Missed the self assessment deadline. What happens?

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Ok, I'm new to tax self assessment, and I believe I was supposed register before October, but like an idiot I've just missed the deadline by a day, I think (although, in my defence, the bad bout of Covid didn't help).
What happens? Will I receive a fine? If I register over the weekend, will I dodge whatever (I'm guessing you can register online)?
Thanks.
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1. Register now for Self Assessment
Point 3 applies irrespective of when the return is due to be filed. You might not need to file your return until say 20 Feb 2023 (if it is eventually issued on 20 November 2022) but you must pay the tax by the normal due date.
https://www.gov.uk/report-and-pay-your-capital-gains-tax
What sort of asset did you dispose of? If it was property it should have been reported within 60 days of disposal and some items you don’t have to declare such as cars or watches.
https://www.gov.uk/capital-gains-tax-personal-possessions/limited-lifespan