... that is of course before I sell it and, hopefully, make a profit. Before I sell it, can I claim the cost of the Bitcoin as an expense?
Im not an expert by any means, but I have been putting money in ethereum and it has done much better than my bitcoin has. I put a little bit of money on quite a few different crypto currencies and they have all performed better than bitcoin has.
1. It's not an investment, but a gamble. Don't compare Bitcoin to buying a server or a digger. Think of Bitcoin or Deleriums as being more or less the same thing as BetFred or Foxy Bingo. 2. A business expense must be in a field relevant to your core business. 3. The full details are here - https://www.gov.uk/government/publications/tax-on-cryptoassets/cryptoassets-tax-for-businesses
Presumably you are self employed? I'm not a tax expert, but my understanding is that your gains aren't taxable as an individual investor but are if you do it through a business