A Stocks and Shares ISA is a tax-free account for investing. You put money in, choose investments such as funds or shares, and any growth, dividends or interest are free of UK tax for as long as they stay inside the ISA. You can pay in up to £20,000 a year in 2026/27 across all your ISAs, and you must be 18 or over and UK resident to open one.
The key idea is that the ISA is a wrapper, not an investment. It does not decide what your money is invested in or how it performs; you do. This short guide explains what that means in practice. When you are ready to start, our guide to how a Stocks and Shares ISA works takes you through choosing and opening one.
The wrapper idea
Think of the ISA as a box with a tax shield around it. Whatever you put in the box, such as a global index fund, individual company shares or bonds, grows without Capital Gains Tax, dividend tax or Income Tax. Outside an ISA, gains above the £3,000 Capital Gains Tax exempt amount and dividends above the £500 dividend allowance can be taxed. Inside, you never pay tax on them and you do not have to report them on a tax return.
What you can hold in one
Most providers offer a wide range of investments.
- Funds, including index trackers and actively managed funds
- Exchange-traded funds (ETFs) and investment trusts
- Shares in individual companies listed on recognised stock exchanges
- Government and corporate bonds
- Cash, held while you decide what to buy
How it differs from a Cash ISA
| Cash ISA | Stocks and Shares ISA | |
|---|---|---|
| Returns | Interest at a set or variable rate | Growth and income from investments |
| Can you lose money? | No (except to inflation) | Yes, values can fall |
| Best for | Short-term goals and emergency funds | Goals five or more years away |
| FSCS protection | £120,000 per bank | £85,000 if the provider fails; no cover for falls in value |
From 6 April 2027 under-65s can put a maximum of £12,000 a year into Cash ISAs, while the overall £20,000 limit stays, so more savers will use a Stocks and Shares ISA for the rest. Our Cash ISA vs Stocks and Shares ISA guide compares them in detail.
The main rules
A few rules cover almost everything you need to know.
- You can pay in up to £20,000 a year across all your ISAs, and the allowance resets on 6 April. Unused allowance does not carry over
- Since April 2024 you can open and pay into more than one Stocks and Shares ISA in the same tax year
- You can withdraw at any time, though selling investments can take a few days. Withdrawing usually uses up allowance for good unless the ISA is flexible
- Transfer between providers using the new provider's ISA transfer process, never by withdrawing, or you lose the tax-free status
- Children can have a Junior ISA instead, with a £9,000 yearly limit
What it costs
You usually pay a platform fee for the account, charged as a percentage of your holdings or a flat monthly fee, plus the ongoing charges of any funds you hold and sometimes dealing fees when you buy or sell. Fees reduce your returns every year, so compare them before choosing a provider. Comparison tables from Which? and MoneySavingExpert show current charges. Our article on investing £100 shows why fee type matters at small amounts.
Is it right for you?
A Stocks and Shares ISA suits money you will not need for at least five years, once you have an emergency fund and no expensive debt. Over shorter periods, investment values can fall and may not recover in time. See how regular investing could grow with our investment calculator, and keep an eye on your allowance with the ISA allowance tracker. If building up the monthly amount is the hard part, SYM suggests a small sum to set aside each day.
Frequently asked questions
What is a Stocks and Shares ISA in simple terms?
Can you lose money in a Stocks and Shares ISA?
How much can I put in a Stocks and Shares ISA?
Do I pay tax when I take money out of a Stocks and Shares ISA?
Can I have a Stocks and Shares ISA and a Cash ISA?
- Stocks and Shares ISA
- ISA explained
- investing for beginners
- tax-free investing
- ISA allowance