Simple reminder. You have a £3,000 yearly CGT allowance (used to be £12,300 🙄). You only pay CGT on any profit if you sell your Bitcoin.

A very basic example:

You buy 1 Bitcoin at £50,000. Sell it all at £55,000. A profit of £5,000.

Subtract the CGT allowance of £3,000 from this profit and you pay CGT (18% or 24%) on £2,000.