What reconciliation means and why you do it monthly

Reconciliation is the process of comparing what your bank says you have against what your own records say you have, then explaining any differences. You do it monthly because your bank statement arrives monthly, because small errors compound, and because catching a fraudulent charge or a processing delay early keeps your cash flow accurate.

The goal is simple: your bank balance and your book balance (the balance in your own accounting records) should match. When they don't, reconciliation tells you why — a check that hasn't cleared yet, a deposit the bank recorded on a different date than you did, a fee you forgot to record, or an actual error by you or the bank.

Most business owners reconcile within a few days of the statement arriving. You'll need your bank statement, your checkbook or accounting software, and about 30 minutes to an hour depending on how many transactions you had that month.

Key Takeaways

  • Start by listing all checks and deposits you recorded that the bank hasn't cleared yet, because these explain most differences between your balance and the bank's.
  • Your bank statement shows only what the bank processed; your records show what you wrote or entered, so timing differences are normal and expected.
  • Mark off each transaction on your bank statement against your records, then investigate any line item that doesn't match.
  • If your balances still don't match after accounting for outstanding items, look for duplicate entries, transposed numbers, or bank fees you didn't record.
  • Keep your reconciliation worksheets for at least one year in case you need to prove a transaction to the bank or your accountant.

Gather your documents and set up your workspace

Pull your bank statement (the one the bank mailed or emailed you), your checkbook, and your accounting records — whether that's a ledger, a spreadsheet, or software like QuickBooks or Wave. If you use accounting software, most of it has a built-in reconciliation tool that walks you through the process; if you use a checkbook and ledger, you'll work on paper or in a spreadsheet.

Write down the ending balance from your bank statement at the top of a piece of paper or a new spreadsheet. Write down the ending balance from your own records separately. These two numbers are what you're trying to make match.

Set aside any bank statements from the previous month so you can see which items you marked as outstanding last time — those should now appear on this month's statement, and you'll want to verify they cleared.

Mark off transactions that match between your records and the bank statement

Go through your bank statement line by line. For each check, deposit, withdrawal, or fee, find the matching entry in your own records. Use a checkmark, a highlighter, or a note in your software to mark it off. This is the most time-consuming part, but it's also where you catch most errors.

Pay attention to the date the bank recorded the transaction, not the date you wrote the check or made the deposit. A check you wrote on the 15th might not clear until the 18th or later. A deposit you made on the 28th might not post until the next business day. These timing differences are normal.

If a transaction appears on the bank statement but not in your records, write it down — it might be a fee, an automatic payment you forgot to record, or a deposit that came in without your knowledge. If a transaction is in your records but not on the bank statement, it's probably still outstanding (not yet cleared).

List outstanding checks and deposits that haven't cleared

Once you've marked off everything that matches, look at what's left in your records. Any check you wrote that didn't appear on the bank statement is an outstanding check. Any deposit you made that didn't appear is an outstanding deposit or deposit in transit.

Write these down in two separate lists with the date, the check number or deposit description, and the amount. Add up all the outstanding checks. Add up all the outstanding deposits. You'll use these numbers in the next step.

Outstanding items are the most common reason your balance and the bank's balance don't match. A check you mailed last week might not reach the payee for several more days, then take another few days to clear the banking system. That's completely normal.

Do the math to see if your balances now match

Use this formula to adjust your bank statement balance:

Bank statement ending balance + Outstanding deposits − Outstanding checks = Adjusted bank balance

Now compare your adjusted bank balance to your book balance (the ending balance from your own records). If they match, you're done — your reconciliation is complete.

If they don't match, the difference is called the reconciling item or variance. Write down the exact dollar amount of the difference. This number will help you figure out what went wrong.

Find and fix the difference if balances don't match

If the difference is small — a few dollars — start by looking for bank fees you didn't record, interest the bank paid you, or automatic payments that posted without your knowledge. Check your bank statement for any line item labeled "fee," "service charge," "interest," or "automatic payment." If you find one, add it to your records and recalculate.

If the difference is larger, look for a transposed number (you wrote 1,250 but the bank shows 1,520), a duplicate entry (you recorded the same deposit twice), or a check amount that doesn't match between your checkbook and the bank statement. Go through your outstanding items list again and verify each amount.

If you still can't find it, pull last month's reconciliation and make sure all the items you marked as outstanding then actually cleared this month. Sometimes a check takes longer than expected, or a deposit reverses.

If the difference is exactly divisible by 2, 9, or 10, it's often a math error or a transposition. If it's an odd amount that doesn't match any single transaction, call your bank — there may be a processing error on their end.

Record any items you missed and save your work

Once you've found the difference, record any missing transactions or corrections in your accounting records. If the bank charged a fee you didn't know about, enter it as an expense. If you forgot to record a check, add it now. Recalculate your book balance.

Your book balance should now match your adjusted bank balance. If it does, write the date and "Reconciled" on your bank statement and file it with your other financial records.

Keep your reconciliation worksheets, your bank statements, and your supporting documents (canceled checks, deposit slips, receipts) for at least one year. If your accountant or the bank ever questions a transaction, you'll have proof of when it cleared and what it was for.

Frequently Asked Questions

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

A check that old is considered stale. Call the payee to confirm they received it and ask if they plan to cash it. If they don't, you may need to issue a new check and record the original as void. Some banks will stop honoring checks older than six months, so don't ignore this.

Can I reconcile using my accounting software instead of doing it by hand?

Yes. Most software like QuickBooks, Wave, or FreshBooks has a reconciliation feature that walks you through the same steps — matching transactions, listing outstanding items, and calculating the difference. The software does the math for you, which reduces errors. You still need your bank statement and your records to start.

What should I do if the bank made an error and my balance is wrong because of it?

Document the error with a screenshot or printout of the transaction, then call your bank's business customer service line. Explain what the error is, when it occurred, and what the correct amount should be. The bank will investigate and either correct it or explain why the charge is correct. Keep a record of the call and the resolution.

Do I need to reconcile if I use accounting software that connects to my bank?

Yes, even with connected software. The software may auto-match transactions, but you still need to review them and mark them as reconciled. This catches duplicate entries, misclassified transactions, and unauthorized charges that the software might miss.

What if I find a fraudulent charge on my bank statement?

Report it to your bank immediately — don't wait until next month's reconciliation. Most banks have a fraud department and a phone number on the back of your debit card. The sooner you report it, the faster the bank can investigate and reverse the charge if it's fraudulent.