This happens to almost every business owner at some point. The bank says one number, QuickBooks says another, and you’re left wondering which one is right. Usually the bank is right because that’s actual cash. QuickBooks reflects what’s been recorded, which may be incomplete or contain errors.

The most common cause is timing differences. You entered a check last week, but the vendor hasn’t cashed it yet. Or you recorded a customer deposit that’s still pending at the bank. QuickBooks shows what you expect to happen, but the bank only shows what has actually cleared. This kind of difference is normal and resolves itself once transactions process.

Duplicate transactions are another frequent culprit. This happens when bank feeds import a transaction automatically and you also entered it manually. The same expense or deposit gets counted twice, throwing off your balance. If your QuickBooks balance is higher than it should be for income or lower for expenses, duplicates are a likely suspect.

Missing transactions cause the opposite problem. Bank fees, automatic withdrawals, interest payments, or ACH debits that never got entered will make your bank balance lower than QuickBooks shows. If you don’t review the bank feed regularly, transactions can sit unmatched or fail to import entirely due to connection issues.

Transfers between accounts create problems when recorded incorrectly. Moving money from checking to savings should be a transfer, not income in one account and an expense in another. If you categorize transfers as regular transactions, your totals will be wrong even though the bank balances might look close.

Your opening balance could also be the issue. If QuickBooks started with an incorrect beginning balance, every month after that will be off by exactly that amount. This is especially common when QuickBooks setup happens without verifying the starting point against an actual bank statement.

The solution is reconciliation. This means going through the bank statement line by line and matching each transaction to what’s in QuickBooks. Whatever doesn’t match is your discrepancy. QuickBooks has a built-in reconciliation tool that walks you through this process. Once you identify what’s different, you can add missing transactions, delete duplicates, or correct miscategorized entries.

Reconciling monthly prevents small issues from becoming big mysteries. When you only reconcile once a year at tax time, finding a $200 discrepancy from eight months ago becomes nearly impossible. A transaction that takes two minutes to research in February takes an hour in December because you don’t remember what happened.

If your books haven’t been reconciled in months and the discrepancies have piled up, working with small business bookkeepers in New Mexico who can untangle the history is often faster than doing it yourself. Once the books are clean, staying current with monthly reconciliation keeps them that way.