UK & Australia Tax Calculators
Tax systems in the United Kingdom, Australia, and Canada each have their own rules, rates, and thresholds. Our 11 tax calculators cover the essentials for residents and taxpayers in these countries. UK taxpayers can estimate income tax across all bands, calculate National Insurance contributions, check stamp duty on property purchases, and plan for inheritance tax. Australians can project superannuation balances, estimate HECS-HELP repayments, calculate stamp duty by state, and work out GST. Canadian users have a dedicated GST calculator, and everyone can use the VAT tool for European transactions. All calculators use current tax year rates and run entirely in your browser.
United Kingdom
Income tax, National Insurance, stamp duty, and inheritance tax for UK residents.
Income Tax Calculator (UK)
Estimate UK income tax across basic, higher, and additional rates.
National Insurance Calculator
Calculate Class 1 NI contributions for employees and employers.
Stamp Duty Calculator (UK)
Estimate SDLT on property purchases in England and Northern Ireland.
Inheritance Tax Calculator (UK)
Estimate IHT liability on estates above the nil-rate band.
Australia
Superannuation, HECS-HELP, stamp duty, GST, and Division 296 for Australian taxpayers.
Superannuation Calculator
Project your super balance at retirement with employer contributions.
HECS-HELP Calculator
Estimate annual HECS-HELP repayments based on your income.
Stamp Duty Calculator (Australia)
Calculate stamp duty on property purchases by Australian state.
GST Calculator (Australia)
Add or remove 10% Australian Goods and Services Tax.
Division 296 Tax Calculator
Estimate the proposed 15% tax on super balances above $3M.
Canada & International
Canadian GST and international VAT calculators.
Frequently Asked Questions
How does UK income tax work?
UK income tax uses a progressive system with a personal allowance (currently £12,570 tax-free), then 20% basic rate, 40% higher rate, and 45% additional rate. The personal allowance tapers for income above £100,000. Scotland has its own rates. Our calculator handles all bands and the personal allowance taper automatically.
What is National Insurance and how is it calculated?
National Insurance (NI) is a UK payroll tax that funds state pension and benefits. Employees pay Class 1 NI at 8% on earnings between the primary threshold and upper earnings limit, then 2% above that. Employers pay 13.8% on earnings above the secondary threshold. Self-employed pay Class 2 and Class 4 NI.
How does Australian superannuation work?
Superannuation is Australia's compulsory retirement savings system. Employers must contribute 11.5% (2024-25 rate) of an employee's ordinary time earnings into a super fund. Employees can make additional voluntary contributions. Our calculator projects your super balance at retirement based on your salary, contribution rate, and expected returns.
What is HECS-HELP and when do I start repaying?
HECS-HELP is Australia's student loan scheme for university fees. Repayment is income-contingent — you only repay when your income exceeds the minimum threshold (currently around $54,435). Repayment rates range from 1% to 10% of your total income depending on your earnings bracket. Our calculator shows your annual repayment based on current rates.