The self assessment return

I moved to UK on 9 March 2022. But I receive a letter from HMRC that needs me to fill in my tax return for the tax year 6 April 2021 to 5 April 2022.　But I just lived less than 30 days at that financial year. Why I need to complete the tax return？ I want to fill the SA109 , but the deadline of SA109 was on 31 Oct, what can I do now? 　

Hi Joyceice,
If you are looking to claim split year status, this must be done on the SA109 so a tax return is required.
You cannot file online using HMRC software so you will need to submit a paper return or use 3rd party software.
Commercial software suppliers for Self Assessment
For tax year 21/22 the deadline for paper tax returns was 31 October 2023.
Deadlines
Thank you.