The Small Business Month-End Close Checklist

Businesses that close their books monthly rarely dread tax season. Businesses that skip months tend to spend the spring reconstructing the year. A monthly close does not need to be elaborate. It needs to happen every month, in the same order, with someone accountable for it.

Why close monthly

• Errors are found while they are fresh. A duplicate payment or missing deposit is much easier to trace in the same month.
• You make decisions with current numbers. Pricing, hiring, and cash decisions rely on accurate reports.
• Tax prep gets faster. Twelve tidy months become an easy year.
• Estimates are more accurate. Quarterly estimated taxes rely on correct profit figures.
• Lenders and buyers trust records that show monthly reconciliation.

The timeline

Aim to finish within about 10 to 15 days after month end. Sooner is better, later is workable. Decide your target and stick to it.

The checklist

1. Collect statements and documents

• Bank and credit card statements for the month.
• Payment processor reports (card processors, invoicing platforms, marketplaces).
• Payroll reports.
• Loan statements.
• Receipts and invoices not yet attached.
• Sales tax reports if applicable.

2. Enter or review all transactions

Confirm that bank feeds have imported everything. Compare feed totals to statement totals. Enter any transactions that are not imported: cash, checks, and payments from other accounts.

3. Categorize and clear suspense

Review uncategorized items and categorize them. Question anything unusual. The uncategorized accounts should be zero at close. See chart of accounts basics.

4. Reconcile bank and card accounts

For every account, reconcile the ending balance in the software to the statement balance. Investigate differences, such as outstanding checks, timing of deposits, duplicates, and transactions from prior months. Do not force a reconciliation by adding a plug entry.

5. Reconcile payment processors and clearing accounts

Payment processors often deposit net of fees and on a delay. Make sure gross sales, fees, refunds, and payouts are recorded and the clearing account is zero or explained.

6. Review accounts receivable and payable

• Match customer payments to invoices.
• Review overdue invoices, and follow up on collections.
• Review unpaid bills and upcoming payment dates.
• Write off uncollectible amounts consistently with your policy.

7. Verify payroll

• Compare payroll reports to payroll expense in the ledger.
• Confirm payroll tax deposits were made and recorded.
• Confirm liability accounts (withholding, employer taxes, benefits) match the provider's reports.
• Check that owner wages match your plan. For S-corp owners, confirm salary ran as planned. See S-corp payroll for owner-employees and payroll tax deposits and filings.

8. Verify sales tax

• Compare sales tax collected to the liability account.
• Note filing due dates and amounts.
• Record payments. See sales tax nexus basics.

9. Review owner-related accounts

• Owner contributions, draws, and distributions: are they recorded correctly and consistent with the plan?
• Owner loans: any new loans or repayments, and are notes updated?
• Personal charges on business cards: reclassify.
• Expense reimbursements to the owner: supported by receipts. See accountable plan guide.

10. Fixed assets and prepaid items

• Record purchases above your capitalization threshold as assets.
• Record depreciation or track it for the tax return.
• Amortize prepaid insurance, subscriptions, and other prepaid items, if you track them.

11. Review the reports

Read the profit and loss statement and balance sheet:

• Compare to the prior month and the same month last year.
• Look for accounts with unusual balances, large swings, or negative balances where positive is expected.
• Confirm that net income looks plausible given what you know happened.
• Check that cash matches your expectation.
• Look at gross margin and key expense ratios.

12. Adjusting entries

Post necessary adjustments: accruals if you use the accrual method, deferred revenue, depreciation, corrections for misposted items. Document each adjustment. See cash vs accrual accounting.

13. Lock the period

Once reviewed, set a closing date in your software to prevent changes to prior periods without authorization. Save PDF copies of the month's key reports.

14. Set up the next month

• Update the tax savings transfer.
• Schedule owner distributions or draws.
• Confirm upcoming due dates: payroll, sales tax, estimated tax. See small business tax calendar.
• Note items to follow up.

Quarter-end additions

At quarter end, add:

• Estimated tax calculation and payment.
• Payroll quarterly return reconciliation (Form 941 and state returns).
• Review of profit against forecast, and salary or distribution adjustments for S-corp owners. See setting your owner salary.
• Review of contractor payments for 1099 readiness. See information returns and 1099-NEC.

Year-end additions

• Physical inventory count if applicable.
• Fixed asset review.
• Shareholder or member basis update.
• Reconcile loans and interest.
• Prepare 1099s and W-2s.
• Provide the tax preparer with a complete package.
• Review entity compliance items such as annual reports. See annual reports and franchise taxes.

Making it stick

• Put the close on the calendar as a recurring appointment.
• Use the same checklist each month and record completion dates.
• Assign an owner, and a backup.
• Keep notes about issues for the next month.
• If something repeatedly goes wrong (for example, a vendor's charges are always miscoded), fix the rule.

If you would like a review of your close process or help building a checklist for your entity type, AE Tax Advisors can assist, and a discovery call is a good first step.