Tax calculators

Tax calculators can be a useful tool for tax planning and cashflow forecasting. Here is a round-up of the best tax calculators available online, including those from official bodies such as HMRC and the Valuation Office

There are different calculators to help you with different tax liabilities. An income tax calculator, for example, can help you estimate future tax bills, while a company car tax calculator can help you compare the tax impact of different company car choices.

Bear in mind that tax calculators are based on standard assumptions. If your tax affairs are more complicated or if you need detailed advice, talk to an accountant.

Income tax and National Insurance calculators

Income tax calculators can be used to calculate your own income tax if you are an employee of your own company, and other employees’ income tax liabilities.


You should not use the income tax calculators above if you are self-employed. A self-employment income tax calculator needs to take into account the different NICs paid, and any allowable business expenses.

The HMRC self-assessment ready reckoner provides a simple calculation of income tax and Class 4 NICs. You can get a clearer idea of your tax liabilities by completing your tax return online or by taking advice from your accountant.


The rules on IR35 have changed, so do your research. If in doubt, always take advice from a qualified accountant.

Payroll calculators


Company car tax calculators

Corporation tax calculators


For a fuller assessment of your tax liability, you should take advice.

VAT calculators

  • HMRC tool to work out VAT fuel scale charges on business cars with private use.

Capital Gains Tax calculator

Property tax calculators

As with all the calculators listed, you may want to take advice to get a full picture of your tax liabilities and any opportunities to minimise tax.

What does the * mean?
