In the U.K., capital gains tax (CGT) is charged on any profit made when you sell an investment. There is an allowance each year, which is currently £3,000 in the 2024/25 tax year. So if the profit you make from the sale of investments totals less than £3,000, there is no CGT to pay. Remember that investments held and sold through an ISA are not liable for CGT. If you make more than £3,000 in profit, then the capital gains tax rate is 10% or 20% depending on your income tax band. If you make profit from the sale of one cryptocurrency but make a loss on another, then the losses can be offset against the profit of the other. So if you make a £3,000 profit on one crypto asset but a £3,000 loss on another, there would be no CGT to pay.