Are Your Books Ready for Year-End Audit and Tax Prep?

7 min read · Published by Finite, LLC · Checked for technical accuracy by Sonny Senulis, CPA on September 25, 2026.

The Year You Just Had

You have had a real year. Customers were served, people were paid, problems were solved, and the business is still standing at the end of it, which is more than many can say.

Somewhere in the fourth quarter, the year also has to be closed on paper. The bank wants financial statements. The tax return has a deadline. If there is an audit, an auditor will arrive with a list of questions and a fee that assumes the books are in order.

The Question Nobody Asks in October

Ask most owners in October whether their books are ready for year-end, and the answer is that the bookkeeper is on top of it. The bank balance looks right. Invoices go out. Bills get paid.

The question almost nobody asks is different: does every balance on the balance sheet have a reconciliation and a document behind it, dated within the last month?

The income statement gets attention because it says how the business did. The balance sheet gets much less, because it only says what the business has and owes. Yet the balance sheet is where the year-end problems live. Every mistake that was never corrected on the income statement ends up sitting in a balance sheet account, and it stays there, quietly, until someone reconciles it.

The income statement tells you how the year went. The balance sheet tells you whether that story is true.

Why the Fourth Quarter Is Harder Than It Looks

There are practical reasons this catches good businesses out.

The fourth quarter is often the busiest operating quarter. The same people who would clean up the books are handling year-end sales, staffing and collections. Accounting gets what time is left.

Small timing differences build up over a year. A bill for December work that arrives in January, a customer deposit for next year's work received in December, an equipment purchase recorded as an ordinary expense: each one is small on its own. Together they can move the profit for the year by a meaningful amount.

And the auditor or tax preparer arrives after the year has ended. Their questions land in February and March, when the facts are three or four months old and the people who knew the answers are busy with the new year.

What It Costs When the Books Are Not Ready

Here is an illustrative example. The business is made up, and the numbers are simplified so you can follow the arithmetic.

A contractor with $8,000,000 in annual revenue has a December year-end. Its bank requires audited financial statements by April 30 to renew a $1,500,000 line of credit. The owner's books show a profit of $410,000 for the year.

The audit begins in February. In the first two weeks, the auditors find the following:

• The bank account has not been reconciled since August. The reconciliation finds $22,000 of vendor bills recorded twice and a $9,000 customer payment that was never posted. Cash is $31,000 better than the books showed, and expenses are $22,000 lower.
• A $60,000 piece of equipment bought in July was recorded as an expense. Under the company's own policy it should have been recorded as an asset and depreciated over five years. Correcting it removes $54,000 of expense from the year ($60,000 less a half year of depreciation, $6,000).
• $140,000 of customer deposits received in December, for jobs starting in January, were recorded as revenue. They are not revenue yet. They are a liability until the work is done.
• $95,000 of work completed in December was not invoiced until January and was recorded nowhere at year-end. It belongs in December's revenue.
• $70,000 of subcontractor invoices for December work arrived in January and were recorded there. They belong in December's expenses.

Add it up. Profit rises by $22,000 for the duplicated bills and by $54,000 for the equipment. It falls by $140,000 for the deposits. It rises by $95,000 for the unbilled work and falls by $70,000 for the late invoices. The net effect is $22,000 plus $54,000 minus $140,000 plus $95,000 minus $70,000, which is a decrease of $39,000. The year's profit is $371,000, not $410,000.

That is a 10 percent change in the one number the owner had been planning around. Now count what it cost to find out this way.

• The audit was quoted at $28,000 on the assumption of reconciled books. The cleanup takes the audit team an extra 60 hours at $200 an hour, which is $12,000 more, for a total of $40,000.
• The statements are delivered in June instead of March. The bank extends the line month to month at a higher rate until they arrive, and asks for a personal guarantee it had not required before.
• The tax return goes on extension, and the estimated payments for the new year were set from the wrong profit.
• The owner made two decisions in January on a $410,000 profit: a $50,000 bonus pool and an equipment order. Both were reasonable on the number they had. Both would have been sized differently on the real one.

The auditor did not make the profit lower. It was $371,000 all along. The books said $410,000 because nobody had reconciled them. A balance sheet check in November would have found every one of these items, with time to fix them.

What Ready Looks Like

None of this is complicated. All of it takes discipline.

• Every balance sheet account has a reconciliation, prepared by one person and reviewed by another, with a schedule or a document that supports the balance.
• Cutoff rules are written down and applied. Revenue is recorded when the work is done, not when the invoice happens to go out. Expenses are recorded when the cost is incurred, not when the bill arrives.
• The fixed asset register agrees to the general ledger, and this year's purchases and disposals are on it.
• There is a closing checklist with an owner and a date for each item, and it was used at least at the last quarter-end, not only at year-end.
• The trial balance handed to the auditor or tax preparer does not move after it is handed over. When it moves, every change costs someone hours.

When the books look like this, the audit is a confirmation rather than an investigation. The tax return is prepared from numbers that hold. And the profit the owner planned around in January is still the profit in April.

What You Can Do Starting Monday

You do not need to be an accountant to run a first check. You need an afternoon, your balance sheet and some honesty.

• Print the balance sheet as of the end of last month. Go down it one line at a time. For each balance, ask for the reconciliation and the document behind it. Write down every balance that has neither.
• Ask when each bank, credit card and loan account was last reconciled. Anything older than 30 days goes on the list.
• Ask three cutoff questions: Is there December work that will be invoiced in January? Are there December costs whose bills will arrive in January? Were any customer deposits for next year recorded as this year's revenue?
• Look for balances that have not changed in a year. An unchanged balance is usually an unexplained one.
• Take the list to whoever keeps your books and agree on a date for each item, before the year closes.

If the list is short, you are in good shape, and the year-end will be quick. If the list is long, you have found out in time, which is the whole point.

A Second Set of Eyes

You have done the hard part. You built a business worth auditing, with a bank that wants to lend to it and a tax bill that reflects real profit.

The question is whether the numbers that will represent that year, to your bank, to the tax authorities and to yourself, are ready to be looked at closely. Sometimes the answer is yes. Sometimes a fresh look at the balance sheet turns up a deposit, a cutoff or an old balance that changes the picture while there is still time to fix it.

Our team at Finite helps owners get their books ready before year-end, and steps in when an audit or a tax return has uncovered more than expected. If you would like someone to look at your balance sheet before your auditor does, we would be glad to have that conversation with you.