How do I calculate capital gains or losses from cryptocurrency?

When you sell a cryptocurrency for more than what you paid, the difference is considered a capital gain. If you sell for less, then this difference is considered a capital loss.

If you are the one who has sold a cryptocurrency for more than what you paid, then you owe taxes on this capital gain. If you are the one who paid less, then this is considered a capital loss. Capital losses are deductible against other capital gains.