Most small business owners meet their books in two bursts: a scramble before a VAT deadline and a bigger one at the year end. Between them the numbers drift, receipts go missing and a mistake made in February is still sitting there in December, much harder to trace. A short routine on the same day each month stops that, and it takes about an hour once the habit settles.
Why monthly
➠ Errors are cheapest to fix while you still remember the
transaction.
➠ VAT and payroll declarations are built on the same data, so
clean months make clean returns.
➠ You see problems with cash and margins in time to react.
➠ Your accountant spends less time untangling things and
charges accordingly.
The routine
1.Bank reconciliation, ten minutes. Match every bank transaction to an invoice, a receipt or a known category. Put anything you cannot explain on an exceptions list instead of guessing.
2.Sales, ten minutes. Check that every job delivered this month has been invoiced, that credit notes are recorded and that nothing was invoiced twice.
3.Purchases and expenses, ten minutes. Make sure every supplier invoice and receipt is captured and attached, and that expense claims are in. Chase what is missing now, while suppliers still remember.
4.Money owed to you, ten minutes. Review unpaid invoices by age, send reminders for anything past due and flag disputes. This is where late payment penalties come from, so apply your rules consistently.
5.Money you owe and what is coming, ten minutes. List what falls due next month, including VAT, payroll contributions, loan repayments, insurance and tax instalments, and check that the cash is there.
6.Five numbers and three lines, ten minutes. Record revenue, gross margin, cash in the bank, overdue invoices and committed payments for next month. Write three lines on what changed and why. Send the pack to your accountant or your business partners.
Keep it light
➠ Pick a fixed day, such as the third working day of the
month, and put it in the calendar.
➠ Use the same checklist every time. A routine you improvise
is a routine you skip.
➠ Lock the month once it is closed, so figures do not change
underneath you.
➠ Keep personal spending out of the business account. Mixed
accounts multiply the time this takes.
➠ Note unusual items in a sentence at the time. Memory fades
faster than you expect.
What a good month-end gives you
After three or four cycles you have a series of comparable months, which makes patterns visible: margins slipping, a customer paying a little later each time, a cost creeping up. The annual accounts show you the same things, but only months after they stopped being easy to fix.
French specifics
VAT and payroll declarations have fixed dates that depend on your regime and your size, so build them into the checklist. Since 1 September 2026 French businesses must also be able to receive structured electronic invoices, with the obligation to issue them following in phases, so check that incoming invoices reach the platform you use and are captured as part of step three.
Where tools help
The routine is quick when bank, invoices and accounts sit in one place and slow when they do not. Mirage Cloud connects to Qonto and Pennylane and includes a finance agent scoped to cash position, margins and budgets, which suits steps one, four and six. Connected tools save time on collection, not on judgement. You still decide what an odd transaction is.
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