Month-End Close Checklist for Small Business

Most small-business closes fail on sequence, not effort. A dated five-day checklist, the cutoff rules behind the usual errors, and the IRS threshold that decides your method.

Why the sequence is the whole job

Ask ten small-business owners what closes the books and most will say “reconciling the bank.” That is one step, and not the first one. Reconciling cash proves your cash balance is right. It says nothing about whether last month’s revenue landed in last month, whether the insurance you prepaid covers the next twelve months, or whether the loan payment was split correctly between interest and principal.

Order also prevents rework: accrue an unbilled invoice before confirming cutoff and you may end up reversing the accrual, re-reconciling payables and re-running the statements. Each step below depends only on steps already finished.

Before day one: the cutoff rule

Cutoff is the single decision that governs everything downstream: which month does this transaction belong to? Not when you paid it, and not when you entered it — when the economic event happened.

• Revenue belongs to the month you delivered the goods or performed the service, not the month the customer paid.
• Expenses belong to the month you received the benefit. A utility bill arriving on the 8th for service through the 31st belongs to the prior month.
• Inventory belongs to whoever holds title at the cutoff moment — goods shipped FOB shipping point on the 31st are yours, even on a truck.

Pick a cutoff date and hold it. The common failure is a soft cutoff: someone books a late invoice into the closed month on day six because “it’s only a small one.” That changes statements already issued.

Day 1 — Cutoff and cash

1. Confirm that all bank and credit-card feeds have imported through the last calendar day of the month. Feeds routinely lag two to three days; closing on stale data is the most common cause of a “mystery” variance.
2. Categorise every uncategorised transaction. Nothing should be sitting in an Ask My Accountant or suspense account when you move to day two.
3. Reconcile every bank account and every credit card to the statement — not to the feed balance. The statement is the third-party evidence; the feed is a convenience.
4. Investigate cheques outstanding over 90 days and stale deposits in transit. A deposit that has not cleared in a week is usually a duplicate or a keying error, not a timing difference.

If cash does not reconcile, stop. Every later step reads from balances that cash touches. Our walkthrough of bank reconciliation in QuickBooks covers the mechanics, including a wrong beginning balance.

Day 2 — Subledgers and the rest of the balance sheet

The balance sheet is where errors hide, because an income-statement error is usually visible and a balance-sheet error usually is not. Work down it account by account:

• Accounts receivable: the A/R ageing total must equal the A/R control account in the general ledger. If it does not, someone posted a journal entry straight to A/R instead of raising an invoice or credit memo.
• Accounts payable: same test against the A/P ageing, then scan for bills entered twice. Duplicate vendor invoices are the most common small-business A/P error and overstate both expense and liability.
• Undeposited funds and clearing accounts: these should sit at or near zero. A growing balance means payments were recorded but never matched to a deposit, which double-counts revenue.
• Payroll liabilities: the balance should equal what you owe and have not yet remitted. An account that only grows means payments are being coded to expense instead of clearing the liability.
• Sales tax payable: tie to the filing, not to a plug.
• Loans: tie to the lender statement and split each payment between principal and interest. Coding the whole payment to expense is a small error monthly and a large one annually.

Anything that will not tie gets written down with a dollar amount and a name attached, not carried forward as “look into this.”

Day 3 — Accruals, deferrals and depreciation

This separates a close from a bookkeeping tidy-up, and most small businesses skip it.

• Accrued expenses: costs incurred but not yet billed — the contractor who has not invoiced, the utility bill that arrives mid-month, professional fees for work already done. Reverse the accrual in the following month so the real invoice does not double-count.
• Prepaid expenses: amounts paid up front that cover future months. Annual insurance, software subscriptions, rent paid in advance. Move one month out of prepaid and into expense.
• Deferred revenue: money collected before you delivered. Retainers, deposits, annual plans. Recognise only the portion you earned this month; the rest stays a liability.
• Depreciation and amortisation: post the monthly charge rather than a single year-end entry. A December-only entry makes eleven months look profitable and one month look catastrophic.

On the cash method these entries are not required for tax, but they are what make monthly statements comparable. If they feel like too much to carry every month, that is the signal to look at outsourced bookkeeping rather than to drop the step.

Day 4 — Review, before anyone sees the numbers

Do not send statements straight out of the software. Run these four checks first:

1. Trial balance, month over month. Put this month beside last month and look at every account that moved more than 10% or more than a threshold you set in dollars. You are looking for accounts that should not have moved at all.
2. Negative balances. A negative asset or a negative liability is nearly always a posting error — a payment applied to the wrong customer, a bill paid twice.
3. The blank-account scan. An expense account with activity every month that is suddenly empty means the coding changed, not the spending.
4. Gross margin. If margin moved more than a point or two without a known cause, something is miscategorised between cost of goods sold and operating expense. This is the single most useful check on the list.

Day 5 — Lock the period and write the note

Set the closing date in your accounting software and password-protect it. This is what makes everything before it durable: without a lock, one backdated entry rewrites a month you already reported.

Then write three or four sentences on what happened — revenue direction and why, anything unusual in expenses, anything unresolved carrying into next month. In a year that note will be worth more than the statements, and it takes five minutes while the month is fresh.

Cash or accrual: the threshold that decides it

Whether your close needs full accrual treatment for tax purposes turns on a specific, annually-adjusted number. Under IRC §448(c), a corporation or partnership meets the gross receipts test — and is generally not barred from the cash method — if average annual gross receipts for the three prior tax years do not exceed $32,000,000 for tax years beginning in 2026. That figure comes from the IRS inflation adjustments in Rev. Proc. 2025-32; it was $31,000,000 for 2025 and $30,000,000 for 2024.

Two cautions. The number moves every year, so check the current revenue procedure rather than a blog post — including this one. And being permitted to use the cash method is not the same as it being the right choice: cash-basis statements bunch expenses into the month you paid them, making margin trends unreadable. Plenty of businesses far below the threshold close on accrual internally and file on cash.

What a close looks like when it goes wrong

Three patterns account for most of them. The close that never ends — still open on day fifteen — is a bookkeeping problem wearing a close costume; the fix is categorising weekly, not closing harder. The close that only reconciles cash produces statements that look finished and are wrong on the balance sheet. And the close nobody reviews surfaces its errors at tax time, when correcting them is expensive.

If your books are far enough behind that a monthly rhythm is not yet realistic, start with catch-up bookkeeping to get current, then adopt the close. Running a close on top of six open months does not work.