Answers · UK 2025/26

How much tax and National Insurance do I pay on £155,000 self-employed profit?

On £155,000 of self-employed taxable profit in 2026/27, you pay £55,953.00 Income Tax and £4,356.60 Class 4 National Insurance, keeping £94,690.40 after tax and NI.

Last updated: 3 July 2026Last reviewed: 3 July 2026How we verify

Full answer

For a self-employed sole trader with £155,000 of taxable profit in 2026/27, the Personal Allowance is fully withdrawn because profit is well above the £125,140 taper ceiling, so the entire £155,000 is taxable. The first £37,700 is taxed at 20% (£7,540), the next £87,440 (up to £125,140) at 40% (£34,976), and the remaining £29,860 above £125,140 at the 45% additional rate (£13,437.00), giving total Income Tax of £55,953.00. Class 4 National Insurance is charged at 6% on profit between £12,570 and £50,270 (£2,262), plus 2% on the £104,730 above £50,270 (£2,094.60), giving £4,356.60. Total deductions of £60,309.60 leave £94,690.40 after tax and National Insurance -- an overall effective tax and NI rate of just over 38.91%. Self Assessment Payments on Account at this profit level are substantial, typically each equal to half of the total prior year's tax and Class 4 National Insurance liability, so many self-employed people at this level set aside 40-45% of monthly income in a separate account to avoid a cash-flow shock each January and July. At profits this high, many sole traders review whether incorporating as a limited company would reduce the combined tax and NI bill, since Corporation Tax followed by dividend tax can sometimes work out lower than Income Tax plus Class 4 NI, depending on how much profit is drawn out each year versus retained.