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When do I need to submit my Tax Return by?

Once registered as self employed, HMRC will write to you in April/May to request completion of your SA100 Self Assessment Tax Return. However, if you don’t receive a letter, you’ll need to still complete a return.

What is a Tax Year?

‘Tax Years’ run from 6 April – 5 April the following year.

The table below shows recent tax years, and the deadlines for online submission and payment of your taxes.

Tax YearStart DateEndDateDeadline Date*
2020/216 April 20205 April 202131 January 2022
2021/226 April 20215 April 202231 January 2023
2022/236 April 20225 April 202331 January 2024

*The deadline date is when you must pay all tax which is due, including any national insurance contributions and the first Payment on Account (if applicable).


Claire began her self employment on 23 August 2017

This falls within the 2017/18 financial year (6 April 2017 – 5 April 2018)

She must complete her tax return and pay any tax, national insurance and her first payment on account (if applicable) by the 31 January 2019.

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