Bank Reconciliations: The Most Important Control in the Monthly Close

Banking

If you only do one reconciliation each month, it should be your bank reconciliation.

Bank reconciliations are the primary way you confirm that the cash balance in your books matches reality. Without them, every other financial report rests on an unverified foundation. Think of the bank reconciliation as the "sanity check" for your entire set of books. If the cash number is wrong, everything else—from your profit margins to your expense reports—is likely wrong too.

Overview

Use this guide to run clean reconciliations and protect cash accuracy.

This guide explains what a bank reconciliation is in plain language, why it matters so much for business health, how to perform one correctly step-by-step, common issues and red flags to watch out for, and best practices for the monthly close. By the end, you should feel confident that your cash numbers are solid.

What Is a Bank Reconciliation?

At its core, a bank reconciliation is a process of matching two separate records to see if they agree.

On one side, you have the cash balance in your accounting system (your books). This is what you think you have based on the checks you've written and the deposits you've recorded.

On the other side, you have the ending balance on your bank statement. This is what the bank says you have.

In a perfect world, these two numbers would always be identical. But in the real world, they almost never are. You might have written a check that hasn't been cashed yet, or the bank might have charged a fee you didn't know about.

The goal of the reconciliation is to identify and explain every single difference between these two balances. It’s not just about making the numbers match; it’s about understanding why they didn't match in the first place. A reconciliation isn’t complete until every difference is understood and explained.

Why Bank Reconciliations Matter

Bank reconciliations are critical because cash is the lifeblood of any business, and it is also the most easily misstated account.

Errors and fraud often show up here first. If someone is skimming money, or if a deposit was recorded twice by mistake, the bank reconciliation is where you will catch it.

Furthermore, many downstream accounts depend on cash accuracy. If you think you have more cash than you actually do, you might make bad spending decisions. If you think you have less, you might miss opportunities.

Finally, external parties like auditors, lenders, and tax professionals rely heavily on reconciled cash. It is the first thing they look at to judge the reliability of your financial statements. If your cash is wrong, everything built on top of it is suspect.

Where Bank Reconciliations Fit in the Monthly Close

Bank reconciliations should occur after all transactions for the month have been recorded but before any financial statements are finalized.

A typical workflow looks like this:

Record all transactions: Enter all checks, deposits, and payments for the month.
Get the bank statement: Wait for the official statement from the bank (usually available a few days after month-end).
Perform the reconciliation: Compare your books to the statement.
Investigate and fix: If there are differences you can't explain, dig in until you find the answer.
Review: Have someone else review the reconciliation if possible.
Finalize: Once the bank is reconciled, you can move on to reviewing other accounts and producing financial statements.

Skipping or rushing this step undermines the entire close process. You don't want to find a $5,000 error after you've already sent reports to the board.

How to Perform a Bank Reconciliation (Step by Step)

Step 1: Use the Bank Statement — Not the Online Balance

Always reconcile to the official bank statement, not the current online balance you see when you log in to your bank's website.

Why? Because online balances change constantly. A check might clear five minutes after you look. A bank statement, however, is a permanent record with a fixed cutoff date (usually the last day of the month). It provides a stable target to aim for. Reconciliations are about proving the accuracy of a specific period, not just checking today’s cash.

Step 2: Match Deposits

Start by comparing the deposits listed in your books to the deposits listed on the bank statement.

Go down the list one by one. If you see a deposit in your books that is also on the statement, check it off.

You are looking for:

Deposits in transit: These are deposits you recorded (maybe you drove to the bank on the 31st) but the bank hasn't processed yet. This is a valid timing difference.
Missing deposits: Did the bank miss a deposit? Or did you forget to record one?
Duplicate or misposted deposits: Did you accidentally record the same payment twice?

All statement deposits should either be matched to your books or explained as a timing difference.

Step 3: Match Withdrawals and Checks

Next, do the same for withdrawals, checks, and electronic payments.

Compare your list of outgoing payments to the bank's list.

Outstanding checks: These are checks you wrote and mailed, but the vendor hasn't cashed them yet. They are in your books but not on the bank statement. This is the most common timing difference.
ACH or card transactions: These usually clear quickly, but sometimes a payment made on the last day of the month won't show up until the 1st of the next month.
Errors: Did you record a check for $540 but the bank cashed it for $450? This is where you catch data entry errors.

Old outstanding checks (older than 90 days) should be reviewed. Why haven't they been cashed? Is the check lost? You may need to void and reissue it.

Step 4: Record Bank Adjustments

As you go through the statement, you will likely find items that are on the bank statement but not in your books. These are usually things you didn't know about until you saw the statement.

Common examples include:

Bank fees: Monthly service charges, wire fees, or overdraft fees.
Interest income: Small amounts of money the bank paid you.
Returned items: A customer check that bounced (NSF).

You must record these transactions in your books immediately. You cannot finish the reconciliation until your books reflect these real-world events.

Step 5: Confirm the Reconciled Balance (The "Zero" Moment)

Once you have matched everything and recorded all the bank adjustments, you are ready to finalize.

The formula is: Book Balance + Outstanding Checks - Deposits in Transit = Adjusted Bank Balance

Most accounting software handles this math for you. You enter the statement ending balance, and the software compares it to your cleared transactions.

If the difference is zero, congratulations! You are reconciled.
If the difference is not zero, you are not done. You must find the discrepancy. Never "force" a reconciliation by creating a "reconciliation discrepancy" expense entry just to make the problem go away. That hides errors and potential fraud.

Understanding Timing Differences

Timing differences are the main reason your books and the bank statement don't match on day one. They are normal and expected, but you need to understand them.

Checks in the Mail (Outstanding Checks): When you write a check and mail it on January 28th, you reduce your cash balance immediately in your books. However, the vendor might not receive and deposit that check until February 4th. On January 31st, your books say the money is gone, but the bank says the money is still there. This is a valid timing difference. You don't need to change your books; you just list this check as "outstanding."

Late Deposits (Deposits in Transit): If you receive a check from a customer on January 31st and drive it to the bank's night deposit box at 6:00 PM, you record the deposit in your books in January. But the bank won't process it until February 1st. Your books show more cash than the bank statement. This is also a valid difference.

Bank Fees and Interest: These are slightly different. The bank records them on the 31st, but you don't know about them until you get the statement. These represent a timing difference where you are the one who is "late." You must catch up by recording them in your books to match the bank.

Common Reconciling Items (and What They Mean)

When you are reconciling, you will encounter certain items repeatedly. Understanding what each one represents helps you categorize them quickly and accurately.

Outstanding Checks

These are checks you have written and recorded in your accounting software, but the recipient has not yet cashed them.

Example: You wrote a rent check on the 28th, but the landlord didn't deposit it until the 3rd of the next month.
Action: Leave these as "uncleared." They will clear in the next reconciliation. If they remain uncleared for months, investigate.

Deposits in Transit

These are deposits you have recorded in your books (perhaps you took cash to the night drop), but the bank hasn't posted them to your account yet.

Example: You deposit the daily sales on the 31st after 5 PM. The bank credits your account on the 1st.
Action: Verify they appear on the very next bank statement. If not, contact the bank immediately.

Bank Service Charges

Fees charged by the bank for maintaining the account, wire transfers, or overdrafts.

Example: A $15 monthly maintenance fee.
Action: Record this as an expense in your books (e.g., "Bank Service Charges").

Interest Income

Money the bank pays you for keeping funds in the account.

Example: A credit of $0.42 for interest earned.
Action: Record this as "Interest Income" (Revenue) in your books.

NSF Checks (Non-Sufficient Funds)

A check you received from a customer and deposited, but it "bounced" because the customer didn't have enough money.

Example: Customer A paid you $100. You deposited it. Three days later, the bank takes the $100 back plus a fee.
Action: You must reverse the payment in your books, re-open the customer's invoice, and likely charge them a fee.

Narrative Walk-Through: Finalizing the Reconciliation

So, you've clicked all the checkboxes. You've matched every deposit and every withdrawal. You've entered the $15 bank fee.

Now, you look at the "Difference" field on your screen. Ideally, it says $0.00.

This is the moment of truth.

Review the Report: Before you hit "Finish," look at the summary report. Does it make sense?
Check the "Uncleared" Items: Look at the list of transactions that didn't clear (the outstanding checks and deposits). Are there any old items from six months ago? If so, investigate them. Why are they still there?
Click Finish: Once you are satisfied, finalize the reconciliation. This usually "locks" the period for those transactions, preventing you from accidentally changing a cleared check later.
Save the Report: Always save a PDF copy of the reconciliation report. Attach it to the bank statement. This is your proof. If an auditor asks, "How do we know this cash balance is real?", you hand them this report.

If the difference is not zero, do not click finish. Go back.

Did you transpose a number? (e.g., entered $54 instead of $45)
Did you miss a transaction?
Did you clear a transaction that isn't on the statement?

Find the penny. It matters.

Red Flags to Watch For

During bank reconciliations, keep an eye out for these warning signs:

Large or unexplained reconciling items: If you have a "miscellaneous" difference of $500, that's a problem.
Old outstanding checks (90+ days): Checks don't stay in the mail for three months. Investigate these.
Frequent adjustments: If you are constantly making adjusting entries to balance the books, something is wrong with your process.
Reconciliations that “only work” one way: If you always have "extra" cash, or always are "short," there might be a recurring error or theft.
Cash balances that don’t align with reality: If your books say you have $1 million but you're getting overdraft notices, believe the notices.

These often point to deeper issues in the books or even potential fraud.

Bank Reconciliations and Fraud Prevention

Bank reconciliations are a key internal control. They are your first line of defense.

They help detect:

Unauthorized transactions: A check you didn't write, or a withdrawal you didn't authorize.
Duplicate payments: Paying a vendor twice.
Altered checks: You wrote a check for $100, but someone changed it to $1,000.
Missing deposits: Cash that was collected but never made it to the bank.

Ideally, the person reconciling the bank account should not be the same person who signs the checks or authorizes payments. This is called "segregation of duties." If the same person does both, they can steal money and cover it up in the reconciliation. Even small businesses should try to have a second set of eyes review the reconciliation report.

How Often Should Bank Reconciliations Be Done?

Monthly is the minimum standard for almost every business. You need to close the month to produce accurate reports, and you can't close the month without reconciling cash.

For high-volume businesses (like restaurants or retail) or businesses with very tight cash flow, you might want to reconcile weekly or even daily.

Year-end or tax-time reconciliations alone are not sufficient. Trying to reconcile 12 months of banking activity all at once is a nightmare and prone to errors. Regular reconciliation prevents backlog and surprises.

Common Bank Reconciliation Mistakes

Even experienced bookkeepers can fall into traps. Here are the most common mistakes to avoid:

Reconciling to the wrong date: Make sure the "statement ending date" in your software matches the actual date on the bank statement. If the statement ends on the 28th and you reconcile to the 31st, you will never balance.
Using online balances instead of statements: As mentioned earlier, online balances are fluid. Always wait for the PDF statement that marks the official end of the period.
Ignoring old reconciling items: It is tempting to ignore that one check from 2023 that never cleared. Don't do it. It clutters your books and might represent a real liability you still owe.
Forcing balances to match: Using a "plug" entry (e.g., "Reconciliation Discrepancy Expense") to make the difference zero is bad practice. It hides errors. Find the difference, no matter how small.
Treating reconciliations as optional: Skipping a month creates a snowball effect. The next month will be twice as hard. Make it a non-negotiable part of your monthly routine.
Failing to review reconciled results: Clicking "finish" isn't enough. Look at the report. Does the adjusted book balance make sense?

A reconciliation that isn’t reviewed is only half done.

Best Practices for Clean Bank Reconciliations

Reconcile every bank account every month: Don't skip the savings account or the PayPal account. If it holds money, reconcile it.
Save reconciliation reports: Store them safely. They are audit evidence.
Clear old items intentionally: Don't let old checks sit on the books forever. Void them or follow unclaimed property laws.
Investigate differences promptly: Don't wait until next month to figure out why you were off by $50. Do it now while the memory is fresh.
Review reconciliations before closing the books: The reconciliation is a prerequisite for the close, not an afterthought.

Consistency matters more than speed. It is better to take the time to get it right than to rush through and miss a critical error.

Final Thoughts

Bank reconciliations are not busywork—they are proof.

They prove that your cash balances are real. They prove that your transaction records are complete. They prove that you have caught any bank errors or internal mistakes. And ultimately, they prove that your financial statements can be trusted.

If your books feel shaky or you're unsure about your numbers, start with the bank reconciliation. Almost everything else depends on it.

Need help setting up or cleaning up bank reconciliations? BookkeeperGroup helps businesses implement clean, repeatable reconciliation processes that support accurate monthly closes and confident reporting.

Next steps

See bank reconciliation checklist
See examples with journal entries
See credit card reconciliation companion
See month-end close workflow

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