Bookkeeping for sole traders: the complete UK guide

Being a sole trader is the simplest way to run a business in the UK. You are self-employed, you keep the profits, and you register with HMRC rather than Companies House. But simple does not mean effortless. Your profit determines your tax bill, and your profit depends on records that are complete, accurate and kept up to date. This guide covers the whole picture for sole traders: what to record, what you can claim, how the rules work, which tools to use and how to build a routine that takes hours, not days.

What bookkeeping means for a sole trader

Bookkeeping is the recording of every financial transaction in your business: money coming in, money going out, and the paperwork that proves each one. Unlike a limited company, you do not file statutory accounts, but you do file a Self Assessment tax return, and the figures on it must come from proper records. From April 2026, many sole traders also send quarterly updates under Making Tax Digital, which makes current records more important. Read our Making Tax Digital guide.

What you need to record

Income. Every sale, whether it is paid by bank transfer, card, cash or through a platform. Record the gross amount and the platform's fees separately.

Expenses. Every cost you intend to claim, with a receipt or invoice.

Money in and out of the business. If you pay yourself from the business account, these are drawings. They are not an expense, and they do not reduce your profit.

Assets. Equipment and vehicles you buy for the business.

Mileage and home use. Business journeys and, if you work from home, your home-working hours or costs.

What you can claim as an expense

An expense is allowable if it is incurred wholly and exclusively for business purposes. Common allowable costs include:

• Stock and materials you buy to resell or use
• Premises costs such as rent, utilities and business rates for a workshop or office
• Travel on business, including fuel, public transport and parking, but not normal commuting
• Insurance such as public liability and professional indemnity
• Professional fees including bookkeeping, accountancy and legal fees
• Marketing and advertising, including website costs
• Software and subscriptions used in the business
• Phone and internet, apportioned if you also use them privately
• Training that maintains or updates skills you already use in the business
• Bank charges and interest on business accounts and loans

Some costs are not allowable, including fines, personal clothing, client entertainment and most everyday meals. If a cost has both a business and a private element, you can claim only the business share, and you should keep a note of how you worked it out. See our guide to categorising business expenses for more detail.

Simplified expenses

Sole traders can use flat rates instead of tracking some costs. The main ones are mileage (45p for the first 10,000 business miles and 25p after in a car or van), a monthly flat rate for use of home and, for those who live in their business premises, a flat rate for private use. Our mileage calculator works out the claim. You choose one method for each vehicle, so decide at the start whether simplified mileage or actual costs with capital allowances suits you better.

Cash basis versus accruals

Most sole traders now use the cash basis by default. Under the cash basis you record income when you receive it and expenses when you pay them. It is simple and matches your bank account. Under traditional accounting you record income when you invoice and expenses when you are billed, regardless of payment date, which gives a more accurate picture for businesses with significant credit or stock. You can opt out of the cash basis if accruals suits you better, for example if you have large amounts outstanding at year-end. Read our guide to cash basis versus accruals.

The key dates

Date	What happens
5 April	Tax year ends
5 October	Register for Self Assessment if new to it
31 October	Paper return deadline
31 January	Online return deadline and tax due, plus first payment on account
31 July	Second payment on account

If your Self Assessment bill is over £1,000 and less than 80% of your tax is collected at source, you usually pay on account: two instalments each of half of the previous year's bill, plus a balancing payment. Keep money aside every month so you are not surprised. Our sole trader tax calculator estimates your bill.

Tax on your profit

For 2026/27 in England, Wales and Northern Ireland, the first £12,570 of income is covered by the personal allowance. Above that, income tax is 20% up to £50,270 and 40% above. On top of that, you pay Class 4 National Insurance at 6% on profits between £12,570 and £50,270 and 2% above. Scottish taxpayers pay different income tax rates. If your income from self-employment and property exceeds £50,000, Making Tax Digital applies from April 2026.

VAT for sole traders

You must register for VAT once your taxable turnover passes £90,000 in any rolling 12 months. You can register earlier voluntarily, which can help if your customers are VAT-registered businesses and you buy a lot of VAT-bearing goods. Once registered, you must use Making Tax Digital for VAT. Our VAT guide explains the rules and the Flat Rate Scheme.

Tools for sole trader bookkeeping

You have three realistic options.

Spreadsheets. Free and flexible, but error-prone and not compatible with Making Tax Digital without bridging software.

Simple accounting software. Products aimed at sole traders handle invoices, expenses, bank feeds and Making Tax Digital submissions for a modest monthly fee. Xero, QuickBooks and FreeAgent all have suitable plans. See our guide to choosing accounting software.

A bookkeeper. If your time is better spent earning, outsourcing is often cheaper than it looks. At £15 an hour, a sole trader with 50 transactions a month typically pays around £45. See bookkeeping for sole traders.

A monthly routine that takes two hours

1. Connect your bank feed and categorise new transactions.
2. Match receipts to bank lines and chase anything missing.
3. Raise and chase invoices. Follow up anything overdue.
4. Log mileage and home-working hours.
5. Review your profit for the month and set aside tax money.
6. Note upcoming deadlines.

Use our free monthly checklist to make sure nothing is missed.

Common sole trader bookkeeping mistakes

• Mixing personal and business spending in one account
• Forgetting to record cash income
• Claiming personal costs as business expenses
• Not keeping receipts
• Leaving everything until January
• Treating drawings as expenses
• Ignoring payments on account

When to get help

If bookkeeping takes more than a few hours a month, if you are behind, or if you are nearing the VAT or Making Tax Digital thresholds, help pays for itself. Our monthly bookkeeping service handles the routine; catch-up bookkeeping deals with backlogs.

Frequently asked questions

Do sole traders need a separate business bank account?

It is not a legal requirement, but it is strongly recommended. It keeps records clean and makes reconciliation far faster.

How long should a sole trader keep records?

At least 5 years after the 31 January deadline for the relevant tax return.

Can I claim for working from home?

Yes. You can use the simplified flat rates based on hours worked from home, or a reasonable proportion of actual household costs.

Is it worth getting a bookkeeper as a sole trader?

If you value your time and your records are time-consuming or error-prone, yes. Use our instant quote to see the monthly cost.

What happens if I make a mistake on my return?

You can amend a Self Assessment return within 12 months of the filing deadline. Honest mistakes are normally corrected without penalty.