What Is an ISA and How Does It Actually Work?

An ISA is a tax-free wrapper around savings or investments — you pay no income or capital gains tax on what you earn inside it. You can put up to £20,000 a year across the different ISA types, and there are four main kinds to know.

Last reviewed: 30 May 2026 · 2 min read

Key Facts

You can pay in up to £20,000 a year tax-free (2026/27)
Interest, dividends and gains inside an ISA are all tax-free
The four main types are cash, stocks and shares, lifetime and innovative finance

The basic idea

ISA stands for Individual Savings Account. It's not a product in itself but a tax-free wrapper you put savings or investments inside. Whatever interest, dividends or gains you make within it are free of tax, which is what makes ISAs so useful.

Every UK adult gets an annual allowance — £20,000 for 2026/27 — that resets each 6 April. Money you've sheltered in previous years stays tax-free and doesn't count against future allowances.

The main types

There are four adult ISAs. A cash ISA works like a tax-free savings account. A stocks and shares ISA holds investments. A Lifetime ISA adds a 25% government bonus for a first home or retirement. An innovative finance ISA covers peer-to-peer lending and is higher risk.

You can split your £20,000 across them as you like, subject to the Lifetime ISA's £4,000 cap. For most young savers, a cash ISA for short-term money and a stocks and shares or lifetime ISA for long-term goals covers the bases.

FAQ

Frequently Asked Questions

Do I pay tax when I take money out of an ISA? +

No. Withdrawals from an ISA are completely tax-free, whether it's interest from a cash ISA or gains from investments. That's the whole point of the wrapper — there's no tax to pay going in from your taxed income, and none coming out either.

Is an ISA better than a regular savings account? +

If you'd otherwise pay tax on your savings interest, yes. The personal savings allowance lets many basic-rate taxpayers earn some interest tax-free outside an ISA, but an ISA shelters everything regardless of how much you earn or save. Compare the actual interest rates too, as a non-ISA account sometimes pays slightly more.

Can I have more than one ISA? +

Yes. You can hold multiple ISAs and, since April 2024, even pay into more than one of the same type in a single tax year — except Lifetime and Junior ISAs. The only limit is that your total contributions across all of them stay within the £20,000 annual allowance.

Topics covered

isas savings beginners

This article is for informational purposes only and does not constitute financial advice. Always do your own research or speak to a qualified financial adviser before making financial decisions.