How to Register for Self-Assessment

If you donโ€™t already file a Tax Return, you need to notify HMRC that you have income or capital gains to report by 5 October after the end of the tax year. For the tax year ended 5 April 2022, the deadline for registration is 5 October 2022.
You can register at this link...
File your Self Assessment tax return online
GOV.UK
Link to register for Self Assessment for those not Self-Employed
HMRC will issue you with a Notice to File a Tax Return and you should chase this if it is not received.

If you are engaged in financial trading in cryptoassets, you can register your cryptoassets trading business with HMRC at the following link, but it is recommended to seek the advice of a qualified tax professional first.
File your Self Assessment tax return online
GOV.UK
Link to register for Self Assessment for those Self-Employed
You need to register a business with HMRC by the 5 October after the end of the first tax year in business. Tax years run from 6 April to 5 April.
For example, if you started trading 8 April 2021, your first tax return will be for the year ended 5 April 2022 and you need to register with HMRC by 5 October 2022 to avoid penalties.
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Investor with capital gains or miscellaneous income
Financial Trading in Cryptoassets