This tool provides rough estimates for planning purposes only. It is not a tax return, not legal or financial advice, and not a substitute for a qualified tax professional. Tax laws change annually and individual circumstances vary significantly — your actual tax bill may differ substantially from this estimate.
The calculator uses simplified bracket calculations and published rates for the selected tax year. It does not account for every deduction, credit, surtax, phase-out, surcharge, or special rule that may apply to your situation. Always consult a qualified accountant before making financial decisions based on any estimate.
Full tax calculations are available for 5 countries. If your country is not listed, select Other for guidance on what to do.
Select your country, enter your revenue and click Calculate.
Self-employment tax systems are highly complex and change annually. We support Canada, USA, UK, Australia and New Zealand because their rules are clearly documented in English, reliably calculable with publicly available rates, and these countries represent the majority of our users. Adding other countries without sufficient confidence in accuracy would risk giving people dangerously wrong numbers. For countries not supported, we explain what to do and link directly to the official tax authority.
For straightforward cases — self-employed with no other income, using standard deductions — estimates are typically within 5-15% of the actual amount. Complex situations involving multiple income streams, rental income, capital gains, foreign income, business losses, or special credits may differ significantly. Use this tool for planning (deciding how much to set aside, whether to pay installments) not for filing. Always have a professional review your actual return.
Self-employment tax in the US is the combined Social Security (12.4%) and Medicare (2.9%) contribution paid entirely by self-employed individuals, totalling 15.3% on net self-employment income up to the Social Security wage base ($176,100 for 2025). Income above that threshold continues to attract the 2.9% Medicare portion. You can deduct half of SE tax from your gross income. This is separate from and in addition to federal and state income tax.
National Insurance Class 4 is paid by self-employed people on their trading profits. In 2024/25, Class 4 NI is 6% on profits between the Lower Profits Limit and the Upper Profits Limit, and 2% on profits above that. Class 2 NI was abolished from April 2024. NI contributions count toward your State Pension entitlement. Together with income tax, these are the primary tax obligations for UK self-employed people.
The Canada Pension Plan (CPP) is a mandatory retirement contribution. Employees pay one share and their employer pays the other. Self-employed Canadians pay both shares — effectively double the employee rate. The combined 2025 rate is 11.9% on net self-employment income between the basic exemption ($3,500) and the maximum pensionable earnings ($73,200). Half of your CPP contributions are deductible from income, partially offsetting the cost.
Registration thresholds vary significantly: Canada GST/HST is required above CAD $30,000 in taxable revenue per year. UK VAT registration is required above GBP 90,000 (2024/25). Australia GST is required above AUD $75,000. New Zealand GST is required above NZD $60,000. The USA has no federal sales tax but individual states have varying sales tax nexus rules. Once registered, you charge the tax on your invoices and remit it to the government on a regular schedule.