United KingdomSole Trader Self-Assessment & Class 4 NICsBusinessUK Sole Trader Self-Assessment Tax & Class 4 National Insurance Calculator
Calculate HMRC Self-Assessment liabilities for sole traders and freelancers: Income Tax (£12,570 Personal Allowance, 20% Basic, 40% Higher) and Class 4 National Insurance (6% between £12,570 and £50,270, plus 2% above £50,270).
Calculator Inputs
Live Real-TimeTotal Combined Self-Assessment Bill (Income Tax + Class 4 NICs)
Net Take-Home Cash Remaining
£38,048.2
Class 4 National Insurance (6% / 2%)
£2,065.8
Detailed Calculation Breakdown
Calculation Methodology
Taxable Profit = Total Turnover - Allowable Business Expenses. Class 4 NIC = 6% (£12,570 to £50,270) + 2% (>£50,270). Income Tax = Standard progressive PAYE tax brackets.
Important Legal & Educational Disclaimer
Class 2 NICs are now abolished/treated as paid. Class 4 NIC main rate is 6% following recent autumn budget cuts.
This calculator is designed for educational and informational purposes only based on public statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimations. Always verify with the relevant official authorities or a certified professional advisor.
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