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Taxation from variations in currency
According to the answers to this question, you generally aren't taxed on gains until you sell the asset in question. None of those answered specifically for the U.K., so perhaps someone else will be able to weigh in on that. To apply those ideas to your question, yes your gains and losses are taxable. If you originally traded something worth $100 for the bitcoins, then when you converted back to dollars you received $200, you would have a $100 gain, simply on the foreign exchange trade. That is, this $100 of income is in addition to any income you made from your business (selling goods).