To reconcile your check register and bank statement, compare each transaction on the statement to the matching entry in your register, mark off every pair that agrees, then adjust the bank’s ending balance for items you have recorded but it hasn’t processed, and adjust your register’s ending balance for items the bank processed but you haven’t recorded. When both adjusted figures land on the same number, that number is your real cash balance.
The two balances almost never agree on the first look. Checks you’ve written sit in someone’s drawer for a week. A deposit you made Friday afternoon doesn’t post until Monday. The bank quietly deducts a service fee you never logged. Reconciling is the routine that resolves all of that into one trustworthy figure.
What to Pull Together Before You Start
You need three things in front of you: the most recent bank statement with its ending balance and transaction list, your check register (paper, spreadsheet, or the cash account inside your accounting software), and the reconciliation you completed last period. That old worksheet matters because it lists the checks and deposits that hadn’t cleared yet last time, and part of this round’s work is verifying those items finally went through.
Write down two starting numbers. The ending balance printed on the bank statement is your starting bank balance. The ending balance in your register as of the same cutoff date is your starting book balance. These are the two figures you’ll adjust until they match.
Match Every Transaction Line by Line
Go through the bank statement one entry at a time. For each deposit and each withdrawal, find the matching entry in your register and mark both sides. Use a check mark, a highlighter, or a column in your spreadsheet — whatever system keeps you from losing track and re-counting an item.
When you’re done, two piles of unmatched items remain, and each one tells you something specific:
- Entries in your register with no match on the statement are transactions the bank hasn’t processed yet. These adjust the bank side.
- Entries on the statement with no match in your register are transactions you haven’t recorded yet. These adjust the book side.
Those two piles drive every adjustment that follows.
Adjust the Bank Balance
Start with the statement’s ending balance. Add every deposit in transit, meaning any deposit you’ve recorded in your register that hadn’t cleared by the statement cutoff. Then subtract every outstanding check: checks you wrote and logged, but the payee hasn’t yet cashed or deposited.
What you have now is the adjusted bank balance. It represents what the bank would show if it finished processing every pending item right this moment.
Adjust Your Register
Start with the ending balance in your register. Then work through everything the bank recorded that you didn’t.
Add anything that increased your account without your knowledge. Interest credits. Electronic deposits you weren’t expecting, like a direct deposit from a customer or an automatic transfer from another account.
Subtract anything that reduced your account without your knowledge. Monthly maintenance fees and other service charges. Per-transaction fees. Automatic payments or electronic debits you forgot to log. If the bank bounced a check you had deposited because the writer didn’t have the funds (an NSF check), subtract the deposit amount and any fee the bank charged you for the return.
The result is your adjusted book balance. Then make these adjustments permanent by entering each one in your register so your running balance going forward reflects reality.
When the Two Sides Still Don’t Agree
Compare the two adjusted figures. If they match, you’re finished and that number is your verified cash balance.
If they don’t, the mistake is usually mundane. Check the direction of each adjustment first — it’s easy to add something you meant to subtract. Then check whether you missed an item on either side.
One trick worth knowing: if the difference between your two adjusted balances is evenly divisible by 9, you probably have a transposition error. That means two digits got swapped somewhere. Recording $540 as $450 produces a $90 difference, and 90 divides evenly by 9. Knowing the signature of the error narrows your search to amounts where a digit swap would create exactly the gap you’re seeing.
Bank errors do happen — a deposit posted to the wrong account, a check cleared for the wrong amount — but they’re uncommon. If you find one, call the bank and treat the correction as an adjustment on the bank side.
Why Reconciling Promptly Protects You From Fraud Liability
Catching mistakes is one reason to reconcile. The other is that federal law uses your statement date as the clock for reporting unauthorized activity, and the penalties for missing those windows are severe enough that a casual approach gets expensive fast.
Forged Checks and Altered Signatures
Under the Uniform Commercial Code, you have a duty to review your statements and report any unauthorized signature or alteration. If the same person forges multiple checks, you lose the right to recover on any check the bank pays more than 30 days after your statement was made available, unless you notified the bank within that window. And there is an absolute one-year cutoff: if you don’t discover and report an unauthorized signature or alteration within one year of receiving the statement, you cannot make a claim against the bank at all.1Legal Information Institute (LII). UCC 4-406 – Customer’s Duty to Discover and Report Unauthorized Signature or Alteration
Unauthorized Electronic Transfers
Debit card charges, ACH withdrawals, and online transfers fall under Regulation E, which uses a tiered liability structure that worsens the longer you wait:
- Report the loss or theft of your card or access credentials within two business days of learning about it, and your maximum liability is $50.
- Report after two business days but within 60 days, and liability can rise to $500.
- If an unauthorized transfer appears on your statement and you don’t report it within 60 days of the statement being sent, you are liable for the full amount of any unauthorized transfers that occur after that 60-day window closes.
The third tier is the one that catches people out. A single skipped reconciliation can mean unlimited liability for ongoing fraud. No agreement with your bank can make these limits worse than the regulation allows.2Consumer Financial Protection Bureau. Regulation E – Liability of Consumer for Unauthorized Transfers
Monthly reconciliation aligned with your statement cycle is the minimum frequency that keeps you inside these windows. Weekly is better if your volume is high. Pick a schedule you’ll actually keep, and run the reconciliation within a few days of receiving each statement.
What to Do With Checks That Have Been Outstanding for Months
Reconciliation surfaces another problem on its own: checks that have been sitting on your outstanding list cycle after cycle. Under the Uniform Commercial Code, a bank has no obligation to honor a personal or business check presented more than six months after its date, though the bank may still choose to pay it in good faith. U.S. Treasury checks remain valid for one year.
A check that has been outstanding for six months or more creates a bookkeeping problem. You subtracted the amount from your register when you wrote it, and you’ve been carrying it as an outstanding item on every reconciliation since. At some point you need to decide: void the check and add the amount back to your balance, or reissue it. Either way, contact the payee first so you know whether they still intend to cash the original.
Businesses have an additional obligation. Every state requires businesses to turn over funds from uncashed checks to the state’s unclaimed property office after a dormancy period, which varies by state but commonly runs from one to five years. Ignoring an old outstanding check doesn’t make the money yours; it eventually becomes the state’s. Reconciliation is where you catch these before they become a compliance issue.