This page shows income tax and Class 4 NI with a quarterly set-aside estimate using current 2026/27 assumptions. Compulsory Class 2 NI ended from April 2024 (it is now voluntary if profits are under £7,105).
Updated for 2026/27 · Reviewed by James Whitfield · Methodology and assumptions
| Annual profit | £15,000.00 |
| Personal allowance | £12,570.00 |
| Taxable income | £2,430.00 |
| Income tax — Basic rate (20%) | £486.00 |
| Income tax — Higher rate (40%) | £0.00 |
| Income tax — Additional rate (45%) | £0.00 |
| Class 4 NI — £12,570 to £50,270 (6%) | £145.80 |
| Class 4 NI — Above £50,270 (2%) | £0.00 |
| Total deductions | £631.80 |
| Net income | £14,368.20 |
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Monthly net income
£1,197.35
Weekly net income
£276.31
Effective deduction rate
4.2%
Set aside £157.95 per quarter as a savings estimate (a quarter of the year's income tax and Class 4 NI). Because the year's bill is under £1,000, HMRC does not ask for payments on account: the whole amount is due by 31 January after the tax year ends. How quarterly tax works.
For £15,000 profit, the estimate combines income tax by band, Class 2 NI (where applicable) and Class 4 NI, then shows total deductions and net income.
Self-employed people pay Class 4 NI: 6% on profits between £12,570 and £50,270 and 2% above. Class 2 NI stopped being compulsory from April 2024, so it is not included.
About £157.95 a quarter as a savings estimate: a quarter of the year's income tax and Class 4 NI. Because the year's bill is under £1,000, HMRC does not ask for payments on account: the whole amount is due by 31 January after the tax year ends.