Estimate your Self Assessment tax bill
Use the Self Assessment tax calculator to estimate your Self Assessment tax bill for the 2025 to 2026 tax year.
This service is also available in Welsh (Cymraeg).
Enter your estimated weekly or monthly income to get an idea of how much Income Tax and Class 4 National Insurance (if you’re self-employed) you’ll pay.
The estimate you get will be calculated as if you get the standard Personal Allowance.
To get an estimate, you’ll need to provide details of any:
- profits from self-employment
- rental income from property
- income from a State Pension or occupational pension
- income from paid employment
The calculator will not take into account:
- the High Income Child Benefit Charge
- any income from savings and investments
- any other payments you’ve made, such as payments towards your next tax bill or any tax and National Insurance from paid employment