HM Revenue and Customs (HMRC) must receive your tax return and any money you owe by the deadline.
The last tax year started on 6 April 2022 and ended on 5 April 2023.
Deadline for telling HMRC you need to complete a return and so advising you are self employed
You must tell HMRC by 5 October if you need to complete a tax return and have not sent one before.
Deadline for submitting a paper return
If you’re doing a paper tax return you must submit it by midnight 31 October 2023.
Deadline for submitting an online return
If you’re doing an on line tax return you must submit it by midnight 31 January 2024.
Deadlines for paying tax you owe
You need to pay the tax you owe by midnight 31 January 2024.
There’s usually a second payment deadline of 31 July if you make advance payments towards your bill (payment on account)
You will usually pay a penalty you’re late. You can appeal against a penalty if you have a reasonable excuse
This Information taken directly from HMRC
