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L'înformâtion et les sèrvices publyis pouor I'Île dé Jèrri

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How tax works calculator

​Before you start

This calculator will help you understand the basics of how tax works.

It doesn't send any information to Revenue Jersey or make changes to your records with us.

The results you see are based on this year's allowances.


The calculator makes standard assumptions to estimate your tax and long-term care. 

The results can't be used to override or dispute any officially issued notice from Revenue Jersey or be used for financial planning. They are for guidance purposes only.

It can illustrate the most common circumstances but isn't designed for every scenario.

For example, you won't get an accurate estimate if you:

  • share any child tax allowances including additional allowance
  • have dependent children but they don't live with you
  • have complex tax affairs like shareholder distributions, you're in a business partnership, or you get tax credits for being taxed in another country

It also won't give you an indication of your ITIS rate since this depends on your payment history as well as your annual tax bill.

Help videos on YouTube

How to use the calculator (short 2 minute video) on YouTube

Independent Taxation - How to use the Tax Calculator (detailed 8 minute overview) on YouTube

How to use the calculator

Step 1 Enter your information

You can choose to enter your income annually, monthly or weekly. Select your circumstances and then use the sliders or type any figure you want directly into the boxes.

Step 2 Check the results

As you enter or change your details, you'll see how this affects your allowances, how much of your income is taxed and the amount of tax and long-term care.

Select any area of the results graphic to see a breakdown of the amounts.

Step 3 Independent taxation check

If you said you were married or in a civil partnership, you'll be able to get an illustration of how independent taxation might affect you. If your independent tax illustration is higher, you may want to wait until the compensatory allowance is introduced when Independent Taxation becomes mandatory.

Note about allowances

The allowances for children and mortgage interest are split equally by the calculator to give an illustration. If you each pay your mortgage and childcare payments in a different proportion or you choose to share child allowance in a more tax efficient way the illustration won't reflect this.   

Note about separate assessments

If you're married or in a civil partnership but made an election for separate assessments you'll need to enter both your incomes so the calculator can work out what allowances you receive.

How Tax Works
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