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Going self-employed usually starts with the work itself: the clients, the craft, the first invoice. Bookkeeping arrives later, often with a sigh. But a sole trader's records do three jobs at once. They keep you right with HMRC, they show whether the business is genuinely making money, and they strip the panic out of the January tax return. None of it is difficult. It just has to be consistent.
When you start trading, you need to tell HMRC and register for Self Assessment. The process is quick online, and you will be issued a Unique Taxpayer Reference. If you have not filed a return before, you generally need to register by 5 October following the end of the tax year in which you started trading. The tax year runs from 6 April to 5 April, so that deadline arrives sooner than most people expect.
From then on, three obligations repeat every year:
On that last point, HMRC expects records to be kept for at least five years after the 31 January filing deadline for the tax year in question. That means receipts, invoices, bank statements and contracts — anything showing money coming in and going out. If you take on employees, register for VAT, or your income grows, further rules apply, including Making Tax Digital for Income Tax, which is being introduced in stages. Check the current position on GOV.UK rather than relying on what a friend told you two years ago.
A single account for everything is the biggest cause of messy books. HMRC does not insist that a sole trader has a separate business bank account, but you should have one anyway — or at the very least a second current account used only for trading.
Then build two habits. First, run all business income and spending through that account. Second, pay yourself deliberately: transfer money to your personal account as drawings, and label it as such. Drawings are not a business expense and do not reduce your taxable profit, so mixing them up muddles both your bookkeeping and your tax position.
If you cannot tell, three months later, whether a £42 card payment was stock or a birthday present, the records have already failed.
Cash is the other trap. If a customer pays in notes, bank it. A drawer of loose cash proves nothing to anyone.
There is no prize for adopting complicated software in your first month. What matters is that your system can produce three numbers at any moment: total income, total allowable expenses, and profit.
Most new sole traders pick one of these:
You will also meet the choice between cash basis and traditional accounting. Cash basis — recording income when it arrives and expenses when you pay them — is now the default for most sole traders, though traditional accounting may suit you better if you hold significant stock or work on long contracts. If your circumstances are unusual, take advice before deciding.
Whatever tool you use, every entry needs the same basic information. Capture it at the point of sale or purchase, not at the end of the quarter.
Then settle on a rhythm. Fifteen minutes every Friday beats a lost weekend every quarter. Photograph paper receipts as you receive them and file them by month; till roll ink fades, and so does your memory of what it was for. Number your invoices in sequence and keep copies of the ones you send, not just the ones you receive.
Allowable expenses are costs that are wholly and exclusively for your business. In practice that covers stock and materials, office supplies, software subscriptions, insurance, professional fees, advertising, business travel, and the business share of your phone and broadband.
Some things do not count. You cannot claim personal spending that happens to pass through the business account, your own drawings, fines and penalties, ordinary clothing, or client entertaining. If something serves both home and business — a phone, a car, a spare room — claim a fair business proportion and be ready to explain how you reached it. HMRC's simplified expenses schemes, including mileage rates and a flat rate for working from home, can save a great deal of arithmetic.
Whichever route you take, keep the evidence. A claim without a receipt is a claim you may have to give up.
Tax on self-employed profit is not deducted at source. That catches out almost every new sole trader in their first profitable year, particularly as HMRC may also ask for payments on account towards the following year's bill.
A simple discipline: every time a client pays, move a set percentage into a separate savings account and leave it there. Twenty to thirty per cent is a common starting point, but your own rate depends on your profit and circumstances, so an accountant can give you a figure that fits.
Then diarise the dates: 31 January for filing and payment, 31 July for the second payment on account where one applies, and 5 October for registering if you are new. Set reminders three weeks early. HMRC deadlines are not flexible, and penalties start immediately.
Strip it back and the whole thing looks manageable.
Do that and your records will be accurate, dull and ready when you need them, which is exactly what good bookkeeping should be. If your affairs are more involved — property income, VAT, employees, or a business growing quickly — bring in an accountant early. It usually costs less than clearing up the mess afterwards.
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