2026 to 2027 tax year · Free · No sign-up
Self-employed tax calculator 2026/27
Your Income Tax, Class 4 National Insurance and — the part that catches people out — your payments on account. See how much to put aside each month, and whether Making Tax Digital applies to you.
How it works
- Income Tax: Personal Allowance £12,570 (reduced by £1 for every £2 over £100,000), then 20% to £50,270, 40% to £125,140 and 45% above. In Scotland: 19%, 20%, 21%, 42%, 45% and 48%.
- Class 4 National Insurance: 6% on profits from £12,570 to £50,270, 2% above. Class 2 is no longer payable — it is treated as paid if your profits are £7,105 or more.
- Payments on account: if your Self Assessment bill is £1,000 or more (and less than 80% was taken at source), you pay two advance instalments of half your bill on 31 January and 31 July. In your first year, January can feel like paying 1.5 years at once.
- Mortgage interest on rental property gives a 20% tax credit instead of a deduction. From 6 April 2027, property income gets its own rates: 22%, 42% and 47%.
An estimate, not tax advice. It does not include student loans, pension contributions, dividends, savings interest, Marriage Allowance or losses. If you are over State Pension age, you do not pay Class 4.
Does Making Tax Digital apply to you?
It depends on your turnover plus rent — not your profit. Check your date and get a plan.
Sources: GOV.UK — Income Tax rates, Scottish Income Tax 2026 to 2027, self-employed National Insurance rates, payments on account, property rates from 2027. Checked 9 October 2026.