A bank reconciliation should be prepared monthly, after your statement arrives, to catch errors and fraud before they compound

A bank reconciliation is the process of comparing your bank statement against your own records to make sure the two match. You list every transaction you recorded, subtract what the bank shows, and find the difference. Most of the time the difference is timing—checks you wrote that haven't cleared yet, deposits the bank hasn't processed. Sometimes it's an error by the bank, a duplicate charge, or fraud. Monthly reconciliation catches these problems while they're still small and while the bank's window to dispute them is still open.

The reason to do this monthly, not quarterly or yearly, is that banks typically give you 30 to 60 days to report unauthorized transactions or errors before they're considered final. If you reconcile only once a year, you may discover a fraudulent charge from month three and have no recourse. Monthly reconciliation also keeps your records accurate for taxes, loans, and any time you need to prove what you actually spent or received.

Key Takeaways

  • Reconcile your account within a few days of receiving your monthly statement, before the bank's dispute window closes.
  • Start by listing all transactions you recorded in your own records, then compare them line by line to what the bank shows.
  • Timing differences—pending checks and deposits—are normal and expected; note them separately from actual errors.
  • If you find a discrepancy you cannot explain, contact your bank within 30 days with the transaction details and any supporting documents.
  • Reconciliation protects you from fraud, catches bank errors, and keeps your records accurate for taxes and financial decisions.

How to set up a basic reconciliation

Start with your bank statement. Write down the opening balance shown at the top—this is what the bank said you had at the start of the period. Then list every deposit and withdrawal the bank recorded during that month, in order. Do the same with your own records: your checkbook, your online banking history, or whatever system you use to track money in and out.

Create two columns side by side. One for the bank's transactions, one for yours. Go through each item on the bank statement and mark it off in your records if you see it there. If you wrote a check on the 5th but the bank didn't clear it until the 18th, mark it as cleared on the 18th—that's when the bank's version of events happened. Do this for every single transaction until you reach the end of the statement period.

At the end, add up all the bank's deposits and subtract all the bank's withdrawals. Write down that final number. Do the same with your records. If they match, you're done. If they don't, move to the next section.

Finding the difference when numbers don't match

The most common reason for a mismatch is outstanding items—transactions you recorded but the bank hasn't processed yet. A check you mailed on the 25th might not clear until the 2nd of next month. A deposit you made on the 28th might not show up until the 30th. These are not errors; they're just timing.

To account for them, create a separate list of items that appear in your records but not on the bank statement. Add up all the outstanding deposits and subtract all the outstanding checks. Then take the bank's ending balance, add the outstanding deposits, and subtract the outstanding checks. That number should now match your records. If it does, reconciliation is complete.

If the numbers still don't match after you've accounted for timing, the difference is an actual error or discrepancy. Write down the exact amount of the difference. Then go back through both lists line by line, looking for a transaction that appears twice, a transaction with the wrong amount, or a transaction that appears in one record but not the other. Common culprits are duplicate deposits, transposed numbers (writing $150 instead of $510), fees you forgot to record, or interest the bank added.

What to do if you find an error

If the error is in your own records—you forgot to write down a fee, or you recorded a check for the wrong amount—correct your records to match the bank. Your bank statement is the official record of what actually moved; your job is to update your side to match.

If the error appears to be the bank's—a charge you didn't authorize, a deposit that shows the wrong amount, a transaction that appears twice—contact your bank immediately. Have your statement and any supporting documents ready: the original deposit slip, a copy of the check, a screenshot of the online transfer, or a receipt from the store. Tell the bank the specific transaction, the date, the amount, and why you believe it's wrong. The bank will open a dispute and investigate, usually within 10 business days. During that time, the bank may temporarily credit your account while they look into it.

Banks are required by federal law to investigate errors reported within 60 days of the statement date. After 60 days, they can refuse to investigate. So report any discrepancy you find within that window, even if you're not certain it's wrong—let the bank make the information.

Fraud and unauthorized transactions

If you see a charge you didn't make or a withdrawal you didn't authorize, treat it as fraud immediately. Do not wait until next month's reconciliation. Call your bank's fraud line—the number is usually on the back of your card or on your statement—and report it the same day you notice it. The bank will freeze the transaction and begin an investigation.

Your liability for fraudulent charges depends on how quickly you report them. If you report an unauthorized charge within two business days of discovering it, your liability is capped at $50. If you wait more than two business days but less than 60 days, your liability can be up to $500. After 60 days, you may lose all protection and be liable for the full amount. This is why monthly reconciliation matters: you catch fraud early, when your protection is strongest.

Keep any evidence of the fraud: screenshots, emails, receipts showing you were somewhere else when the charge occurred, or a police report if the fraud was part of identity theft. Send these to your bank along with your dispute.

Reconciliation for online and mobile banking

If you use online banking, you can often download your transactions directly into a spreadsheet or accounting software. Many banks offer a feature that lets you categorize transactions and flag them as cleared. This makes reconciliation faster because the software can match your records to the bank's automatically.

Even if you use software, the principle is the same: compare what you recorded to what the bank shows, account for timing differences, and investigate any discrepancies. Software reduces the chance of arithmetic errors, but it doesn't replace the need to actually look at each transaction and ask yourself whether it's correct.

Some banks also offer a "reconciliation" or "account verification" tool built into their app. This is not the same as the reconciliation described here. Those tools typically just confirm that your login is working or that your account is active. They don't compare your records to the bank's records.

When to reconcile and how often

Reconcile as soon as your statement arrives—usually within a few days of the end of the month. The sooner you do it, the fresher the transactions are in your memory, and the sooner you can report any errors while the bank's dispute window is still wide open.

For most people, monthly reconciliation is enough. If you run a business, have multiple accounts, or handle a lot of cash, you may want to reconcile weekly or even daily. If you rarely use your account or have very few transactions, you could reconcile every other month, but monthly is the standard and the safest.

Set a reminder on your phone or calendar for the same day each month—the day your statement typically arrives, or a few days after. Make it a routine, like paying bills. It takes 15 to 30 minutes for most people, and it's the single best way to catch problems before they become expensive.

Frequently Asked Questions

What if my bank statement and my records differ by a few cents?

A few cents is usually a rounding error in interest calculation or a fee the bank charged that you didn't know about. Check your statement for any fees or interest credits you didn't record. If you find it, add it to your records and reconciliation is complete. If you can't find the source and it's truly just a few cents, most people let it go rather than spend an hour tracking it down.

Do I need to reconcile if I use budgeting apps that sync with my bank?

Synced apps are helpful, but they're not a substitute for reconciliation. Apps can miss transactions, categorize them incorrectly, or fail to sync if there's a connection problem. Reconciliation is your chance to verify that what the app shows matches what the bank actually processed. Do both.

What if I find an error from three months ago?

If it's a bank error, you have 60 days from the statement date to report it. After that, the bank is not required to investigate. If it's your own error, correct your records whenever you find it. If it's fraud, report it immediately even if it's old—the bank may still be able to help, and you want it documented.

Can I reconcile quarterly instead of monthly?

You can, but you shouldn't. Quarterly reconciliation means you're waiting up to three months to catch fraud or errors, and by then the bank's dispute window may have closed. Monthly reconciliation takes 20 minutes and protects you far better.

What if my bank won't investigate a disputed charge?

If your bank refuses to investigate a charge you reported within 60 days, you can file a complaint with the Consumer Financial Protection Bureau (CFPB) or your state's banking regulator. You can also dispute the charge with your credit card company if the transaction was a credit card charge. Document everything—your dispute report, the bank's response, and any communication you had with them—before you escalate.