What makes a check fraudulent and why it matters to you

A fraudulent check is one that was created, altered, or presented with the intent to deceive — either to steal money that isn't there or to take funds from an account without permission. The person writing it may have forged a signature, used a closed account, written a check for more than they have, or created a fake check entirely. When you deposit or cash a fraudulent check, the bank will eventually discover it, reverse the deposit, and you become responsible for the money — even if you had no idea the check was fake.

Unlike a legitimate cashier's check backed by the bank's own funds, a fraudulent check creates a chain of liability that can land on you. If you deposit it into your account and spend the money before the fraud is caught, your bank will deduct the full amount from your balance, potentially leaving you overdrawn. If you cashed it and spent it, you may face civil claims or criminal charges depending on whether you knew it was fraudulent.

Key Takeaways

  • Fraudulent checks are discovered days or weeks after deposit, so money that appears in your account may disappear without warning.
  • You are liable for the full amount of a fraudulent check you deposit, even if you did not know it was fake.
  • Common red flags include mismatched routing numbers, unusual payment requests, checks from strangers, and pressure to cash or deposit quickly.
  • If you suspect a check is fraudulent, contact your bank when ready and do not deposit it; if you already deposited it, report it to your bank and the police.
  • Cashier's checks are harder to forge than personal checks but can still be counterfeited, so verify directly with the issuing bank before accepting one.

Red flags that signal a check may be fraudulent

The most common warning sign is pressure to act fast. Scammers often ask you to deposit a check and wire money back, send a gift card, or pay a fee before the check clears. Legitimate transactions rarely come with urgency. If someone you do not know sends you a check for more than the agreed amount and asks you to return the difference, that is almost always fraud.

Look at the check itself. The routing number (the nine digits on the left) should match the bank name printed on the check — you can verify this on the Federal Reserve's routing number database. The MICR line (the numbers printed in magnetic ink at the bottom) should be crisp and clear, not blurry or raised. Signatures that look shaky, inconsistent, or photocopied are warning signs. Checks from major banks should have security features like watermarks or color-shifting ink; a plain white check from a large bank is suspicious.

Be cautious of checks from people you have never met, especially if they arrive unsolicited. Overpayment schemes — where a buyer sends a check for more than the purchase price and asks you to wire the overage — are nearly always fraudulent. Checks for lottery winnings, inheritance, or job offers from companies you did not explore to are common fraud tactics.

What happens when a fraudulent check is deposited

When you deposit a check, your bank may make funds available within one to three business days. This does not mean the check has cleared. The bank is extending you credit while it processes the check with the issuing bank. If the check is fraudulent, the issuing bank will reject it — usually within five to ten business days, though it can take longer.

Once the check is rejected, your bank reverses the deposit and deducts the full amount from your account. If you have already spent the money, your account goes negative and you owe the bank. The bank may charge overdraft fees on top of the loss. You are responsible for repaying the amount, and the bank may pursue collection or close your account.

If you cashed the check instead of depositing it, you have the cash but the bank will still hold you liable. The person or business that gave you the check may also pursue a civil claim against you for the amount, since they are out the money too.

How to verify a check before you accept it

For a cashier's check, call the bank directly using the phone number on the back of the check or look up the number yourself — do not use a number the person who gave you the check provides. Ask the bank to confirm that the check number, amount, and payee name match their records. The bank can tell you whether the check was issued and whether it is still valid. This step takes five minutes and eliminates most counterfeits.

For a personal check, you can ask the person for their bank account information and verify it independently, though banks will not confirm whether someone has sufficient funds. If the check is for a large amount or from someone you do not know well, ask for an alternative payment method — a bank transfer, credit card, or money order — that offers more protection.

Never deposit a check and then send money back to the person who gave it to you. This is the structure of nearly every overpayment scam. If you must return money, wait until the check has fully cleared — usually seven to ten business days — and use a separate transaction.

Steps to take if you suspect a check is fraudulent

Do not deposit it. If someone has given you a check and you have doubts, contact your bank or the issuing bank to verify it before you deposit it. If you have already deposited it and now suspect it is fraudulent, contact your bank when ready. Tell them which check you are concerned about, provide the check number and amount, and explain why you think it may be fake. Your bank will flag it and monitor it.

If the check was part of a scam — for example, you were asked to wire money back or you lost money as a result — report it to the Federal Trade Commission at ReportFraud.ftc.gov. Also file a report with your local police department. If the check was used to commit identity theft or the fraud involved a job offer or romance scam, include those details in your police report.

Keep the check itself and all communications related to it. Do not throw it away or destroy it. If your bank needs to investigate or if law enforcement gets involved, you will need to produce the original check and any emails, text messages, or letters that came with it.

Your liability and what your bank will and will not cover

You are liable for the full amount of a fraudulent check you deposit, period. Your bank is not responsible for your loss, even if you deposited it in good faith. This is the rule under the Uniform Commercial Code, which governs check handling across all U.S. banks. The only exception is if your bank failed to follow standard procedures — for example, if they did not verify the routing number or ignored obvious signs of forgery — but this is rare and difficult to prove.

If you were the victim of a scam and lost money as a result of depositing a fraudulent check, you may be able to recover it from the scammer through civil court, but that requires identifying them, suing them, and collecting a judgment — a process that is often impossible. Your bank will not refund you. Your homeowner's or renter's insurance will not cover it. This is why verification before deposit is your only real protection.

Frequently Asked Questions

Can a cashier's check be fraudulent?

Yes. While cashier's checks are harder to forge than personal checks because they are backed by the bank's own funds, counterfeits do exist. Always call the issuing bank directly to verify a cashier's check before you accept it, especially for large amounts. Use the phone number on the check or look it up yourself — never use a number provided by the person giving you the check.

What if I deposited a fraudulent check and already spent the money?

Contact your bank when ready and explain the situation. Your account will go negative when the check is rejected, and you will owe the bank the full amount plus any overdraft fees. Report the fraud to the police and the Federal Trade Commission. You may be able to recover money from the scammer through civil court, but this is difficult and often unsuccessful.

How long does it take for a fraudulent check to be discovered?

It varies. Some fraudulent checks are caught within five to ten business days, but others take two to three weeks or longer. Do not assume a check has cleared just because the money appears in your account. Wait at least ten business days before spending money from a check you are unsure about.

Can I go to jail for depositing a fraudulent check I didn't know was fake?

Criminal charges are unlikely if you genuinely did not know the check was fraudulent and you did not benefit from the fraud. However, if you knowingly deposited a fake check or participated in a scam, you could face criminal charges for fraud or forgery. If you suspect a check is fraudulent, do not deposit it.

What should I do if someone asks me to cash a check and wire money back?

Do not do it. This is a classic overpayment scam. The check will be fraudulent, and by the time it is discovered, you will have already wired your own money to the scammer. Your bank cannot recover wire transfers. If this happens, report it to your bank, the police, and the Federal Trade Commission when ready.