Before You Start: Set a Cut-Off and Stick to It

Closing the books is not a single task — it is a short, deliberate project. Pick your year-end date first, whether that is 31 March, 5 April for the self-employed, or whichever date your limited company uses. Then freeze it. Nothing after that date belongs in this year's figures, no matter how tempting it is to sneak in a late invoice because the client finally paid.

Before touching anything, take a backup of your accounting file and export your bank statements as PDFs. Give yourself a realistic window — most small businesses need two to three hours for a tidy set of books, and considerably longer for the first year. Work through it in one or two sittings rather than chipping away at it for a fortnight.

Reconcile Every Account You Can

Reconciliation means proving that what your software says matches what actually happened. Start with the bank and work outwards.

• Bank and credit card accounts — every statement line should be ticked off against a transaction. Chasing a tenner in December is far easier than hunting for it in June.
• Payment platforms — if you take card payments or use online marketplaces, reconcile those balances too. Fees and refunds are the usual culprits.
• Loan and finance agreements — agree the closing balance to the lender's statement, and split each repayment correctly between interest and capital.
• VAT control account — the balance should match your last submitted return plus any amounts accrued since. If it does not, find out why now.
• Payroll control account — net wages, PAYE, national insurance and pension contributions should all clear out month by month.

An unreconciled account is a loose thread. Pull it now, while the paperwork is still on your desk.

Post Your Year-End Adjustments

Adjustments move income and costs into the period they genuinely belong to. Your software will not do this for you unless you tell it to.

• Accruals — costs you have incurred but not yet been invoiced for. Accountancy fees, utilities, and that last supplier delivery before the cut-off.
• Prepayments — insurance, software subscriptions and rent paid in advance, where part of the cost belongs to next year.
• Depreciation — apply your usual policy to equipment, vehicles and fixtures. Consistency matters more than cleverness.
• Stock — if you hold inventory, count it properly at the year-end date and value it at the lower of cost and net realisable value.
• Bad debt provision — if a customer has gone quiet for months, make a judgement and write down what you realistically will not collect.
• Director's loan account — check the balance. If the company owes you money, record it. If you owe the company, that has tax consequences worth addressing before the return is filed.

Keep a note of each adjustment and the reason for it. Future you — and your accountant — will thank you.

Review Debtors and Creditors Properly

Pull an aged debtors report and go through it line by line. Anything over 90 days needs a decision: chase it, agree a payment plan, or write it off. Don't leave stale invoices sitting on the ledger year after year looking like money you are about to receive.

Do the same with creditors. Check that you have recorded every bill you have received, and that nothing has been paid twice. Old credit balances from overpayments distort your profit figure and make your margins look better than they are. Clear them, refund them, or allocate them correctly.

This is also the moment to send statements to anyone who owes you. A year-end statement is a polite, legitimate reason to nudge a slow payer.

Check Your Tax Position Before You File

With clean figures in front of you, make a realistic estimate of the tax due. For a limited company that means corporation tax, plus any VAT and PAYE outstanding. For a sole trader, it is income tax and Class 4 national insurance through self assessment.

Set the money aside in a separate account. If cash is tight, this is the point to talk to your accountant about payment plans or timing — not in the week the deadline lands. Remember the filing dates: company accounts are usually due at Companies House nine months after the year end, and the corporation tax return twelve months after the end of the accounting period.

Archive the Records and Roll Forward

Once the figures are agreed, lock the period in your software so nobody can post into it by accident. Then archive the supporting documents — bank statements, invoices, expense receipts, payroll reports and your adjustment notes — in one clearly labelled folder, physical or digital. Companies must generally keep accounting records for six years from the end of the financial year, and longer if there are outstanding tax enquiries.

Finally, set your opening balances for the new year and check they tie back to the closing ones. If you use the same file, your software should roll forward automatically, but verify the debtors, creditors and bank balances before you start invoicing again.

Do this once a year, calmly, and every other month of the year becomes noticeably easier. Your books stay honest, your accountant asks fewer awkward questions, and you always know roughly where you stand.