Business Tax in the USA (2026)
US sole proprietors and single-member LLCs pay self-employment tax of 15.3% on the first $168,600 of net earnings in 2026, plus federal income tax at graduated rates from 10% to 37%. After deducting the 50% SE tax deduction and the qualified business income (QBI) deduction (20% for eligible pass-through businesses), effective federal tax rates for self-employed individuals earning $80,000 often land around 25%–30% combined.
Business Tax in the UK (2026)
UK sole traders pay income tax at 20% on profits between £12,571 and £50,270, rising to 40% on profits above this threshold. Class 4 National Insurance adds 9% on profits between £12,570 and £50,270, and 2% above that. Corporation Tax for limited companies is 25% on profits over £250,000 (with marginal relief between £50,000 and £250,000) as of 2026.
Business Tax in South Africa (2026)
South African small business corporations pay tax at 0% on the first R95,750, then 7% up to R365,000, 21% up to R550,000, and 28% thereafter (standard corporate rate). Sole proprietors are taxed at individual income tax rates, which range from 18% to 45% progressively. VAT registration is compulsory above R1 million in turnover.
Business Tax in Australia (2026)
Australian small businesses (turnover under AUD 50 million) pay company tax at 25%. Sole traders are taxed at marginal personal income tax rates from 19% to 45%. The low income tax offset reduces effective tax for incomes under AUD 66,667. The small business CGT concessions and instant asset write-off continue to offer significant deductions in 2026.
Key Takeaways
- Don't rely on gut feeling — use numbers and a clear formula
- Review and adjust your figures at least once per year as costs and market rates change
- Use our free calculator above to apply these concepts to your specific situation
- Compare your results against industry benchmarks and adjust accordingly