Sole Trader Tax Calculator 2026/27
Estimate Income Tax and Class 4 National Insurance from your annual self-employed profit.
Estimate Income Tax and Class 4 National Insurance from annual self-employed profit.
Use the calculator below to create a quick planning estimate based on the figures you enter. Results are for guidance and should be checked against current UK tax rules and HMRC guidance where appropriate.
Sole Trader Tax Calculator 2026/27
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Estimate Income Tax and Class 4 National Insurance from annual self-employed profit.
Uses a £12,570 Personal Allowance and the 2026/27 England, Wales and Northern Ireland Income Tax bands. National Insurance is simplified.
How to use this calculator
Enter the figures that best match your situation and select the calculation button. The result is intended as a useful planning estimate rather than a substitute for a tax return or professional advice.
Keep your figures up to date when tax rates, thresholds, costs or business circumstances change.
Frequently Asked Questions
What does the Sole Trader Tax Calculator estimate?
It estimates UK Income Tax and a simplified Class 4 National Insurance liability from annual self-employed profit and optional other taxable income.
What tax year does the calculator use?
The calculator is designed for the 2026/27 tax year and uses the standard £12,570 Personal Allowance and the England, Wales and Northern Ireland Income Tax bands used by the calculator.
Does the calculator include every tax and National Insurance rule?
No. It is a planning estimate and does not model every allowance, relief, benefit, pension contribution, Scottish Income Tax rule or individual National Insurance circumstance.
Is the result a tax return calculation?
No. The result is an estimate for planning. Your actual liability depends on your full circumstances and the figures reported to HMRC.
When should I speak to an accountant?
Consider professional advice if your income is complex, you have significant investments or property income, you are close to a tax threshold, or you need to prepare and submit a tax return.
Important information
This calculator provides an estimate for general planning and educational purposes. It is not a tax return, accounting record or personalised professional advice. Tax rules, rates and thresholds can change, and individual circumstances can affect the result.