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For the Diary
October
5

Self-assessment deadline

October 5th is the deadline for registering for self-assessment, if you've become self-employed in the previous tax year.

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You must register for self-assessment by October 5th, if you have to send a tax return, and have not sent one before.

i.e. if you generated self-employed income between April 2023-April 2024, you must register for self-assessment by October 5th 2024.

Self-assessment is the process of reporting your income and expenses to HMRC, so you can ensure you’re paying the correct amount of tax.

If you don’t register for self-assessment if required, you may be subject to a fine and late payment penalties.

You only need to register once - you don’t need to register each time you start a new tax year.

Advice and guides from the ecosystem

gov.uk
Register for Self Assessment
The official tool to help register for Self Assessment, including information on the registration process and important deadlines.
gov.uk
Guides and Resources on Self Assessment
Official articles on self-assessment from the UK government.
Coconut
Key deadlines and dates for self-assessment
A list of key deadlines and dates for self-assessment, including the self-assessment registration deadline.
Low Incomes Tax Reform Group
Don’t panic if you missed the 5 October Self Assessment registration deadline, all is not lost!
Pragmatic advice on what to do if you missed the Self Assessment registration deadline.