Managing your money as a UK micro-business: a practical guide

Most failed UK micro-businesses do not fail because of one big disaster. They fail because of small habits compounding — missing a VAT deadline, paying yourself unsustainable salary, letting one customer drift to 90 days. This piece is a tour of the routines that prevent the slow-burn version of running out of money.

Separate accounts from day one

Open a dedicated business current account in the company name as soon as Companies House gives you a number. HMRC will accept a personal account in theory, but it makes bookkeeping miserable and it makes accountants charge you more. Most UK challenger banks (Tide, Starling Business, Monzo Business, Mettle) open a business account in 24 hours with no monthly fee for a starter tier.

Build a one-month cash buffer before anything else

Aim to keep one month of total operating costs in a separate savings pot before drawing dividends. “One month” means rent, payroll, software, repayments, and the actual tax you owe — not the optimistic version. A buffer is what lets you say no to a bad customer and yes to an opportunity.

Get paid on time — without being unpleasant

Long invoice terms are a habit not a law. Default to 14 days, ask for it in writing on the order, and send a polite reminder the day after due. Studies by the Federation of Small Businesses suggest the average UK SME is owed over £8,000 in late payments at any given moment. You can claim statutory interest under the Late Payment of Commercial Debts (Interest) Act 1998 — 8% over the Bank of England base rate plus a fixed fee — but the bigger win is simply asking.

The four numbers to watch each month

• Cash in the bank — the only number that stops you panicking on payroll day.
• Gross margin — revenue minus cost of sales. If this is dropping you are pricing wrong or paying suppliers too much.
• Net profit — what is left after every cost. A loss is a signal, not a verdict.
• Debtors days — how long customers take to pay. If this drifts, your buffer drains even if the business looks healthy.

The tax dates that matter

Corporation tax — pay within 9 months and 1 day of your year-end. VAT — quarterly returns under Making Tax Digital. PAYE — monthly. Self-assessment for the director — 31 January. Diary every single one of those today.

Where to get free help

The Business Debtline runs a free advice line for small business owners (0800 197 6026). The Federation of Small Businesses publishes practical guides on cash flow, tax and disputes. The British Business Bank’s Finance Hub walks you through the funding options if borrowing is on the table.

If a payment to us is going to be hard, please tell us early. We can almost always work something out if we know in time.