This is the tax paid on the profits made when an asset is sold. Unless units and shares are held through a pension plan, ISA or tax-exemption system, any profits (above the annual allowance) made through the sale of assets is taxable. No CGT is payable on transactions within an authorised fund and investors will only need to consider CGT when selling units in the fund itself.
Tax treatment depends on the individual circumstances of each investor and may be subject to change in future.