If you’re self-employed, it’s not always obvious how much of your income you actually get to keep.
Tax and National Insurance aren’t taken automatically, so it’s easy to underestimate what you’ll owe, especially if your income changes month to month.
This simple calculator gives you a rough estimate of how much tax and National Insurance you may need to pay based on your yearly profit. It’s designed to give you a quick, realistic guide so you can plan ahead and avoid surprises.
You can use it alongside your own records to decide how much to set aside each month.
Self-Employed Tax and NI Calculator
Enter your estimated yearly self-employed profit to get a rough idea of how much tax and National Insurance to set aside.
This calculator gives an estimate only and is based on 2026/27 tax rates for England, Wales and Northern Ireland. It does not include payments on account, student loans, pension contributions, Scottish tax rates, benefits, allowances, or other income.
This calculator is based on UK tax rates for the 2026/27 tax year (England, Wales and Northern Ireland):
- Personal allowance: £12,570
- Income tax:
- 20% (basic rate)
- 40% (higher rate)
- 45% (additional rate)
- National Insurance (Class 4):
- 6% on profits between £12,570 and £50,270
- 2% above £50,270
It does not include things like payments on account, student loans, pension contributions, or Scottish tax rates.
