UK Self-Employed Tax Calculator
Estimate your income tax and Class 4 National Insurance on self-employment profit.
Net Profit After Tax & NI
£32,868.20
- Income tax
- £5,486.00
- Class 4 NI
- £1,645.80
- Total tax & NI
- £7,131.80
- Tax year
- 2024/25
Assumptions
- England/Wales/Northern Ireland rates only
- Class 2 NI is not modeled — see gov.uk for current Class 2 rules
How it's calculated
Taxable income = profit − Personal Allowance, taxed progressively. Class 4 NI is charged on profit above the lower profits limit.
Worked example
£40,000 in annual profit has income tax and Class 4 NI calculated, shown live above.
Frequently asked questions
Does this include Class 2 NI?
No — Class 2 NI is a smaller flat weekly amount with its own rules and is not modeled here.