Sole trader tax calculator 2026/27

Enter your expected profit for the tax year and see income tax, Class 4 National Insurance and what you keep.

Turnover (sales) for the year Allowable expenses Other taxable income (employment, pension) — optional

Class 2 NI is no longer compulsory. If your profit is below the small profits threshold you can pay it voluntarily to protect your State Pension record.

Estimated tax and NI for

£0

Profit (turnover − expenses)
Income tax
Class 4 National Insurance
Total to HMRC
Take-home for the year
Take-home per month
Effective rate on profit

Get the 2026/27 self-employed tax calendar (free PDF)

Assumes a standard personal allowance (tapered above £100,000), no student loan, no pension contributions, and England/Wales/NI bands. Scottish income tax bands differ. Not tax advice.