CGT is a tax on the profit when an asset that has increased in value is sold or disposed of. Such assets could include: Shares not held in a PEP or ISA Property apart from your main home A business asset such as plant and machinery Your main home in any of the following circumstances if: It hasn’t always been your main home You have let it at any point in time You’re using it as a place of business It has a significant amount of land attached to it Most personal possessions that are worth more than £6,000