How to Do a Bank Reconciliation (Small Business Guide)
A bank reconciliation is the monthly check that your own records and your bank statement agree. You take the ending balance your books show, take the ending balance the bank shows, explain every dollar of the gap between them with a short list of timing differences and bank-only items, and confirm both sides land on the same adjusted figure. When they match, the month is proven complete. When they don't, you have just found a missing transaction, a duplicate, or an error before it reached your tax return.
Most explanations of bank reconciliation are written for an accounting student or a corporate controller closing a general ledger. This one is for the freelancer or small business owner who wants their books to be right, and it starts where your real record starts: the bank statement extractor and the actual document the IRS expects you to keep.
What Is a Bank Reconciliation?
A bank reconciliation compares two records of the same cash: the balance in your books (your checkbook, spreadsheet, or accounting app) and the balance on your bank statement. The two rarely match on any given day, and that is normal. Your books record a transaction the moment it happens; the bank records it when the money settles, which can be days later. Reconciliation is the process of listing those differences, confirming each one is legitimate, and arriving at a single corrected balance both records agree on.
The IRS treats this as ordinary recordkeeping, not an optional exercise. Publication 583 calls the business checkbook "your basic source of information for recording your business expenses," and in its "Reconciling the checking account" section it tells owners plainly: "When you receive your bank statement, make sure the statement, your checkbook, and your books agree." A worked bank reconciliation is item 7 in the sample recordkeeping system the same publication walks through.
Reconciliation applies whether you keep books on a cash or accrual basis. It is a cash-account control, so it runs the same way regardless of when you recognize income and expenses. If you are catching up after falling behind, do the reconciliation last, after you have rebuilt each month (our bookkeeping cleanup guide covers that order).
Why the Bank Balance and Your Book Balance Differ
The gap between the two balances is not a mystery to solve from scratch every month. It is made of a small set of predictable items, and every one falls into one of two buckets: timing differences the bank hasn't caught up to yet, and bank-only entries your books haven't caught up to yet.
| Reconciling item | Where it appears first | What you do |
|---|---|---|
| Deposit in transit | In your books; not yet on the bank statement | Add to the bank balance |
| Outstanding check or unposted payment | In your books; hasn't cleared the bank | Subtract from the bank balance |
| Bank service charge or fee | On the bank statement; not yet in your books | Subtract from the book balance |
| Interest earned | On the bank statement; not yet in your books | Add to the book balance |
| Returned (NSF) payment | On the bank statement; not yet in your books | Subtract from the book balance |
| Book error (transposition, duplicate, omission) | In your books only | Correct the book balance up or down |
The rule of thumb: timing differences (deposits in transit, outstanding checks) adjust the bank side, because your books already know about them and the bank will catch up. Bank-only items (fees, interest, returned payments) adjust the book side, because the bank already knows and your books haven't recorded them yet. Errors get corrected wherever they were made, which for a solo business is usually the book side.
The Bank Reconciliation Steps
Publication 583 lays out the core procedure, and it works the same in a paper checkbook or a modern app. Five steps take you from two disagreeing balances to one proven figure.
- Start with both ending balances. Note the closing balance on the bank statement and the balance your books show on the same date.
- Compare deposits. Match each deposit on the bank statement to a deposit in your books. Any deposit in your books that the statement doesn't show yet is a deposit in transit.
- Compare withdrawals and checks. Match each cleared check and debit to its entry in your books, then mark it as cleared. Anything in your books not yet marked is an outstanding check or unposted payment.
- Add the bank-only items to your books. Record the service charges, interest, and any returned payments the statement shows that your books missed. As Publication 583 puts it, "update your checkbook and journals for items shown on the reconciliation as not recorded (such as service charges) or recorded incorrectly."
- Prove both sides. Adjust the bank balance for the timing differences and the book balance for the bank-only items and corrections. If the two adjusted balances match, you are reconciled. If not, the difference is the size of the mistake still to find.
That last step is the whole point. A reconciliation that "almost" ties out is a reconciliation that has not found something.
A Worked Monthly Bank Reconciliation
Here is a full month for a freelance designer who banks through one business checking account. At month end her books show a balance of $9,510.00, and the bank statement shows an ending balance of $9,120.00. A $390 gap. Reconciling explains all of it.
Two things happened that the bank hasn't posted yet. A $1,200 client payment she deposited on July 31 doesn't appear on the statement (a deposit in transit). Check #1043 to a subcontractor for $650 and an $180 ACH bill she scheduled have not yet cleared (outstanding items totaling $830). Two things happened that her books hadn't recorded: the bank credited $10 of interest and charged a $30 monthly account fee.
| Bank side | Amount | Book side | Amount |
|---|---|---|---|
| Bank statement ending balance | $9,120.00 | Book (checkbook) balance | $9,510.00 |
| Add: deposit in transit | +$1,200.00 | Add: interest credited | +$10.00 |
| Subtract: outstanding items | −$830.00 | Subtract: account service charge | −$30.00 |
| Adjusted bank balance | $9,490.00 | Adjusted book balance | $9,490.00 |
Both sides land on $9,490.00, so the account is reconciled: on the bank side $9,120 + $1,200 − $830 = $9,490, and on the book side $9,510 + $10 − $30 = $9,490. The two adjustments she made to her books this month, recording the $10 interest and the $30 fee, are real entries she now has to keep; the deposit in transit and the outstanding checks need no entry because her books already have them. Next month, when that $1,200 deposit and check #1043 clear, they drop off the reconciling list.
What a Clean Reconciliation Catches
Reconciling is worth the twenty minutes because of what surfaces when the two sides refuse to match. Each of these is a real problem a monthly reconciliation catches while it is still cheap to fix.
- A charge with no receipt. When the statement shows a $220 supplier payment your books didn't record, you have found both an unrecorded expense and, likely, a missing receipt. Recording it recovers a deduction you would otherwise have lost. Matching each statement line to its supporting document is exactly what a bank statement extractor automates: it flags the charges that have no receipt behind them.
- A duplicate entry. If a $60 software charge got recorded twice in your books, your book balance is $60 low and the reconciliation won't tie out until you delete the duplicate. Left alone, that duplicate overstates your expenses and understates your profit on your Schedule C.
- A transposition. Recording a $154 payment as $145 leaves a $9 gap. Small, but a reconciliation that has to be exact is the only routine that reliably catches a nine-dollar error.
- A charge you didn't make. An unfamiliar debit that clears the bank is either a subscription you forgot or fraud. Reconciling monthly is how an unauthorized charge gets spotted in time to dispute it.
Reconciling your credit card statement works the same way, and matters just as much for the card you run business spending through. The mechanics of matching card charges to receipts are covered in our guide to the credit card statement versus the receipt.
How Often Should You Reconcile?
Once a month, when the statement closes, for every account the business uses: checking, savings, and each business credit card. Monthly is frequent enough that any given reconciliation covers a manageable number of transactions, and it lines up with the statement cycle, so there is a natural stopping point. Waiting a quarter means three times the transactions to match and a cold trail on any charge you no longer remember.
The IRS does not mandate a reconciliation schedule, or any particular bookkeeping system at all. Its recordkeeping guidance says "you may choose any recordkeeping system suited to your business that clearly shows your income and expenses," and that "except in a few cases, the law does not require any special kind of records." The standard is accuracy, not a specific form. A monthly reconciliation is the most reliable way to keep the records "clearly showing" the right numbers, so that at tax time your profit figure is defensible and every expense on it ties to a real transaction.
That reliability is where a tool earns its place. Pulling each month's transactions off a PDF statement by hand is the slow part; the bank statement extractor reads a PDF, CSV, or Excel statement, lists every transaction with its date, amount, and payee, and flags the charges with no matching receipt. From there the reconciliation is a short list of timing differences rather than an afternoon of retyping. When you are ready to try it, you can get started and reconcile your first month.
Frequently Asked Questions
What is the difference between the bank balance and the book balance? The bank balance is what your bank statement shows; the book balance is what your own records show. They differ because of timing (deposits and checks your books have recorded but the bank hasn't processed yet) and bank-only items (fees, interest, and returned payments the bank has posted but your books haven't). Reconciliation explains the gap and confirms both adjust to the same figure.
Is a bank reconciliation required by the IRS? No specific reconciliation is required, and the IRS does not prescribe a bookkeeping method. But Publication 583 expects your statement, checkbook, and books to agree, and the law requires records that accurately support the income and expenses on your return. Monthly reconciliation is the practical way to meet that standard.
Do I still need to reconcile if I use accounting software? Yes. Software can import transactions and suggest matches, but it cannot know that a $220 charge is missing its receipt or that a deposit was recorded twice until you confirm the two balances tie out. Reconciliation is the review step that turns imported data into trusted books.
What is a deposit in transit? Money you have received and recorded in your books, but that the bank has not yet posted to your account, usually because you deposited it near the end of the statement period. It is added to the bank side of the reconciliation because the bank will catch up next cycle.
What if my reconciliation doesn't balance? The unexplained difference is the size of the error to find. Recheck for a transposed figure, a transaction recorded twice or not at all, or an amount entered with the wrong sign. A difference divisible by 9 often points to a transposition; a difference that is exactly a transaction amount often points to a duplicate or omission.
Key Takeaways
- A bank reconciliation confirms your books and your bank statement agree, by explaining every dollar of the gap and adjusting both sides to one matching balance.
- The gap comes from the same short list every time: deposits in transit and outstanding checks adjust the bank side; fees, interest, and returned payments adjust the book side; errors get corrected in your books.
- Prove it to the penny. A reconciliation that nearly ties out is one that has not yet found the missing, duplicated, or mistyped transaction.
- Reconcile every account monthly, when the statement closes, so each pass covers a manageable batch and the trail is still fresh.
- The IRS requires accurate records that support your return, not a particular format; monthly reconciliation is the most dependable way to keep them accurate and your deductions defensible.