How to Detect Check Fraud Early

By Amy Miller, AFC® Made in partnership with the American Association of Credit Union Leagues, America's Credit Unions, and TruStage

Whether a check was stolen from the mail, altered, forged, or used in a scam, the sooner you notice suspicious activity, the better your chances are of limiting financial loss and protecting your account. The challenge? Check fraud is not always obvious right away. 

A payment may seem delayed. A check might clear for the wrong amount. Or you may notice a transaction you don’t recognize weeks later. That’s why regular account monitoring matters. Here’s how to spot the warning signs of check fraud and what to do if something doesn’t look right. 

Warning Signs of Check Fraud 

Fraud often leaves some clues. Knowing what to look for can help you act quickly. 

A Check Hasn’t Been Cashed When You Expected It To 

If you mailed a payment and it has not been processed within the normal timeframe, it is worth checking on. This does not always mean fraud, but it could mean the check was delayed, lost, or intercepted.  

What to do: Start by contacting the person or company you paid, and confirm whether they’ve received it or not.  

A Check Clears for the Wrong Amount 

One of the clearest warning signs is a check clearing for more (or less) than you wrote it for. This may happen in cases of check washing or altered checks. 

What to do: Compare your check register or payment records to your account statement, and review the check image. Most financial institutions provide them through online banking, or you can request them at your local branch or customer service line.   

You See a Payment to Someone You Don’t Recognize 

If your account shows a check made out to a person or business you did not authorize, that could be a sign of fraud. This may happen with forged or altered checks. 

What to do: Review the transaction details immediately, and contact your financial institution right away  

Missing Checks or Missing Mail 

If checks from your checkbook are missing or you notice missing mail, it may signal theft. Stolen blank checks can be used fraudulently. 

What to do: Secure your remaining checks; report missing checks to your financial institution and any missing mail to the post office.  

Unfamiliar Withdrawals or Account Activity 

Not all fraud appears as a check image. Sometimes fraud starts with stolen account information and shows up as other account activity. 

What to do: Watch for small test transactions, unusual withdrawals or multiple failed payment attempts.  

Simple Ways to Monitor Your Accounts 

The best way to catch fraud early is to make account monitoring a regular habit. It does not have to take long. 

Set Up Account Alerts 

Most financial institutions allow you to set up alerts for withdrawals, deposits, checks clearing, low balances and large transactions. These alerts can help you spot suspicious activity quickly.  

If you are not comfortable using mobile banking, ask your financial institution if they offer phone, text or email alerts. 

Review Your Account Weekly 

A quick weekly review can help you catch issues before they grow. Check for payments you don’t recognize, checks clearing for the wrong amount, or missing expected transactions. Even five minutes can help. 

Check Your Cleared Check Images 

Many financial institutions allow you to view images of checks that have cleared. Look for the correct payee, correct amount, and your actual signature. This can help spot altered or forged checks. 

Keep a Simple Record of Checks You Send 

Whether it’s a checkbook register, a notebook, or a note on your phone, tracking helps. Record the date you sent the payment, the amount and the recipients information. That makes it easier to compare later. 

Be Careful with Unexpected Checks 

If you receive a check you were not expecting, especially tied to a job, prize, or payment request….pause! Ask questions before depositing it. Unexpected money is often a warning sign. 

What to Do If You Notice Something Suspicious 

If you think something may be wrong, act quickly. 

Step 1: Contact Your Financial Institution  

Review what you’ve noticed with them. They can assist with freezing or flagging the account and transaction, place a stop payment or investigate the issue further. The sooner you contact them, the better. 

Step 2: Gather Your Records 

Collect check numbers, account statements, payment records, and any related emails, text, or related messages. Having information ready can speed up the process. 

Step 3: Monitor Closely 

After reporting suspicious activity, keep watching your account. Fraud sometimes happens in more than one transaction. 

Step 4: Change Account Security If Needed 

Depending on the situation, it may be recommend that you close your account and open a new one, update passwords or add extra account protections.  

Early Action Can Make a Big Difference 

Check fraud can be stressful but early detection gives you more options. 

The key is simple: 

• Review your account regularly  

• Pay attention to missing or unusual transactions  

• Act quickly if something feels off  

Small habits can help protect your money. Download our check fraud detection checklist to help monitor your account, track payments, and catch suspicious activity sooner. 

If you’re ready to learn more about how small steps can help build your financial confidence, take the take the America Saves Pledge today. It’s a simple commitment to save for what matters most to you, one step at a time.