How to keep clean books and close every month.

Bookkeeping is recording every transaction correctly. Management accounts are the monthly reports you build from those records: a P&L, a balance sheet and a cash summary, plus a few key metrics. Statutory accounts, filed once a year with Companies House and HMRC, are a legal requirement. Management accounts are for you, and they are where good decisions come from.

When the books are months behind, tech founders make hiring and pricing decisions on guesses, VAT returns become stressful, year-end costs more and any investor due diligence starts on the back foot.

Set up the foundations

• Use cloud accounting software connected to your bank feeds. VAT-registered businesses must keep digital records and file VAT returns using compatible software under Making Tax Digital, so it makes sense to start digital from day one.
• Keep a separate business bank account and never mix personal spending through it.
• Agree a simple chart of accounts with your accountant. Split revenue by type (subscriptions, services, one-off) and split costs so you can see cost of sales separately from overheads. That split is what lets you calculate gross margin.
• Capture receipts at source with a receipt app or by forwarding them to the accounting software.
• Invoice from the accounting system so receivables are always up to date.

A monthly close checklist

Aim to close each month within ten working days of month end. A rule of thumb: a faster close matters less than a consistent one.

1. Reconcile every bank and card account to the statement balance.
2. Chase missing receipts and code every unexplained transaction.
3. Review receivables: who owes what, and how overdue.
4. Review payables: bills received but not yet paid.
5. Post accruals and prepayments. Record costs that belong to this month even if invoiced later, and spread annual payments, such as insurance or annual software, over the months they cover.
6. Recognise revenue correctly. For annual subscriptions paid up front, recognise one twelfth each month and hold the rest as deferred income.
7. Reconcile payroll, PAYE, pension and VAT control accounts so balances owed to HMRC and the pension provider are right.
8. Produce the pack: P&L against budget, balance sheet, cash summary and KPIs.
9. Write one page of commentary: what changed, why, and what you will do about it.

What a good management pack contains

Keep it short. One page of headline numbers (revenue, gross margin, operating costs, net burn, cash, runway), one page of P&L versus budget with variances, a balance sheet and a few metrics specific to your model, such as MRR, churn and customer count. The same pack can feed your monthly investor update.

Worked example

Quillstack is a fictional Manchester tech startup selling document automation to law firms. Its books were updated only at year end, by its accountant. When it started talking to an angel investor, it could not say what its gross margin was, because hosting, a third-party AI service and implementation contractors were all coded to “general expenses”. Its revenue also looked lumpy because annual prepayments were recognised in the month they were paid.

The team spent two weekends cleaning up the previous six months with its accountant, introduced a cost of sales category and deferred income, and adopted a ten-day close. Within three months it could show a stable gross margin and smooth monthly revenue, and it discovered that one implementation-heavy customer was barely covering its costs.

Common mistakes

• Leaving bookkeeping until the VAT return or year end is due.
• Coding everything to a handful of vague categories.
• Recognising annual prepayments as revenue in a single month.
• Mixing personal and business spending.
• Producing management accounts nobody reads, because there is no commentary or review meeting.

What to measure

• Days to close after month end.
• Unreconciled items at close (target: none).
• Variance to budget on revenue and major cost lines.
• Debtor days and overdue receivables.

For statutory deadlines, see filing company accounts and tax returns on GOV.UK.