What Is Bank Reconciliation?
Bank reconciliation is the process of matching the cash balance on your bank statement to the cash balance in your general ledger. The two numbers rarely match exactly at month-end because of timing differences — deposits you recorded but the bank has not processed yet, checks you wrote that recipients have not cashed, and fees the bank deducted that you have not yet booked. Doing this comparison every month keeps your accounting profit reporting accurate and flags errors before they compound into bigger problems.
The reconciliation follows a simple structure: start with each side's ending balance, list the adjustments that explain why it differs, and confirm both adjusted totals agree. If they do not, something is wrong — either a missing transaction, a data-entry mistake, or an unauthorized charge. Companies that skip reconciliation often discover embezzlement, duplicate payments, or lost deposits months or years after the fact, when recovery is far less likely.
Small businesses feel the impact most. A single unrecorded $35 bank fee or an uncashed payroll check for $2,400 distorts monthly financials and can lead to overdrafts or incorrect tax filings if left uncaught.
Adjusting the Bank Statement Balance
The bank side of the reconciliation starts with the ending balance printed on the statement. You add deposits in transit — amounts you received and recorded in your books but that the bank had not yet credited as of the statement cut-off date. Then you subtract outstanding checks — checks you wrote and recorded but that have not yet cleared the bank account.
The result is the adjusted bank balance, which should equal the adjusted book balance when the reconciliation is complete. Tracking deposits in transit matters for cash flow forecasting because it tells you how much cash is technically yours but not yet available for spending. Large or old outstanding deposits may signal a processing problem with your bank or a customer payment that bounced.
Common errors on this side include forgetting to record a deposit entirely, entering the wrong check amount in the register, or missing an automatic deposit from a payment processor like Stripe or PayPal that hits the bank a day or two after the sale date.
Adjusting the Book Balance
The book side starts with the ending cash balance in your general ledger. Add interest earned that the bank credited but you have not yet recorded. Subtract bank service charges, monthly account fees, wire transfer fees, and any NSF check amounts that the bank reversed from your account.
If your company carries a loan with the same bank, the bank may automatically deduct loan payments — these need to be recorded in your books as well. The same goes for amortization entries on loans where the bank handles escrow disbursements for taxes or insurance from your account.
Each adjustment should trace back to a specific journal entry. Bank fees get debited to an expense account. Interest income gets credited to a revenue account. NSF checks reset the receivable balance, since the customer still owes you the money — the collection process starts over, and tracking AR days helps you monitor how long receivables sit unpaid.
Common Reconciliation Discrepancies
When the adjusted balances do not match, the gap usually traces to one of a handful of causes. Transposed digits — writing $846 instead of $864 — account for a surprising share of reconciliation failures. Missing entries for recurring bank debits like merchant processing fees or monthly software subscriptions are another frequent culprit.
Automated clearing house (ACH) transactions create timing issues. A vendor might pull payment on the 1st, but your accounting system logs it on the 3rd. Interest credits on savings or money market accounts often post at month-end with amounts that differ slightly from what you estimated when you recorded the accrual.
In multi-currency accounts, exchange rate differences between the transaction date and the bank settlement date create small variances. These are legitimate and usually resolve in the following period, but documenting them prevents confusion during audits and keeps the reconciliation log clean.
Handling NSF Checks and Bank Fees
NSF checks are checks you deposited from a customer that the bank returned unpaid because the customer's account lacked sufficient funds. The bank reverses the deposit, so you must deduct the check amount from your book balance and re-establish the receivable. The customer still owes the money, and you may also charge them a returned-check fee.
Bank fees come in several forms: monthly maintenance charges, per-item fees for checks written, wire transfer fees, overdraft fees, and merchant processing fees deducted before deposits hit your account. Reviewing your monthly fee schedule against actual charges can reveal APR discrepancies or unexpected fee hikes that warrant a conversation with your banker.
For small businesses processing a high volume of transactions, even a $0.25 per-item fee adds up across hundreds of monthly checks. Recording these fees promptly each month keeps your book balance close to the bank balance and reduces the reconciliation effort at period-end.
Reconciliation Frequency and Best Practices
Monthly reconciliation is the minimum standard. Companies with high transaction volumes — retailers, restaurants, e-commerce operations — benefit from weekly or even daily reconciliation to catch errors faster and maintain tighter break even control over cash positions and expense timing.
Set a cutoff date and stick to it. Reconcile the same period each month so the cadence becomes routine. Assign reconciliation to someone who does not handle cash receipts or disbursements directly — separation of duties reduces the risk of fraud going undetected and is a standard internal control expectation.
Keep supporting documentation for every adjustment. Bank fee notices, NSF notices, and deposit slips should be filed or scanned into your accounting system. If your books are ever audited, a clean reconciliation trail with attached documents makes the process smoother and demonstrates financial discipline.
Using Accounting Software for Reconciliation
Modern accounting platforms like QuickBooks, Xero, and Wave automate much of the reconciliation process. They connect directly to your bank feed, match transactions to recorded entries, and flag unmatched items for review. The adjustments — marking deposits in transit, identifying outstanding checks — happen semi-automatically within the software interface.
Software does not eliminate the need for human review. Bank feeds can drop transactions, duplicate entries, or miscategorize transfers between accounts. Reviewing the unreconciled items list each month catches these issues before they distort reporting. Tools that calculate financial health indicators like the Altman Z score pull data from reconciled accounts, so unresolved discrepancies cascade into misleading metrics.
For businesses with multiple bank accounts or credit cards, reconcile each account separately. Mixing accounts in a single reconciliation worksheet is a common source of errors that can take hours to untangle when something does not balance.
Reconciliation as an Audit-Ready Practice
A completed bank reconciliation is one of the first documents an auditor requests. It proves that the cash balance on your financial statements ties back to an independent third party — the bank. Clean monthly reconciliations signal strong internal controls and reduce the likelihood of a deep-dive audit procedure.
Save each month's reconciliation as a PDF with the bank statement attached. This creates a time-stamped record showing exactly what adjustments were made and why. Investors and lenders often request recent reconciliations during due diligence, and having them organized improves confidence in your reported ROI figures and overall financial management.
Reconciliation also deters fraud. When employees know that someone reviews the bank account against the books every month, skimming schemes and unauthorized transfers become much harder to conceal. The Association of Certified Fraud Examiners reports that organizations performing monthly reconciliations detect fraud faster and suffer smaller losses than those that reconcile quarterly or less frequently.