UK Tax Calculator
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All you need to do is select the tax year you want to calculate your liability for, input your annual gross income and click 'Calculate'. The app will then break down the tax you're paying (or have paid) at each of the Pay As You Earn (PAYE) and National Insurance (NI) tax bands.
It will also display your net (i.e. after tax) income and your effective tax rate (i.e. tax paid divided by your annual gross income).
Note: this app is for indicative purposes only. You should consult a tax advisor for a full and accurate assessment.