Individual Savings Accounts (ISAs) are one of the simplest ways to save or invest tax-efficiently. Any interest, dividends or growth you earn inside an ISA is free from UK income tax and capital gains tax, and you don’t need to declare it on a tax return. But there are several types, and choosing the right one depends on what you’re saving for.

Your annual allowance

Each tax year (6 April to 5 April), adults can pay up to a set limit into ISAs, currently £20,000. You can put it all in one ISA or split it across different types. Any allowance you don’t use is lost at the end of the tax year, so it can’t be carried forward. The government has announced changes to how much can go into cash ISAs from April 2027 for many savers, so check the latest rules before planning ahead.

The main types of ISA

Cash ISA

Works like a savings account, but the interest is tax-free. Your capital isn’t exposed to investment risk, which makes cash ISAs suitable for short-term goals and emergency funds. Over long periods, though, returns may not keep pace with inflation.

Stocks and shares ISA

Lets you invest in funds, shares, bonds and other investments. There’s more potential for growth over the long term, typically five years or more, but the value can fall as well as rise. Suitable for longer-term goals where you can ride out ups and downs.

Lifetime ISA

Designed to help people buy their first home or save for later life. You can open one between 18 and 39 and pay in up to £4,000 a year (which counts towards your overall allowance), and the government adds a 25% bonus. Withdrawals for anything other than a qualifying first home purchase or after age 60 usually face a 25% charge, which means you could get back less than you paid in. There’s also a cap on the price of the property you can use it for.

Innovative Finance ISA

Holds peer-to-peer loans and certain other investments. These can carry a higher risk and aren’t usually protected by the Financial Services Compensation Scheme in the same way as cash deposits.

Junior ISA

A tax-free account for children under 18, with its own separate annual allowance. The money belongs to the child and becomes accessible when they turn 18.

How to choose

• Need the money within a few years? A cash ISA is usually more appropriate.
• Investing for five years or more? A stocks and shares ISA may offer better growth potential.
• Buying your first home, aged 18 to 39? A Lifetime ISA could give you a significant boost.
• Saving for your children? A Junior ISA keeps their savings separate and tax-free.

Many people use a combination: a cash ISA for accessible savings alongside a stocks and shares ISA for long-term growth.

Transferring an ISA

If you find a better rate or want to change provider, always use the official ISA transfer process rather than withdrawing the money yourself. Otherwise you may lose the tax-free status of those savings.

ISA allowances and rules are set by the government and can change. Tax treatment depends on your individual circumstances.

The value of investments can go down as well as up, and you may get back less than you put in.

If you’d like help deciding how ISAs fit into your wider savings, investment and retirement plans, get in touch for a free consultation.