Self-Employed Tax Calculator 2026/27 (UK sole traders)
If you're a sole trader or freelancer, enter your profit (income minus allowable expenses) to see your income tax, National Insurance and what to put aside for your Self Assessment bill.
Estimates for information only, using 2026/27 rates for England, Wales and Northern Ireland unless stated. Not financial or tax advice; check your own situation with HMRC or a qualified adviser.
How it works
Self-employed people pay income tax on profits at the same rates as employees, after the Β£12,570 personal allowance.
Class 4 National Insurance is 6% on profits between Β£12,570 and Β£50,270, and 2% above that. Class 2 NI is no longer compulsory; you can pay it voluntarily (Β£3.65 a week in 2026/27) to protect your State Pension record if your profits are under Β£7,105.
If your bill is over Β£1,000, HMRC usually asks for payments on account: two advance payments towards next year's bill, each half of this year's.
Frequently asked questions
How much should I save for tax as a sole trader?+
A common rule is 20β30% of profit, but use the calculator: it shows your actual bill and the effective rate.
Do I still pay Class 2 National Insurance?+
Not compulsorily. Since April 2024 it's voluntary, mainly useful if your profits are below Β£7,105 and you want the year to count towards your State Pension.
When is the Self Assessment deadline?+
31 January after the end of the tax year, for both filing online and paying.