Self Assessment key tax dates

• 5 April, 2024
  Deadline for claiming tax overpaid for the 2019/20 tax year under Self Assessment
  
  

• 6 April, 2024
  First day of the new tax year 2024/25 it's time to gather detailed documents for your 2023/24 tax return
  
  

• 5 October, 2024
  Deadline to register with the HMRC if you became self-employed or started receiving income from property. (You should submit a form CWF1 for self-employment or form SA1 for non-self-employed income to HMRC.)
  
  

• 31 October, 2024 (Midnight)
  Deadline for paper Self Assessment returns for 2023/24 tax year
  
  

• 30 December, 2024
  Deadline for online submission of Self Assessment tax returns for year ending 5 April 2023 for HMRC to collect employment or pension income tax through PAYE tax codes if less than tax codes if less than £3,000 is owed
  
  

• 31 December, 2024
  Deadline for filing your company’s annual accounts if you have a limited company with an accounting year end of 31 March
  
  

• 31 January, 2025 (Midnight)
  Deadline for online Self Assessment tax returns for 2023/24 tax year &
  Deadline for paying tax bill for tax year ending 5 April 2023/24
  
  

• 5 April, 2025
  End of tax year 2024/25