Capital Gain Calculator 2025. Capital gains tax is the tax taken from the profit you have gained when you sell or dispose of an asset which has increased in value Use our capital gains tax (cgt) calculator to work out how much tax you might have to pay.

With just a few details—such as the purchase price, selling price, and associated costs—you can quickly work out how much. Capital gains tax is the tax taken from the profit you have gained when you sell or dispose of an asset which has increased in value