Skilful DesignersTax on £20,000 self-employed profit
On £20,000 of self-employed profit in 2026/27 you pay £1,486.00 income tax and £445.80 Class 4 National Insurance: £1,931.80 in total, 9.7% of your profit. You keep £18,068.20, about £1,506 a month.
Worked out with the Self-employed tax calculatorUpdated
Open this in the self-employed tax calculator
The breakdown
| Profit (turnover minus allowable expenses) | £20,000.00 |
| Personal allowance | £12,570.00 |
| Taxable income | £7,430.00 |
| Income tax at 20% | £1,486.00 |
| Class 4 National Insurance | £445.80 |
| Total tax and NI | £1,931.80 |
| Take-home | £18,068.20 |
That is £1,505.68 a month or £347.47 a week. Your effective rate is 9.7%, and each extra £1 of profit costs 26p.
When you pay it
Tax for 2026/27 is due by 31 January 2028 through Self Assessment. Because the bill is over £1,000, HMRC will usually also ask for two payments on account towards 2027/28, each half of this year’s bill (£965.90), on 31 January and 31 July. In a first year that makes the January payment about £2,898.
Compared with nearby profits
| Profit | Income tax | Class 4 NI | Take-home | Effective rate |
|---|---|---|---|---|
| £15,000 | £486 | £146 | £14,368 | 4.2% |
| £20,000 | £1,486 | £446 | £18,068 | 9.7% |
| £25,000 | £2,486 | £746 | £21,768 | 12.9% |
| £30,000 | £3,486 | £1,046 | £25,468 | 15.1% |
Figures use the 2026/27 rates for England, Wales and Northern Ireland: a £12,570 personal allowance, 20% / 40% / 45% income tax, and Class 4 National Insurance at 6% between £12,570 and £50,270 and 2% above. They leave out student loans, pension contributions and other income. Check your own figures with GOV.UK.
Nearby values
Frequently asked questions
How much tax do I pay on £20,000 self-employed profit?
For 2026/27 in England, Wales and Northern Ireland: £1,486.00 income tax and £445.80 Class 4 National Insurance, £1,931.80 in total. That leaves £18,068.20, or £1,505.68 a month.
How much should I put aside from each invoice?
About 10% of your profit covers the tax and National Insurance on £20,000. In your first year, set aside more: HMRC may also ask for a payment on account towards the next year, so the first January bill can be about £2,898.
What is my marginal rate?
Each extra £1 of profit above £20,000 costs 26p in income tax and National Insurance, because it falls in the basic rate band.
Is it different in Scotland?
Yes. Scotland has its own income tax bands for earned income, so the income tax figure here will be different for Scottish taxpayers. Class 4 National Insurance is the same across the UK.
Cite this page
Skilful Designers. “Tax on £20,000 self-employed profit.” https://skillfuldesigners.co.uk/self-employed-tax/20000/ (updated 5 November 2026).