tax return form

Self-assessment

  • How to declare tax through a self-assessment return
  • Self-employed tax returns
  • Deadlines for self-assessment
  • Paying tax through self-assessment   

What's in this guide

Self-assessment tax returns

Key considerations for those making a self-assessment tax return. How to submit a return and the deadlines you need to meet.

Self-assessment online

Making an online self-assessment tax return. How to register with HMRC and submit your figures in time to meet the 31 January deadline.

Which? Limited (registered in England and Wales number 00677665) is an Introducer Appointed Representative of Which? Financial Services Limited (registered in England and Wales number 07239342). Which? Financial Services Limited is authorised and regulated by the Financial Conduct Authority (FRN 527029). Which? Mortgage Advisers and Which? Money Compare are trading names of Which? Financial Services Limited. Registered office: 2 Marylebone Road, London NW1 4DF.