The first thing to check is whether your bank and credit card accounts have been reconciled every month. Reconciliation means the ending balance in your accounting software matches the ending balance on your bank statement to the penny. If those two numbers don’t agree, something is either missing or entered incorrectly. This is the most basic accuracy test and the one most commonly skipped.

Next, look at your balance sheet. This is where problems hide. Check for negative balances in bank or asset accounts, because that usually means a payment was recorded without the corresponding deposit, or transactions were duplicated. Look at accounts receivable and ask yourself whether you actually have that much money owed to you. If invoices from six months ago show as unpaid but the client already paid, the payment was either not recorded or applied incorrectly. Do the same with accounts payable. If it says you owe a vendor you’ve already paid, something is wrong.

Pull up your profit and loss statement and compare it to what you know about your business. If you brought in roughly $40,000 last month but your P&L shows $28,000, revenue is either being miscategorized or deposits aren’t being recorded. The same applies to expenses. If your rent is $3,000 a month but the books show $6,000 in one month and zero the next, entries are being duplicated or missed.

Check for a large “uncategorized” or “ask my accountant” balance. Every transaction should be categorized to a specific account. A growing bucket of uncategorized items means someone is pushing decisions down the road instead of classifying things properly. Those uncategorized amounts throw off every report you pull.

One often overlooked check is comparing your QuickBooks payroll totals to your actual payroll reports. If you run payroll through a provider like Gusto or ADP, the amounts recorded in your books should match exactly what the payroll service shows. Discrepancies here affect both your expenses and your tax liabilities.

If you’re doing your own books and you’re not sure whether they’re right, that uncertainty is usually a sign they need a review. Full-service bookkeeping includes these checks as part of the monthly process so that problems get caught when they happen, not months later when they’re harder to trace.

Accurate books aren’t just about satisfying the IRS. They’re about having numbers you can actually trust when making decisions about hiring, buying equipment, or taking on new work. If you don’t trust the numbers, you end up making gut decisions instead of informed ones. A professional handling your small business bookkeeping gives you confidence that what you’re looking at reflects reality, and that’s the whole point.