RE: Self assessment tax return submission deadline date and submission method

Hi. I have applied for UTR number and finally got my UTR number letter from HMRC in Jul2023. Together with that UTR number letter, I received another letter (dated 6Jul2023) told me to do self assessment tax return on time. Inside the letter, I was told to file the tax return by 31January2024 (or 3 months after the date of this notice, whichever is later). The letter also told me to file the tax return online. My questions are: (a)I have no choice but must do the file online? Or I can choose either online or by post? (b)My submission deadline are 5Oct2023 or 31Jan2024? Thanks

Hi ERM2023,
The paper filing deadline is 31/10/2023 and 31/01/2024 for online.
The online return is processed straight away and the paper return needs to be processed by HMRC.
If you file online you can see any amount you owe or are due as a refund straight away.
If you wish to complete a paper return you will need to contact the Self Assessment helpline and advise which pages you require for the return.
Self Assessment: general enquiries
Thank you.