A Stocks and Shares ISA is an Individual Savings Account that allows you to invest in the stock market — in funds, shares, bonds and other investments — without paying UK tax on any growth or income generated. It is one of the most widely used investment accounts in the UK, offering a tax-efficient wrapper around your investments.
Unlike a Cash ISA, where your money earns interest and is not at risk, a Stocks and Shares ISA involves investment risk — the value of what you hold can go up or down, and you may get back less than you put in. In exchange for that risk, the potential returns over the long term are generally higher than cash savings.
How does a Stocks and Shares ISA work?
You open a Stocks and Shares ISA with an investment platform and pay money in — up to the annual ISA allowance of £20,000 per tax year (check gov.uk for the current allowance). Within the ISA, you choose what to invest in from the options your platform offers. Any growth in the value of your investments, and any income (such as dividends) generated, is completely free from UK income tax and capital gains tax.
This tax protection is particularly valuable over the long term. Without an ISA, if your investments grew significantly you would potentially owe capital gains tax when you sold them. Inside an ISA, you pay nothing regardless of how much your investments grow.
What can you invest in within a Stocks and Shares ISA?
The range of investments available depends on your platform, but typically includes funds (including index funds and actively managed funds), exchange traded funds (ETFs), individual shares listed on recognised stock exchanges, investment trusts, and corporate and government bonds. Most people, particularly those new to investing, use funds rather than individual shares, as funds provide built-in diversification across many companies.
Stocks and Shares ISA vs Cash ISA
The choice between a Stocks and Shares ISA and a Cash ISA depends largely on your time horizon and attitude to risk. A Cash ISA offers a guaranteed return (the interest rate) with no risk to your capital, making it suitable for money you might need in the short term or are not comfortable putting at risk. A Stocks and Shares ISA offers the potential for higher returns over the long term, but with the risk that the value of your investments could fall — sometimes significantly — particularly in the short term.
For money you will not need for at least five years and ideally longer, a Stocks and Shares ISA has historically offered better returns than cash over most time periods, though past performance is not a guarantee of future results. For money you may need within one to two years, a Cash ISA or savings account is generally more appropriate.
You can hold both a Cash ISA and a Stocks and Shares ISA in the same tax year, as long as your combined contributions do not exceed the annual allowance.
The annual ISA allowance
The ISA allowance is the maximum amount you can pay into all your ISAs in a single tax year. The current allowance is £20,000 per person per year. This allowance cannot be carried forward — unused allowance from previous years is lost. You can split the allowance across different ISA types in the same year.
Once money is inside an ISA, it retains its tax-free status indefinitely. You can withdraw money from a Stocks and Shares ISA at any time (unlike a pension), though doing so means losing that ISA allowance for the year, as withdrawals are not refunded to your allowance unless you have a flexible ISA.
How to open a Stocks and Shares ISA
To open a Stocks and Shares ISA you need to be aged 18 or over and a UK resident. You choose an investment platform that offers Stocks and Shares ISAs, complete an application (which can usually be done online), and fund your account. Different platforms charge differently — some charge a percentage of your holdings, others a flat fee — so it is worth comparing charges, particularly if you plan to invest a large amount.
Is a Stocks and Shares ISA right for you?
A Stocks and Shares ISA is worth considering if you have money you do not need in the short term, you understand and are comfortable with the risk that investments can fall in value, and you want to invest in a tax-efficient way. It is particularly valuable for those who have already used their Cash ISA allowance or who are higher rate taxpayers with significant investments outside of ISAs.