Estimate your Self Assessment tax bill

Use the Self Assessment tax calculator to estimate your Self Assessment tax bill for the 2024 to 2025 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:

Start now

Part of Set up as a sole trader: step by step

  1. Step 1 Check if being a sole trader is right for you

    1. Find out more about becoming a sole trader

  2. Step 2 Choose your business name

    1. Check the rules for naming your business

  3. Step 3 Check what records you need to keep

    When you start trading you must keep records. This will help you work out your profit or loss for your tax return.

    1. Find out what business records you need to keep

  4. Step 4 Register as a sole trader

    1. Check how to register as a sole trader

  5. Step 5 Check what taxes may apply to you

    1. Check what taxes may apply to you as a sole trader

  6. Step 6 Plan for your tax bill

    You may need to pay Income Tax on your profits and may need to pay National Insurance contributions.

    1. You are currently viewing: Get an estimate of how much you will need to pay
    1. Find out more about Income Tax rates
    1. Find out more about National Insurance rates

  7. Step 7 Get help and support

    1. Sign up for business support emails
    1. Join a webinar or watch a video to learn more about your responsibilities
    1. Find out how to choose a tax agent if you want to use one