Question on eligibility of UK Tax Resident

I just mirgated to UK on 05-March-2024 and I knew I am a UK Tax Resident since 04-September-2024 (05-March-2024 + 183 days). However, for the tax year 06-April-2023 to 05-April-2024, I just lived in the UK 30 days, which is less than 183 days, such that I think I am not eligible to become a UK Tax Resident for the tax year 06-April-2023 to 05-April-2024. Thus, I do not need to submit the Self Assessment form for that tax year 06-April-2023 to 05-April-2024. May I know if I am correct? If yes, do I need to declare a split year treatment dated on 05-March-2024 for the next tax year 06-April-2024 to 05-April-2025, so as to separate my foreign incomes before 05-March-2024? Thank you.

Hi,
As you arrived in the UK in March 2024, you would be tax non resident for the whole tax year, 2023 to 2024.  
You would only need to complete a 2023 to 2024 Self Assessment tax return, if you had foreign income or capital gains arising between 6 March 2024 and 5 April 2024.  
You do not declare your non UK income and, or, capital gains arising 6 April 2023 to 4 March 2024 in the tax return.
Thank you.