Stocks and Shares ISA Explained
If you want your money to work harder over the long term than a savings account can manage, a stocks and shares ISA is one of the most popular tax-free ways to invest in the UK.
A stocks and shares ISA is a tax-free investment account. You can pay in up to £20,000 in the 2026/27 tax year, invest it in assets like funds, shares and bonds, and pay no tax on any growth, dividends or interest you earn.
In this insight, we explain how a stocks and shares ISA differs from a cash ISA, the £20,000 allowance, an important change coming in April 2027, the risks involved, and how to start.
At a glance
- ISA allowance 2026/27
- £20,000
- Minimum age
- 18
- Tax on returns
- £0
- Tax year ends
- 5 April 2027
Key Takeaways
- A stocks and shares ISA holds investments rather than cash, aiming for higher long-term growth than savings.
- You can contribute up to £20,000 across all your ISAs in 2026/27, and returns are free of income tax and capital gains tax.
- Investments can fall as well as rise, so a stocks and shares ISA suits money you can leave invested for the medium to long term.
- From April 2027, the amount under-65s can put into a cash ISA is set to fall, making the investment ISA more relevant for some savers.
Stocks and Shares ISA vs Cash ISA
Both are tax-free wrappers, but they hold very different things.
- A cash ISA works like a savings account. You earn interest, your balance doesn't fall in value, and it suits short-term or emergency money.
- A stocks and shares ISA holds investments — funds, individual company shares, investment trusts, bonds and similar. Its value can go up or down, but historically investments have tended to outpace cash and inflation over longer periods.
Neither is automatically "better". Cash offers stability; investing offers growth potential in exchange for accepting risk. Many people use both. Our guide to your ISA allowance explains how the different ISA types fit together.
The £20,000 Allowance
For the 2026/27 tax year you can pay a total of £20,000 into ISAs. That overall allowance is shared across all ISA types you hold — so if you put £5,000 into a cash ISA, you'd have £15,000 left for a stocks and shares ISA.
Any growth, dividends or interest earned inside the ISA is free of income tax and capital gains tax, and you don't even need to declare it on a tax return. The allowance resets each tax year on 6 April and can't be carried forward, so unused allowance is lost.
The April 2027 Cash ISA Change
An important change is on the horizon. From April 2027, the Government plans to reduce how much of the overall allowance under-65s can hold in a cash ISA, with the limit expected to fall to £12,000 for that group. Savers aged 65 and over are expected to keep the full £20,000 in cash.
The overall £20,000 ISA allowance itself is not changing — but for under-65s, more of it may need to go into a stocks and shares (or innovative finance) ISA to be used in full. If you're a cash saver, it's worth understanding your options ahead of the change.
Understanding the Risk
The trade-off for potential higher returns is risk. The value of investments can fall, and you could get back less than you put in. Key points to keep in mind:
- Time horizon matters. Investing generally suits money you won't need for at least five years, giving markets time to recover from dips.
- Diversification helps. Spreading money across many companies, sectors and regions — often through funds — reduces the impact of any single investment doing badly.
- Drip-feeding smooths the ride. Investing regularly rather than all at once is known as pound cost averaging, which can reduce the risk of buying at the wrong moment.
If you're completely new, our guide to investing for beginners in the UK is a good starting point.
How to Start
Opening a stocks and shares ISA is straightforward:
- Choose a provider — banks, investment platforms and robo-advisers all offer them. Compare fees, available investments and ease of use.
- Decide how hands-on to be. Ready-made portfolios pick and manage the investments for you; a self-select ISA lets you choose your own funds and shares.
- Set up contributions. You can invest a lump sum, regular monthly amounts, or both.
- Review periodically to make sure your investments still match your goals and attitude to risk.
You'll need to be a UK resident aged 18 or over, and have your National Insurance number to hand.
Frequently Asked Questions
Can I have a cash ISA and a stocks and shares ISA in the same year?
Yes. You can pay into more than one type of ISA in a tax year, as long as your total contributions stay within the £20,000 allowance.
Can I lose money in a stocks and shares ISA?
Yes. Unlike cash, the value can fall. The tax wrapper protects your returns from tax but does not protect you from investment losses.
Can I take money out when I need it?
Generally yes — most stocks and shares ISAs let you sell investments and withdraw. But because values fluctuate, it's best kept for money you can leave invested.
Do I pay tax when I withdraw?
No. Withdrawals from an ISA are tax-free, whatever the growth.
This is general information, not personal financial advice. If you're unsure whether investing is right for you, consider speaking to a qualified adviser.
