Answers · UK 2025/26

How much tax and National Insurance do I pay on £105,000 self-employed profit?

On £105,000 of self-employed taxable profit in 2026/27, you pay £30,432 Income Tax and £3,356.60 Class 4 National Insurance, keeping £71,211.40 after tax and NI. Your Personal Allowance is cut to £10,070 because profit is £5,000 above the £100,000 taper threshold.

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

Full answer

For a self-employed sole trader with £105,000 of taxable profit in 2026/27, the Personal Allowance taper reduces the standard £12,570 allowance by £1 for every £2 of profit above £100,000: £5,000 above the threshold means a £2,500 reduction, leaving a Personal Allowance of £10,070. Taxable profit is therefore £94,930, with £37,700 taxed at 20% (£7,540) and the remaining £57,230 taxed at 40% (£22,892), giving total Income Tax of £30,432. Class 4 National Insurance is unaffected by the Personal Allowance taper -- it stays at 6% on profit between £12,570 and £50,270 (£2,262), plus 2% above £50,270 (£1,094.60), giving £3,356.60. Total deductions leave £71,211.40 after tax and National Insurance. Because the Personal Allowance taper applies alongside Class 4 National Insurance, the effective marginal rate on profit between £100,000 and £125,140 is around 62% -- higher than the well-known 60% figure quoted for employees, since self-employed people also pay Class 4 National Insurance on the same slice. Increasing pension contributions is the most common way to bring adjusted net income back under £100,000 and recover the lost Personal Allowance.