Most small business bookkeeping is not wrong because the bookkeeper lacked skill. It is wrong because nobody defined what "done" means. Without a checklist, closing a month becomes a vibe — you stop when the obvious stuff is handled and the day runs out.
A checklist converts that into a binary. Either all twelve steps are ticked or the month is not closed. Here is ours.
Target: close by the 10th. Numbers you receive on the 10th can change what you do in the rest of the month. Numbers you receive on the 28th are history. The date is not administrative pedantry — it is the entire difference between reporting and management.
1. Confirm all transactions are in
Before reconciling anything, check that every source has actually delivered. Bank feeds break silently — a feed that stopped pulling on the 14th will let you reconcile a perfectly balanced, completely incomplete month. Check the last imported date on every connected account, and confirm any manual sources (petty cash, a director's personal card used for business, a rarely-used PayPal) have been entered.
2. Reconcile every bank and credit card account
Every account, to the statement closing balance, to the penny. "Nearly reconciled" is not a state that exists. If there is a difference, find it now — it will be a hundred times harder to trace in four months, and differences compound.
Watch specifically for: duplicated transactions from a feed reconnect, payments recorded twice because a manual entry met an imported one, and stale uncleared items sitting for months that are usually errors rather than genuine timing differences.
3. Reconcile merchant and payment processors
Stripe, PayPal, Shopify Payments, Square, Amazon. These are where small business books most commonly go quietly wrong, because the deposit that hits your bank is net — gross sales minus fees minus refunds minus chargebacks minus reserves.
Recording only the net deposit as income understates both your revenue and your costs. Your top line is wrong, your fee expense is invisible, and your margin analysis is fiction. Each processor needs its own clearing account, reconciled to the processor's own statement.
4. Check the cut-off
Cut-off means: did revenue and costs land in the month they belong to? An invoice raised on the 2nd of the following month for work completed on the 29th belongs in the earlier month. A supplier bill dated the 28th that arrives on the 5th belongs in the earlier month too.
Sloppy cut-off is why a business can appear to have a catastrophic month followed by an amazing one, when in reality both were ordinary. Nothing destroys the usefulness of monthly reporting faster.
5. Post accruals and prepayments
Costs incurred but not yet invoiced get accrued. Costs paid upfront covering future periods get spread. The classic examples are annual insurance, annual software subscriptions and rent paid quarterly in advance.
You do not need to do this for every £40 subscription — apply materiality. But a £12,000 annual insurance premium hitting one month as a single expense will make that month look like a disaster and the following eleven look better than they are.
6. Update the fixed asset register and post depreciation
Anything purchased this month that is an asset rather than an expense goes on the register, and depreciation is posted for everything on it. Assets disposed of or scrapped come off, with any gain or loss recognised.
This is one of the most commonly skipped steps in small business books, and it is why so many balance sheets show equipment purchased in 2019 still sitting at full cost.
7. Review accounts receivable
Print the aged debtor report and actually read it. Every invoice over 60 days needs a note explaining what is happening with it. Anything genuinely uncollectable should be provided for or written off rather than sitting on the balance sheet inflating your assets.
Also confirm the aged debtor total agrees to the receivables control account on the balance sheet. If they differ, something has been posted directly to the control account, and that is always worth investigating.
8. Review accounts payable
Same discipline in reverse. Aged creditors reviewed, total agreed to the control account, and — importantly — check for supplier invoices you know exist but have not yet been entered. Unrecorded liabilities are the most common way a month's profit gets overstated.
9. Reconcile payroll to the ledger
Gross wages, employer contributions and deductions from your payroll report must agree to what is posted in the accounts. Wage control and tax liability accounts should clear to the expected balance each month.
A payroll control account that never clears is a reliable sign that journals are being posted incorrectly — and that your wage cost, liabilities and net profit are all simultaneously wrong.
10. Review every balance sheet account
This is the step that separates a real close from a superficial one. Go down the balance sheet line by line and ask, for each: can I explain what this number is and prove it?
Balances that have not moved in six months, "miscellaneous" accounts, suspense accounts, director loan accounts nobody has looked at — these are where errors accumulate. The profit and loss gets attention because people care about profit. The balance sheet is where the actual problems live.
11. Compare to prior month and prior year
Run the P&L with comparative columns and scan for anything that moved more than you would expect. You are not looking for perfection — you are looking for surprises.
A cost category that doubled, a revenue line that halved, a gross margin that shifted three points. Sometimes it is a genuine business change worth knowing about. Very often it is a coding error you just caught before it reached the client. Both outcomes are valuable.
12. Review, report, then lock
Someone other than the person who did the work reviews the close. On our files that is always a qualified accountant. Then the reports go out with written commentary — what moved, why, and what to watch.
Finally, lock the period. Both QuickBooks Online and Xero support a lock date. Setting it means a closed month cannot be silently altered by a stray entry three weeks later. Reports you ran in March will still say the same thing in September.
An unlocked accounting period is not a closed period. It is just a period nobody has touched recently.
How long should this take?
For a small business with clean, current books, the full twelve steps take two to four hours. If it is taking you two days, the problem is almost never the close itself — it is that the daily bookkeeping underneath it is not being maintained, so month-end becomes month-of-work.
The fix is boring and reliable: live bank feeds, receipt capture on the phone so documents arrive on the day they happen, and a weekly fifteen-minute categorisation pass. Do that and month-end genuinely becomes a checklist rather than an ordeal.
Written by Pro Bookkeepers and reviewed by an ACCA-qualified accountant. General guidance only, not tax or accounting advice for your specific circumstances.