Check washing: how to spot and report an altered check

Check washing is fraud in which someone changes information on a stolen paper check to redirect the payment or increase the amount. If a mailed check looks altered or the recipient says it never arrived, contact your bank promptly, request the check images, and report suspected mail theft.

• A payment leaving your account does not prove the intended recipient received it.
• Review the recipient, amount, and endorsement on available check images.
• Careful mailing and writing habits reduce exposure but cannot eliminate fraud.
• Bank reporting and a mail-theft report serve different purposes; keep records of both.

How does check washing affect a mailed payment?

A paper check contains instructions about who receives money and how much they receive. In a washing scheme, a thief removes writing and substitutes different payment details, potentially leaving the account holder’s signature in place.

Guidance from the American Bankers Association and the U.S. Postal Inspection Service, reproduced by Postal Times, identifies mailed checks as a target. Someone waiting for a routine bill payment to arrive may not realize the money has gone elsewhere.

FinCEN’s analysis of mail-theft-related check fraud also identifies counterfeiting and fraudulent endorsements. That means an unchanged payment amount is not enough to establish that everything went correctly: the recipient and the endorsement matter too.

What is different from a fake-check deposit scam?

This article concerns a check you wrote that was stolen or altered. A different problem arises when someone sends you a fraudulent check and asks you to forward money; the practical starting point here is your outgoing payment and whether it reached its intended destination.

What warning signs can you check in your account?

Start with the payment record rather than trying to judge whether the paper looks suspicious. Compare your original payment details with the transaction and any check images available through online or mobile banking.

• Does the recipient’s name match the person or organization you intended to pay?
• Does the amount match your own record?
• Does the endorsement on the back appear consistent with the intended recipient?
• Has that recipient confirmed receiving the payment?

The ABA and Postal Inspection Service guidance specifically calls for reviewing the back of paid checks when images are available. Thieves may deposit stolen checks without visibly changing the front, making the endorsement another important detail.

A recipient reporting a missing payment is a reason to investigate, not proof of a crime. Delivery delays and processing issues can also create uncertainty; record what you know and describe the discrepancy to the bank without guessing how it happened.

For related precautions around the information printed on financial documents, see our guide to protecting personal data in everyday life.

What can you do if a check was stolen or changed?

Contact the bank through a trusted channel, such as its official app or the number on your statement. Explain whether the check is missing, has already been paid, or appears to have a different recipient or amount.

1. Request copies of the suspected fraudulent check, including the back where available.
2. Provide your original payment details and describe what the intended recipient told you.
3. Ask what claim documents, reporting deadlines, and account-protection steps apply.
4. Report suspected mail theft to the U.S. Postal Inspection Service and report the fraud to local police.
5. Keep the bank’s case reference, report confirmations, and subsequent correspondence together.

The bank-reporting and law-enforcement steps come from the ABA and Postal Inspection Service guidance. According to the Office of the Comptroller of the Currency’s HelpWithMyBank answer, reviewed in April 2024, the Postal Inspection Service also provides check-washing prevention and reporting information.

What about another payment to the recipient?

Ask the bank and recipient how to handle a replacement before sending it. Explain that the original payment is disputed and ask how any later recovery or duplicate payment would be handled; a second check does not resolve the first transaction by itself.

Avoid treating reimbursement as certain or assuming every bank uses the same process. Ask for the institution’s explanation in writing, including what it needs from you and when to follow up.

How can you reduce the risk when sending checks?

Think about both the writing and the mailing. The ABA and Postal Inspection Service guidance recommends indelible black ink and completing the recipient and amount lines without leaving room for additions.

It also cautions against adding unnecessary sensitive details, such as a Social Security number or credit card information. A check already contains financial information, so limiting extra identifiers avoids exposing more personal data if it disappears.

For mailing, the same guidance favors letter slots inside post offices. Collect incoming mail promptly, arrange for mail to be held when traveling, and follow up with senders when expected mail does not arrive.

After sending a check, confirming receipt closes a gap that account monitoring alone cannot address. Looking only for a debit tells you money moved; it does not tell you that the right person received it.

Would an electronic payment remove the problem?

The guidance lists electronic payments as an alternative to mailing paper checks. That can avoid placing a physical check in the mail, but it is not a promise that the electronic transaction is free of other risks.

Verify the recipient and payment instructions through a trusted route. Our guide to safer online payments covers related precautions, while our explanation of recognizing suspicious messages can help when an unexpected request arrives.

Informational content only, not financial advice.