What a bank reconciliation is and why you need one

A bank reconciliation is the process of comparing your bank statement against your own records to find where the two differ. You do this to catch errors—either yours or the bank's—and to spot fraud or unauthorized transactions before they become bigger problems.

The reason you need one is straightforward: your checkbook or accounting software almost never matches your bank statement on the day it arrives. Checks you wrote take time to clear. Deposits you made might not show up for a day or two. The bank charges fees you forgot about. A reconciliation finds all these gaps and explains them, so you know your actual balance and can trust your records going forward.

Most people reconcile monthly, when the statement arrives. Some do it weekly if they write many checks or run a business. The process takes 15 to 45 minutes depending on how many transactions you have and how organized your records are.

Key Takeaways

  • Gather your bank statement, your checkbook or transaction list, and any deposit receipts or records from the past month.
  • Start with the bank's ending balance and add back any deposits you made that haven't cleared yet, then subtract checks you wrote that haven't cleared.
  • Compare every cleared transaction on the bank statement to your own records and mark each one off as you go.
  • If the two sides don't match after you account for outstanding items, look for duplicate entries, transposed numbers, or fees you missed.
  • Keep your reconciliation worksheet for your records—it documents that you checked your account and found no fraud on a specific date.

Gather the documents you need before you start

Pull together three things: your most recent bank statement (the one you're reconciling), your checkbook register or a list of all transactions you recorded in your accounting software, and any deposit slips or receipts you kept. If you use online banking, you can usually read a PDF of the statement or view it on screen—either works.

You'll also want a pen and paper or a spreadsheet to work on. Some people use the reconciliation worksheet the bank prints on the back of the statement. Others create their own in a spreadsheet or use a template. The format doesn't matter as long as you can track which transactions you've checked off.

If you haven't reconciled in several months, start with the oldest statement first. Reconciling them in order makes it easier to spot when a problem started.

Match cleared transactions line by line

Open your bank statement and your own records side by side. Go through every transaction the bank shows and find it in your records. When you find a match, mark it off in both places—a checkmark, a highlight, or a note that says "cleared" all work.

Pay attention to the amount and the date. A check for $150 that you recorded on the 10th but the bank cleared on the 12th is still the same transaction—the timing difference is normal. But a check for $150 that you recorded as $15, or a deposit that shows up in the bank statement but not in your records, is a problem you need to investigate.

Work systematically: do all the deposits first, then all the checks or withdrawals. This reduces the chance you'll miss something or check the same item twice.

Account for checks and deposits that haven't cleared yet

When you finish matching, you'll have transactions in your records that don't appear on the bank statement yet. These are outstanding items—checks you wrote that the recipient hasn't deposited, or deposits you made that the bank hasn't processed.

List these separately. On your reconciliation worksheet, start with the bank's ending balance, add any deposits that haven't cleared, and subtract any checks that haven't cleared. The result should match your own records' balance.

Example: The bank statement shows an ending balance of $5,000. You wrote a check for $200 that hasn't cleared yet, and you deposited $300 that won't show up until tomorrow. Your calculation is $5,000 − $200 + $300 = $5,100. If your checkbook shows $5,100, you're reconciled.

Find and fix the differences if the numbers don't match

If your adjusted bank balance doesn't equal your records, something is wrong. Start by checking the most common mistakes: a transposed number (you wrote $156 but recorded $165), a duplicate entry (you recorded the same check twice), or a transaction you forgot about entirely.

Look at the difference between the two numbers. If it's $9, $99, or $999, you likely transposed a digit. If it's an exact multiple of a fee or interest amount, the bank charged something you didn't record. If it's the exact amount of a check or deposit, you probably missed one.

Check your bank's website or call the bank's customer service line if you find a transaction on the statement that you don't recognize or didn't authorize. Unauthorized transactions should be reported within 60 days of the statement date to preserve your fraud protection rights.

Document your reconciliation and keep it on file

Once the numbers match, write the date on your reconciliation worksheet and keep it. You don't need to file it with the bank—it's for your records. If a dispute comes up later, you'll have proof of what you checked and when.

If you use accounting software like QuickBooks or Wave, the software usually stores your reconciliation automatically once you mark it complete. If you use a spreadsheet or paper, save or file the worksheet with that month's bank statement.

A completed reconciliation is also useful if you're ever audited or if you need to prove to a creditor or lender that you manage your account carefully.

Frequently Asked Questions

What if I find a check I wrote months ago that still hasn't cleared?

A check that's been outstanding for more than 30 days is unusual and worth investigating. Contact the recipient to confirm they received it. If they say they never got it, you may need to stop payment on the check and issue a new one. If they have it but haven't deposited it, ask them to do so. Once you know the check cleared or was lost, you can remove it from your outstanding items list.

Can I reconcile if I don't have all my receipts?

Yes. Match what you can see on the bank statement to what you recorded. If a transaction appears on the bank statement but you have no record of it, investigate it—it could be fraud, a fee, or something you forgot. If you recorded something but it's not on the statement yet, it's probably still outstanding. The goal is to account for every difference, not to have perfect receipts.

What should I do if the bank made an error?

Contact the bank when ready with the statement, the transaction in question, and any supporting documents (a receipt, a cancelled check, a screenshot). The bank has procedures to investigate and will either correct the error or explain why the transaction is correct. Keep records of your report and the bank's response.

How often should I reconcile?

Monthly is standard and matches the bank's statement cycle. If you run a business or write many checks, weekly reconciliation catches problems faster. If you rarely use the account, quarterly is acceptable. The more often you reconcile, the easier each one is because fewer transactions pile up.

Do I need to reconcile if I use online banking and can see my balance anytime?

Yes. Your online balance shows what the bank has processed, but it doesn't show checks you wrote that haven't cleared yet or deposits that are pending. A reconciliation accounts for those items and confirms that your records match the bank's, which catches fraud and errors that a balance check alone won't find.