Tax on £100,000 self-employed

Quick answer

If you're self-employed with a profit of £100,000, your total tax bill for 2026/27 is £30,878 — leaving £69,122 after Income Tax and National Insurance.

Reviewed by TaxFly Editorial Team How we calculate

Total tax & NI

£30,878

you keep £69,122 (69.1%)

Add expenses & payments on account

Profit: £100,000
Income Tax: − £27,432
Class 4 NI: − £3,257
Class 2 NI: − £190
After tax: £69,122

How much tax on £100,000 self-employed?

On a self-employment profit of £100,000, you pay £27,432 Income Tax, £3,257 Class 4 National Insurance and £190 Class 2 NI, a total of £30,878 for 2026/27. That leaves you with £69,122 — 69.1% of your profit.

Profit means your income after allowable business expenses. These figures assume no other income and the standard Personal Allowance — set those on the self-employed tax calculator.

How self-employed tax is worked out

You get a £12,570 tax-free Personal Allowance, then Income Tax on the rest. National Insurance is separate: Class 4 at 6% on profit between £12,570 and £50,270 (2% above), plus a flat Class 2 charge once profit passes the small-profits threshold. Remember to set aside money for payments on account — HMRC asks for next year's tax in advance.

Other profit levels

Tax on £20,000 Tax on £30,000 Tax on £40,000 Tax on £50,000 Tax on £60,000

Frequently asked questions

About £30,878 in total for 2026/27 — £27,432 Income Tax plus £3,446 National Insurance — leaving £69,122.

Yes — it includes Class 4 NI (£3,257) and Class 2 NI (£190) as well as Income Tax.

On profit — your income after allowable business expenses. Deducting more expenses lowers the tax.