Individual savings accounts (ISAs) are used either to save cash or to invest in stocks and shares and represent a tax-efficient way of doing so. Since 2014, money can be paid into either a Cash ISA or a Stocks and shares ISA, or a combination of the two. You can contribute up to £20,000 (2019/20) each year into an ISA. They are highly tax efficient because you are not required to pay Capital Gains tax on the growth, or any Income Tax on the dividends received or withdrawals made from this type of account.