Clean books aren't produced in April — they're produced by a boring, repeatable monthly routine. This is the 10-step checklist professional bookkeepers actually follow. Do it (or have it done) every month and tax season becomes a non-event.
The 10-step monthly close
1. Get every transaction into the books
Import or verify all bank, credit-card and payment-processor activity for the month. Missing accounts are where messes begin — include the PayPal account everyone forgets.
2. Categorise everything properly
No transaction left in "Uncategorized." If you're unsure where something goes, decide once, write the rule down, and apply it consistently forever.
3. Reconcile every account
Match the books against every bank and card statement until they agree to the penny. This is the single non-negotiable step — reconciliation is what makes the rest of the report trustworthy.
4. Review accounts receivable
Who owes you money, and for how long? Chase anything over 30 days now — collection odds fall off a cliff as invoices age. Apply received payments to their invoices (not as new deposits).
5. Review accounts payable
What do you owe, and when? Schedule payments to capture early-payment discounts and avoid late fees. (New to AP/AR? Our plain-English explainer covers both.)
6. Check payroll and contractor payments
Confirm payroll posted correctly and contractor payments are tagged — your future 1099 filings depend on this running total being right.
7. Review the income statement
Read it line by line against last month. Anything surprising — revenue dip, expense spike, a category that doubled — gets investigated now, while the memory is fresh, not in eleven months.
8. Review the balance sheet
Do the balances make sense? No mysterious negatives, no stale loans, undeposited funds near zero? A sensible balance sheet is the health certificate of your books.
9. Set aside tax money
Move a fixed percentage of profit (typically 25–30% for pass-through owners) to a separate tax account. Quarterly estimates stop hurting when the money is already parked.
10. Close and file
Lock the month in your software so nothing changes retroactively, and save the statements. Done before the 15th of the following month, every month.
The three numbers to actually read
| Number | Question it answers | Warning sign |
|---|---|---|
| Gross profit margin | Is the core business healthy? | Falling margin while revenue grows |
| Operating cash flow | Is real money coming in? | Profit on paper but shrinking bank balance |
| A/R over 30 days | Are customers actually paying? | Aging receivables creeping upward |
Time budget: a typical small business needs 3–8 hours a month to do this properly. If that's not happening — and for most owners it isn't — that's exactly the job a monthly bookkeeping service exists to own. Falling behind instead? Start with the catch-up guide.
Why the routine beats the heroic catch-up
Monthly closes catch duplicate charges while they're refundable, spot fraudulent transactions while the bank will still reverse them, keep deductions documented while receipts still exist, and give you financials that are always ready for a loan application, an investor, or a tax filing. The alternative — reconstructing a year each spring — costs more, recovers less, and tells you about problems a year too late.
Frequently Asked Questions
What should be done in monthly bookkeeping?
Each month: record and categorise all transactions, reconcile every bank and credit-card account, review accounts receivable and payable, verify payroll and contractor payments, review the income statement and balance sheet, set aside tax money, then close the month and save the statements.
How long does monthly bookkeeping take for a small business?
Typically 3–8 hours per month for a small business with moderate transaction volume, if done consistently. Skipping months makes each one slower — reconstructing old months takes two to three times longer than closing a current one.
What is a monthly close in bookkeeping?
The monthly close is the process of finalising the books for a month: all transactions recorded, all accounts reconciled, statements reviewed, and the period locked so numbers can't change retroactively. It's what keeps financial reports reliable throughout the year.
This article is general information, not personalised tax, legal or accounting advice. Rules and thresholds change — confirm current-year figures with the IRS or a qualified professional before acting. Ask Accounts Buddy if you'd like help applying any of this to your business.