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Which? tax calculator 2018-19

Independent, tailored help with your income tax return

Calculate and submit your self-assessment tax return online

We've teamed up with SimpleTax to bring you an online self-assessment tool allowing Which? members to calculate their tax return and submit it directly to HMRC for just £10 (£36 for non-members).

  • Easy to use and jargon-free personal tax calculator
  • Safe and secure - protected by 256-bit encryption
  • A simple and quick way to calculate your tax return
  • Officially recognised by HMRC
  • Tips that could save you money on allowances and expenses you might have missed
Start calculating

Supported income types

  • Employment - SA102 Full/Short
  • Self-employment - SA103 Full/Short
  • Interests and dividends - SA100
  • Property - SA105
  • Income from pensions - SA100
  • Ministers of Religion - SA102M
  • Partnership - SA104 Full/Short
  • Residency - SA109
  • Foreign - SA106
  • Trust - SA107
  • Capital Gains - SA108
Save £26 on your tax return online
- Join Which? Money and pay £10 for your tax return online, not £36
- Call Which? Money Helpline as often as you like – we advise on tax issues
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Try Which? Money for £1
£1 for 1 month then £12.75/month unless cancelled

100% online, recognised by HMRC

Easy to understand forms

Stay on top of your tax money

Nothing to install, runs everywhere

Do I need to complete a self-assessment tax return?

If HMRC has asked you to complete a self-assessment return for 2018-2019, you must complete it before 31 January 2020 or face a £100 fine. Some people (those who are self-employed, for example) need to complete a tax return every year; others are sent one because they have untaxed income (often from property).


Although the publisher endeavours to make sure the information in this calculator is accurate and up-to-date, it is only a general guide nothing in it constitutes taxation advice by Which?. You should consult a qualified tax adviser who can consider individual circumstances if taxation advice is required. Which? Limited does not accept any liability for any loss or damage suffered as a consequence of relying on any information contained in this guide. Which? receives a £10 fee from Which? members who submit a tax return using the SimpleTax calculator. It will also receive a referral fee for any user that pays the £36 fee to submit a tax return using the calculator. You can calculate and submit your tax return for free on the HMRC website. Only your email address will be shared between Which? and SimpleTax in order to verify whether you are a Which? member. All information will be handled in accordance with parties respective privacy policies, for further information please see Which?'s privacy policy or visit SimpleTax’s website.