Year-End Bookkeeping Checklist: Close Your Books Cleanly
The end of the year is when small bookkeeping errors turn into bigger problems. If your books are not clean before you hand them to a tax preparer, you will either pay more in preparation fees or risk filing inaccurate returns. A structured year-end close catches issues while there is still time to fix them.
Reconcile Every Account
Start by reconciling all bank and credit card accounts to their December statements. Every transaction should be matched, and the ending balance in your bookkeeping software should agree with the actual bank statement. If there is a discrepancy, track it down before it carries into the new year.
Check savings accounts, PayPal, Stripe, and any payment processor accounts too. If you use multiple credit cards for business spending, each one needs its own reconciliation. Do not forget about accounts you rarely use — an inactive account with a lingering balance is a common source of errors.
Clean Up Misclassified Transactions
Run a transaction report for the full year and scan for obvious categorization mistakes. Common ones include:
- Personal expenses coded to business accounts
- Loan principal payments recorded as regular expenses instead of reducing the loan liability
- Asset purchases coded to supplies or repairs
- Meals coded to office expense or vice versa
Fix these before your tax preparer sees them. Every reclassification they have to make is billable time on your invoice.
Review Outstanding Checks and Deposits
Look at uncashed checks and deposits in transit. A check you wrote months ago that still has not been cashed may need to be voided and reissued, or it may be stale enough to need a different treatment. Deposits in transit are usually fine, but you want to understand why each item is still outstanding.
If you have old uncashed checks sitting on your books, talk to your accountant about whether they should be voided. Some states treat uncashed vendor checks as unclaimed property, which has its own reporting rules.
Verify Loan Balances
Pull the year-end statement for every business loan, line of credit, or equipment financing arrangement. The loan balance on your balance sheet should match what the lender says you owe. If it does not, the interest expense or principal split was probably entered incorrectly at some point during the year.
This matters because your balance sheet feeds directly into your tax return. A wrong loan balance means wrong interest expense, which means wrong taxable income.
Count Your Inventory
If you carry inventory, do a physical count as close to December 31st as possible. The inventory value in your bookkeeping software should match what is actually on the shelf. Make adjustments for damaged, obsolete, or missing items.
This matters for both your balance sheet and your cost of goods sold. If your ending inventory is wrong, your COGS is wrong, and your taxable income shifts with it.
Check Your 1099 Readiness
Before the calendar year ends, confirm that you have W-9 forms on file for every contractor you paid $600 or more during the year. If you are missing any, request them now. It is much harder to chase down contractors in January when everyone is buried in tax season.
Also review your contractor payments to identify any that were made via credit card or a third-party payment network. Those payments are reported on Form 1099-K by the payment processor, not on Form 1099-NEC by you.
Review Accounts Receivable
Look at every outstanding invoice. For anything that is old and unlikely to be collected, consider writing it off as bad debt. Stale receivables that sit on your books indefinitely distort your financial picture.
Send reminders on overdue invoices while the year is still fresh in your customers' minds. The longer an invoice ages, the harder it is to collect.
Confirm Payroll Is Finalized
Make sure your final payroll run of the year has been processed and recorded in your books. If you use a payroll service, verify that all quarterly and annual filings are scheduled.
If you made any manual bonus payments or off-cycle payments outside your normal payroll system, make sure those are recorded and properly classified as wages, not as random expenses.
Organize Supporting Documents
Gather year-end statements for all loans, credit cards, bank accounts, and investment accounts. Collect documentation for major purchases, new lease agreements, and any new debt taken on during the year.
Having everything organized before you meet with your tax preparer saves time and reduces the chance of something being overlooked.
Lock the Period
Once everything is reconciled, reviewed, and corrected, lock the closed period in your bookkeeping software. This prevents accidental or unauthorized changes to prior-period data after you have finalized your books and potentially filed your tax return. Most accounting platforms let you set a closing date and password — use it.
A clean year-end close takes discipline, but it is far cheaper than discovering problems during an audit or after a filing deadline has passed. If you would rather not tackle this process alone, TwoDayBooks handles reconciliation, categorization, and year-end prep so your books stay clean and organized every month — not just in December.