Business Tax for Sole Traders: Every Tax You Pay in 2026/27 (With Worked £ Examples)

As a sole trader in the UK, your business tax in 2026/27 is Income Tax on your profit, National Insurance on your profit, and VAT only if your turnover crosses the threshold. You do not pay Corporation Tax — that is for limited companies only. This guide shows every tax, with worked pound examples.

What Counts as Business Tax for a Sole Trader?

First, an important distinction: HMRC taxes your profit, not your total sales. Profit is what is left after you deduct your allowable business expenses from your income. If you billed £40,000 in a year but spent £10,000 on genuine business costs, you are taxed on £30,000 — not £40,000.

That is why keeping records matters so much. Every allowable expense you forget is profit you pay tax on unnecessarily. Common allowable expenses include office costs, travel, stock and materials, advertising, professional fees, and a fair share of working-from-home costs. You can also use the £1,000 trading allowance instead of claiming expenses if your total trading income is £1,000 or less, or if claiming the allowance works out better for you.

Your main taxes as a sole trader are Income Tax and Class 4 National Insurance, both paid through your Self Assessment tax return. VAT is separate and only applies once your VAT-taxable turnover passes £90,000 in a rolling 12-month period.

Income Tax Rates for Sole Traders in 2026/27

Income Tax for 2026/27 (6 April 2026 to 5 April 2027) in England, Wales and Northern Ireland uses the standard Personal Allowance of £12,570. You pay nothing on the first £12,570 of income, then tax only on the slice inside each band — never the higher rate on your whole income.

If your adjusted net income goes above £100,000, your Personal Allowance shrinks by £1 for every £2 above that line, and it disappears entirely at £125,140. Scotland sets its own Income Tax bands, so Scottish sole traders should check the Scottish rates separately. The figures in this article follow the GOV.UK Income Tax rates page.

National Insurance: Class 4 and Class 2 Explained

National Insurance is the second bill, and it confuses more sole traders than Income Tax does. There are two classes that matter to you:

Class 4 National Insurance is the main one. For 2026/27 you pay 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270. It is calculated on the same profit figure as your Income Tax and paid with the same tax bill — but unlike Income Tax, it does not build your State Pension.

Class 2 National Insurance used to be a compulsory weekly payment, but since April 2024 it works differently. If your profits are £7,105 or more, HMRC treats your Class 2 contributions as paid automatically, so you keep building qualifying years towards your State Pension at no extra cost. If your profits are below £7,105, you can choose to pay voluntary Class 2 at £3.65 a week (£189.80 a year) to protect your National Insurance record.

Worked Examples: What You Actually Pay

Here is how the two bills combine. Both examples assume a sole trader in England with no other income and the full £12,570 Personal Allowance.

Example 1 — Sarah, a freelance graphic designer with £30,000 profit. Her taxable slice is £30,000 minus £12,570, which is £17,430. Income Tax at 20% is £3,486. Class 4 National Insurance at 6% is £1,046. Her total bill is £4,532 — about 15% of her profit.

Example 2 — A sole trader with £50,000 profit. The taxable slice is £50,000 minus £12,570, which is £37,430. Income Tax at 20% is £7,486. Class 4 at 6% is £2,246. The total bill is £9,732 — just under 20% of profit. Notice that in both cases the bill is far lower than the headline 20% plus 6%, because the first £12,570 is tax-free.

A practical rule of thumb: set aside 25% to 30% of every payment you receive into a separate account. That covers your tax and National Insurance with a cushion for a quiet month or a payment on account, and whatever is left over after your bill is a welcome bonus.

VAT: When Does a Sole Trader Have to Register?

You must register for VAT if your VAT-taxable turnover passes £90,000 in any rolling 12-month period — not just in a single tax year. Once registered, you charge VAT on your sales, reclaim VAT on your business purchases, and file VAT returns, usually every three months. Many sole traders stay below the threshold for years and never need to register, while fast-growing ones can cross it mid-year without noticing, so keep an eye on your rolling 12-month turnover, not just your tax-year total.

Deadlines and Payments on Account

The Self Assessment calendar catches out first-time sole traders more than the rates do. Register for Self Assessment by 5 October after the end of the tax year in which you started trading. File your online return and pay any balancing payment by 31 January after the tax year ends. If your bill is over £1,000, you will usually also make payments on account — advance payments towards next year’s bill, due on 31 January and 31 July. Miss the 31 January deadline and penalties and interest start building, so diary these dates the moment you start trading.

When Your Business Tax Changes

Three changes can reshape your tax bill. First, taking on an employee adds PAYE and employer National Insurance duties. Second, crossing the VAT threshold adds VAT returns to your admin. Third, turning your sole trader business into a limited company swaps Income Tax and Class 4 for Corporation Tax, salary and dividend rules — a move worth weighing up once profits grow, because the most tax-efficient structure depends on how much profit you keep in the business versus take out.

Frequently Asked Questions

Do sole traders pay Corporation Tax?

No. Corporation Tax is paid by limited companies on their profits. As a sole trader, you and your business are the same person for tax purposes, so you pay Income Tax and National Insurance on your business profit instead.

How much should a sole trader set aside for tax?

As a rough guide, 25% to 30% of each payment covers Income Tax and Class 4 National Insurance for most sole traders earning up to £50,000 profit, with room for payments on account. Adjust the percentage up if your profit is higher or you have other income using up your Personal Allowance.

When do sole traders pay their tax bill?

Your online Self Assessment return and balancing payment are due by 31 January after the tax year ends. If you owe more than £1,000, you normally also pay payments on account on 31 January and 31 July.

Do I need to register for VAT as a sole trader?

Only if your VAT-taxable turnover exceeds £90,000 in a rolling 12-month period. Below that, registration is optional — some sole traders register voluntarily to reclaim VAT on purchases, but that also means charging VAT to customers and filing regular returns.

Conclusion

Business tax for sole traders is simpler than it first looks: Income Tax on your profit above £12,570, Class 4 National Insurance at 6% up to £50,270 and 2% above, and VAT only past £90,000 of turnover. Work out your profit carefully, claim every allowable expense, set money aside with every payment, and never miss the 31 January deadline. Do those four things and your tax bill holds no surprises — leaving you free to spend your time growing the business, not worrying about HMRC.