Reconciliation in bank accounts means comparing the bank's record of an account with your own ledger, finding every reason the two balances differ, and adjusting both until they agree. The bank and the books rarely match on any given day, because each records the same money at different times and sometimes in different amounts.
What does reconciliation in bank accounts prove?
A finished reconciliation proves that every difference between the bank balance and the book balance has a named cause, and that after those causes are applied both sides land on the same figure. Two balances that happen to match prove nothing on their own. The explanation behind the match is the evidence.
Think of the reconciliation as a short argument with three parts. The first part says what the bank holds on the statement date. The second says what your ledger holds on the same date. The third lists, item by item, why those figures differ and what they become once the items are applied. If a reader can follow that argument and check each item to a document, the cash balance on the balance sheet is supported.
What a reconciliation does not prove
A reconciliation does not prove that the ledger is right about everything. It proves the ledger agrees with the bank after known items. A payment coded to the wrong expense account still reconciles, because the cash side is correct. A customer deposit credited to the wrong customer still reconciles for the same reason. The reconciliation guards the cash account; other reviews guard the accounts on the other side of each entry.
The example used in this post
The table below is an example for one month at a fictional company. Every figure is made up for illustration.
| Bank side (per statement) | Amount | Book side (per ledger) | Amount |
|---|---|---|---|
| Balance per bank statement | 48,215.60 | Balance per ledger | 52,610.25 |
| Add: deposit in transit (bank side) | 6,340.00 | Less: NSF check returned (book side) | (2,100.00) |
| Less: outstanding checks (bank side) | (4,120.35) | Less: monthly service fee (book side) | (75.00) |
| Adjusted bank balance | 50,435.25 | Adjusted book balance | 50,435.25 |
Both adjusted balances equal 50,435.25. That equality, with every line above it traceable to a document, is what the reconciliation proves. The sections below explain where each line comes from.
Why the bank balance and the book balance disagree
The two balances disagree for two reasons: timing and error. Timing differences are normal and expected, such as a check written but not yet cashed. Errors are mistakes by you, the bank or a third party. A reconciliation separates the two, because timing items resolve themselves and errors need correcting.
Timing differences
You record a check in your ledger the day you write it. The bank records it the day the payee deposits it, which may be days or weeks later. Until then the check is outstanding: your books show the money gone and the bank still shows it. A deposit works the other way. If you record Friday's deposit and the bank posts it Monday, the deposit is in transit. The detail of both lives in outstanding checks and deposits in transit, and the short version is that both fix themselves once the bank catches up.
Items the bank knows about first
Some items reach the bank before they reach your ledger. Service fees, interest credited, a returned deposit item, a direct debit set up by someone else and a wire received are typical. None of these is an error, but your books do not have them until you record them. In the example above, the NSF check and the service fee are of this kind. An NSF check is a customer's check the customer's bank returned for insufficient funds.
Errors
Errors come in several forms: a transposed number in your ledger, a deposit entered twice, a check recorded for the wrong amount, or a bank mistake such as posting another customer's transaction to your account. Errors are rarer than timing items but matter more, because they do not clear with time.
Bank-side versus book-side reconciling items
A bank-side item is one the bank has not yet reflected but your books already have, or one the bank got wrong. A book-side item is one the bank has reflected but your ledger has not. The rule decides where the adjustment goes and, more importantly, whether anyone must post a journal entry.
The practical test is simple: ask which record needs to change.
- Bank-side items change the statement figure on the reconciliation only. Deposits in transit, outstanding checks and bank errors belong here. Nothing is posted to your ledger for a timing item, because the ledger is already right.
- Book-side items change the ledger figure and need an entry. Bank fees, interest earned, NSF checks, direct debits you had not recorded and errors in your own entries belong here. The reconciliation shows the item, and a journal entry makes the ledger agree.
A bank error is a bank-side item that does not clear by itself. You report it to the bank and carry it on the reconciliation until the bank corrects it. A common slip is to book a bank error in the ledger to make the numbers agree. That moves the problem into your books and leaves the bank's mistake in place.
For the rule on which differences need an entry in practice, see which bank statement differences need a journal entry. The full month of figures behind a table like the one above is in a bank reconciliation example worked line by line.
Who should prepare and who should review a bank reconciliation?
The person who prepares the reconciliation should not be the person who handles cash, writes checks or records receipts, and a second person should review and sign the finished work. Separating the roles lets the reconciliation act as an independent check on the people who touch the money.
In a large company this is a matter of departments. In a small office there may be only two or three people, so the aim is a practical split rather than a perfect one. Some arrangements that work:
- Bookkeeper prepares, owner reviews. The owner does not need to redo the work. The owner reads the bank statement directly (not a copy the bookkeeper prepared), checks the adjusted balances agree, and looks at the list of outstanding items for anything odd.
- Cash handler never reconciles. If one person opens the mail, deposits receipts and writes checks, a different person should do the reconciliation. When that is impossible, the owner should at least receive the statement unopened.
- Outside accountant reviews quarterly. Where the owner is also the bookkeeper, an outside accountant can review a reconciliation each quarter and sign it.
A signature should mean something. The reviewer should record the date, and the preparer should record the date they finished. A reconciliation signed months after the statement date says little about the cash position at the time. When you review, start with what looks unusual: old outstanding checks, large adjustments with no document, and any item described only as "adjustment".
When a matching bank balance hides a reconciliation error
A matching balance can hide an error when two mistakes offset each other, when a reconciling item is made up to close a gap, or when the wrong figures were reconciled. The final equality is necessary but not sufficient, which is why a reviewer looks at the items and not only the result.
Four common ways a clean-looking reconciliation misleads:
- Offsetting errors. A deposit recorded 500.00 too high in the ledger and a check recorded 500.00 too low net to zero. The balances agree and both entries are wrong.
- A plug. The preparer finds a difference of 83.17 and enters "unreconciled difference" as an item. The totals match, but nothing explains the amount. The post on forcing a statement to balance with a plug covers why this hides the problem.
- A stale or invented outstanding check. Listing a check that was never written, or never removing one that cleared months ago, can bring two balances together. Each listed check should trace to a ledger entry and, later, to a cleared line.
- The wrong starting figure. Reconciling to a statement balance that was typed in, rather than read from the statement, can produce a perfect match with the wrong number. A statement that does not foot, meaning its opening balance plus deposits less withdrawals does not equal its closing balance, is a warning that the statement itself is incomplete. The check for that is covered in how footing and continuity checks work on a bank statement.
The remedy is to treat every reconciling item as a claim that needs support. Date, amount, source document and, for timing items, the later date they cleared. If an item has none of these, it is not a reconciling item yet.
PreciseBankFlow is built around that idea for the statement side of the work. It checks that each statement foots and lists the lines that do not clear against your ledger, so the evidence for each difference is on the page. The judgment about whether the explanation is acceptable stays with the person who signs. You can see how that looks on the PreciseBankFlow homepage.
Bank reconciliation versus bank statement reconciliation: same thing?
Yes. "Bank reconciliation", "bank statement reconciliation", "bank to book reconciliation" and "reconciling the bank account" all describe the same task: agreeing the bank's records with your ledger for one account at one date. The words differ by habit and by region, not by method.
There is one distinction worth keeping. "Bank statement reconciliation" puts the statement at the centre of the work, which is helpful to remember: the statement is the outside evidence, and the ledger is what you are testing against it. "Bank to book reconciliation" says the same thing from the other direction.
Reconciliation is also wider than banks. Accountants reconcile credit card statements, loan balances, payroll liabilities, accounts receivable and inter-company balances. Each follows the same logic of comparing two records and explaining the difference. If you want the general meaning across all account types, what account reconciliation means, with examples by account covers it. The bank account is the most common case, because the bank provides an independent record that you did not create.
When someone asks you to "do the reconciliation" without more detail, the safe reading is: pick the statement for the month, compare it with the ledger for the same dates, list and support every difference, post entries for book-side items, and sign. The procedure, step by step, is in how to reconcile bank statements in seven steps.