount.
- A factual explanation of what is wrong—for example, an undisclosed fee, an amount different from the receipt, or a surcharge exceeding the amount shown before payment.
- The correction you seek, such as removal of the surcharge and related finance charges.
- Copies of the statement, receipt, posted price, disclosure, and relevant correspondence.
The notice must arrive within 60 days after the first statement containing the error was sent. Keep the letter, every enclosure, mailing receipt, delivery confirmation, and a copy of the complete packet.
Sample notice
I dispute the $___ charge posted by ___ on ___. The advertised/receipt amount was $___, but the statement or receipt charged $___, including a $___ surcharge. The fee was [not disclosed before payment / different from the amount disclosed / calculated incorrectly]. Please investigate this as a billing error under the applicable billing-error procedures and correct the account. Copies of the statement, receipt, and disclosure records are enclosed.
Name: ___
Account identifier: ___
Address: ___
Date: ___Adapt the wording to the actual facts. If the purchase itself was authorized, say so and identify only the disputed amount. Calling the entire transaction fraudulent can obscure the issue and trigger the wrong process.
4. Track the issuer’s deadlines
The FTC says the issuer generally must acknowledge a written billing-error notice within 30 days unless it has already resolved the matter. It must resolve the dispute within two billing cycles and no later than 90 days after receiving the notice. Record the date the issuer received your letter and compare each response with those periods.
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5. Pay the undisputed portion
During the investigation, the FTC says you may withhold the disputed amount and related finance or other charges, but you must pay the undisputed part of the bill, including finance charges attributable to that undisputed portion. Continue making at least the required payment on everything you do not challenge, using the issuer’s instructions. Failure to pay unrelated amounts can create late fees or credit consequences even while the surcharge is under review.
6. Review the decision and appeal if necessary
If the issuer concludes the bill is correct, it must explain the result and state how much is owed. You may appeal in writing within the payment period stated by the issuer or within 10 days after receiving the explanation, whichever is later. Follow the issuer’s response instructions and attach any evidence that addresses its reason for denial.
How the $50 unauthorized-use rule fits
Federal consumer guidance states that liability for an unauthorized credit-card charge is generally limited to $50, subject to the applicable legal framework. That figure concerns unauthorized use of the card—not a general cap on a surcharge you dispute after making an authorized purchase. If you recognize the purchase but not the fee, use the billing-error facts and amount mismatch rather than relying on the unauthorized-use limit.
Credit, debit, and prepaid cards are not interchangeable
The FCBA billing-error guidance discussed here concerns consumer credit cards. Debit-card protections and procedures are different, and prepaid products can have their own terms. Before sending a credit-card billing-error notice, confirm the account type and read the issuer’s instructions. If the card was debit, ask the financial institution for its debit-error procedure and do not assume the 60-day FCBA process, acknowledgment period, or resolution timetable applies unchanged.
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When to escalate beyond the issuer
Issuer did not follow the process
Keep a dated record of your notice, delivery proof, acknowledgment, requests for information, payments, and the final decision. If the issuer fails to handle a qualifying billing-error notice correctly, you can consider submitting a complaint to the Consumer Financial Protection Bureau and provide that timeline and copies of your records.
Possible network-rule violation
Network rules and a federal billing-error claim are separate paths. If the issue is a missing point-of-interaction disclosure, a surcharge not shown as a dollar amount, or an amount that appears to exceed a network limit, consult the relevant network’s current official reporting or inquiry route. Network procedures can change, and the material available for one network does not establish the route for every issue. Verify the current instructions before filing.
Possible state or local violation
A state attorney general, local consumer-protection office, or private attorney may be appropriate when the fee appears to violate a state or local disclosure or pricing rule. Identify the transaction location and date first; a rule in one jurisdiction may not apply to an online seller, a different merchant location, or a later transaction.
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Common mistakes that weaken a surcharge dispute
- Waiting for the merchant. A refund promise does not extend the issuer’s 60-day written-notice period.
- Sending the letter to the payment address. Use the separate billing-inquiries or dispute address specified by the issuer.
- Calling every unexpected fee fraud. Distinguish an unauthorized transaction from an authorized purchase with a disputed amount.
- Assuming every surcharge is illegal. Law, disclosure, payment type, location, amount, and network rules all matter.
- Using a network cap as permission. A 4% network maximum is not a universal entitlement; applicable law or a lower cost-based limit may control.
- Sending originals. Retain your receipts and statements and provide copies.
- Stopping all payments. Pay the undisputed balance and applicable finance charges on that portion.
- Ignoring the card type. Credit-card billing-error protections should not be promised for debit or prepaid transactions.
A decision checklist before you send anything
- Did you authorize the underlying purchase?
- Is the card a consumer credit card rather than debit or prepaid?
- What exact amount was agreed, what fee was disclosed, and what amount posted?
- What was the first statement date showing the error?
- Will your written notice arrive within 60 days of that statement being sent?
- Are you using the issuer’s billing-inquiries address rather than the payment address?
- Have you attached copies of the statement, receipt, price, disclosure, and correspondence?
- Have you paid the undisputed portion of the bill?
- Have you identified the transaction location, channel, and date before making a legal conclusion?
What a successful resolution should document
Keep the issuer’s acknowledgment, investigation result, corrected statement, refund or credit entry, and any adjustment to finance charges. If the merchant refunds the fee directly, verify that the issuer’s account also reflects the credit and that no duplicate or residual charge remains. If the issuer denies the claim, preserve its explanation and your appeal deadline. A complete file protects you if the same amount reappears on a later statement.
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