You are selling a couch online for $400. A buyer sends you a check — but it is for $2,400. “Oops, my assistant made a mistake,” the buyer explains. “Just deposit it, keep your $400, and wire the extra $2,000 back to my shipper.” You deposit the check, the money appears in your account the next day, and you send the difference. A week later your bank calls: the check was counterfeit. The $2,400 disappears from your account — and so does the $2,000 of your own real money that you wired to a stranger.
This is the overpayment scam, one of the oldest and most effective frauds in circulation, and it works because it exploits a gap between what your bank balance shows and what is actually true. By law, banks must make deposited funds available quickly — often within a day or two. But a fake check can take weeks to be discovered. In that window, your account shows money that does not really exist, and the scammer is counting on you to act before the truth arrives.
The losses are enormous. The FTC reported that consumers lost more than $28 million to fake check scams in 2019 alone, with a median reported loss of $1,988 — more than six times the median loss across all frauds the agency tracks. Reports were up about 65% over 2015 levels, and the FTC found that people in their twenties were more than twice as likely as older adults to report losing money this way. In 2024, the FBI’s IC3 logged $21.45 million in “overpayment” losses. This article explains exactly how the trap is set, the many forms it takes, and the simple rules that make you immune to it.
How an Overpayment Scam Works: Step by Step
Step 1: The hook. The scammer responds to your online listing, job application, or ad — or contacts you out of nowhere with a prize, a job offer, or a business proposal. Everything seems normal at first.
Step 2: The inflated check arrives. You receive a check — personal, cashier’s, corporate, or money order — written for more than the agreed amount. The overpayment always comes with a convincing story: a shipping agent needs paying, taxes must be covered, equipment must be purchased, the “assistant” made an error.
Step 3: The deposit — and the illusion. You deposit the check. Federal law requires your bank to make the funds available quickly, so within a day or two your balance shows the money. This is the critical moment: available funds are not the same as a verified check. The bank has not confirmed the check is good; it has only followed the law on availability.
Step 4: The refund demand. Pressured by urgency (“the shipper is waiting,” “send it today”), you wire the excess — your own real money, drawn against the illusory balance — to the scammer, often via wire transfer, gift cards, or money order. These payment methods are effectively irreversible.
Step 5: The bounce. Days or weeks later, the check is identified as counterfeit — sometimes a sophisticated fake printed with a real company’s name, sometimes a genuine check from an identity-theft victim’s account. Your bank reverses the entire deposit. You now owe the bank the full amount of the fake check, plus the real money you sent to the criminal is gone.
The American Bankers Association puts it plainly: just because the check has “cleared” does not mean it is good. “Cleared” in everyday language usually just means the funds were made available — not that the check was verified as legitimate.
Why the Money Shows Up: The Availability Trap
This scam would not work without a well-meaning consumer protection law. Under federal funds-availability rules, banks must make deposited check funds available on a fast schedule — typically the next business day for many deposits. The law exists so ordinary people are not left waiting weeks to use their own money.
But verifying a check is a completely separate, much slower process. A counterfeit cashier’s check drawn on a distant bank can take weeks to travel back through the clearing system and be identified as fake. Sophisticated fakes — printed with real bank names, real routing numbers, even watermarks — can fool bank tellers on sight. Some are not even “fake” in the printing sense: they may be real checks stolen from someone whose identity was compromised.
The scammer’s entire strategy is to live inside that gap: the days or weeks between “funds available” and “check verified.” Everything about the scam — the urgency, the plausible story, the specific refund method — is engineered to make you move your real money during that window.
The Most Common Fake Check Disguises
Online selling overpayment. The classic: a buyer “accidentally” overpays for your item and asks you to refund the difference. Never accept a check for more than your selling price — the FTC calls this one of the clearest possible signs of fraud.
Mystery shopper scams. You are “hired” to evaluate a store, often one selling gift cards or money orders. Your first assignment: deposit the enclosed check, buy gift cards, and send the PINs to your “employer.” Real mystery shopping companies never operate this way.
Nanny, caregiver, and personal assistant scams. A fake employer sends you a check to “buy supplies” or “pay vendors,” instructing you to keep a portion and forward the rest. A legitimate employer will never ask you to do this.
Car wrap advertising. You are offered money to drive with an advertiser’s decal on your car. The “company” sends a check covering your pay plus payment for the “decal installer” — whom you must pay by wiring funds. The installer does not exist.
Lottery and prize scams. You receive a check representing “winnings” and are told to send money for taxes or fees to release the full prize. Legitimate lotteries never require payment to collect.
Rental and pet scams. A prospective tenant or pet buyer overpays by check and asks you to forward the excess to a “mover” or “shipper.”
Red Flags: The Fake Check Checklist
- A check for more than the agreed amount. There is no legitimate reason for a stranger to overpay you by check and ask for the difference back. The FTC says you can bet it is a scam.
- Pressure to send money back quickly. Wire it today, buy gift cards now, don’t wait — urgency exists to beat the check’s inevitable bounce.
- Refund demanded by wire, gift card, money order, or crypto. These are irreversible. A legitimate business would accept a normal refund method.
- A story explaining the overpayment. Stuck abroad, an assistant’s error, taxes and fees, shipping agents — the story is always plausible and always fictional.
- The check arrived unexpectedly. Prizes you never entered, jobs you never interviewed for, buyers you never met.
- Instructions to keep it secret. “Don’t tell your bank why you’re depositing this” is a confession in disguise.
- The sender is unreachable or vague about their identity, address, or business details.
How to Verify: 7 Steps Before You Touch the Money
- Independently confirm who you are dealing with. Verify the buyer’s or employer’s name, street address, and phone number through sources you find yourself — not ones they provided.
- Refuse any check written for more than the correct amount. Ask the buyer to send a check for the exact price. If they refuse, walk away and do not send any merchandise.
- Never wire money back or buy gift cards with check funds. The FTC’s guidance is absolute: never use money from a check to send gift cards, money orders, cryptocurrency, or wire transfers to someone who asks you to.
- Call the issuing bank directly — using a number you look up yourself — to verify the check before depositing, especially for large amounts. Ask whether the account and check are legitimate.
- Talk to your own banker. Explain where the check came from and that you are being asked to send money back. Bankers see these scams regularly and can spot them.
- Resist “act now” pressure. A legitimate buyer or employer will still be there after the check genuinely clears — which can take weeks, not days.
- Consider safer payment methods for online sales: cash in person, or an escrow or established online payment service — never a stranger’s check plus a refund.
What to Do If You Already Deposited a Fake Check
- Contact your bank immediately. Explain the situation honestly. You are liable for the deposit, but early communication helps — and the bank needs to know fraud is involved.
- Try to reverse the outgoing payment. If you wired money, call the wire company at once (Western Union: 1-800-325-6000; MoneyGram: 1-800-666-3947) and ask for a reversal. If you bought gift cards, contact the card issuer immediately. If you sent a money order, contact the issuer about stopping payment — and if it went by U.S. mail, contact the U.S. Postal Inspection Service at 877-876-2455.
- Do not spend any remaining “extra” funds. The deposit will be reversed; spending it only deepens what you owe.
- Save everything: the check or images of it, all messages, receipts, and transfer records.
- File a police report — it creates an official record.
How to Report Fake Check and Overpayment Scams
- FTC: Report at ReportFraud.ftc.gov. The FTC receives tens of thousands of fake check reports each year and uses them to track trends.
- FBI Internet Crime Complaint Center: File at ic3.gov.
- U.S. Postal Inspection Service: If the check or related mail came through the U.S. mail, report it — mail fraud is a federal crime.
- Your state attorney general: State consumer protection offices pursue local patterns.
- The bank whose name appears on the check: Its fraud department will want to know its instruments are being counterfeited.
The Bottom Line on Overpayment Scams
An overpayment scam turns your own honesty against you: you believe the check is real because your bank balance says so, and you send back “their” money as any decent person would. But the balance was an illusion created by funds-availability law, and the money you returned was real. Remember the two rules that defeat every version of this fraud: never accept a check for more than the correct amount, and never send money back to someone who sent you a check. Funds you can see are not funds you can trust — not until the check itself has been verified, which takes far longer than a day or two.
Sources
- Federal Trade Commission, “How To Spot, Avoid, and Report Fake Check Scams” — https://consumer.ftc.gov/articles/how-spot-avoid-and-report-fake-check-scams
- Federal Trade Commission, “FTC Warns Consumers about Check Overpayment Scams” (2004) — https://www.ftc.gov/news-events/news/press-releases/2004/12/ftc-warns-consumers-about-check-overpayment-scams
- American Bankers Association, “Fake Check Scams” — https://www.aba.com/advocacy/community-programs/consumer-resources/protect-your-money/fake-check-scams
- American Bankers Association, “Fake Check Scams Infographic” — https://www.aba.com/news-research/analysis-guides/fake-check-scams-infographic?PF=1
- Military Consumer (FTC), “FTC: The bottom-line on fake checks scams” — https://www.militaryconsumer.gov/blog/ftc-bottom-line-fake-checks-scams
Last reviewed: October 2026
This article is for education only and is not financial or legal advice.