Are bitcoin gains taxable uk?

It depends on how you earned your bitcoin and what you use it for. If, for example, you mined bitcoins or received them as payment for goods or services, then the gains would be taxable. However, if you bought bitcoins for investment purposes and then sold them at a higher price, the gain would not be taxable. To find out more specific information about your individual situation, it's best to speak with an accountant or tax specialist.