What are the different types of ISA and which does what?

The word ISA describes a tax wrapper. Inside it can sit an ordinary savings account, an investment portfolio, or a product with government bonuses attached. Understanding it as a wrapper explains most of the confusion — including why one ISA can pay interest and another can fall in value.

Safety

Step by step

1. Check the current allowance on GOV.UK.There is an overall annual limit across your ISAs, and separate limits for some types. The figures are reviewed and have changed several times, so read the current page rather than an article.
2. Understand a cash ISA.A savings account inside the wrapper. Interest is tax-free. It behaves like any savings account otherwise — fixed or variable rate, notice or instant access.
3. Understand a stocks and shares ISA.Investments inside the wrapper. Returns and gains are sheltered, but the value can fall as well as rise and it is not a savings account. Generally considered for money you will not need for several years.
4. Understand a Lifetime ISA.Designed for a first home or for retirement, with a government bonus on contributions and strict rules — age limits at opening and contribution, a property price cap, and a withdrawal charge if you take money out for anything else. The charge can leave you with less than you put in.
5. Understand a Junior ISA.For a child, with its own separate allowance. The money becomes the child's and is generally locked until they reach adulthood, at which point they control it.
6. Check whether personal savings allowances make an ISA unnecessary.Separately from ISAs, there is a personal savings allowance for interest outside a wrapper, which varies by tax band. For some savers a normal account paying a better rate is more valuable. Check the current allowance on GOV.UK.
7. Compare the underlying rate, not the label.A cash ISA paying less than a normal savings account can leave you worse off once your personal savings allowance is taken into account.
8. Always use the transfer process.To move an ISA, ask the new provider to transfer it. Withdrawing the money yourself removes it from the wrapper and can use up allowance to put it back.
9. Check whether the ISA is flexible.Some cash ISAs allow you to withdraw and replace money in the same tax year without it counting again against the allowance. Not all do, and the difference matters.
10. Keep the paperwork.Provider, account number and opening date for each. It is the information you need for transfers and for tracing accounts later.

Tips

• Never withdraw to transfer. Ask the receiving provider to do a formal ISA transfer — it preserves the tax treatment and your allowance.
• Check the Lifetime ISA withdrawal rules carefully before contributing. The charge for taking money out for the wrong purpose can leave you with less than you paid in.
• A tax wrapper is worth nothing if the rate inside it is poor. Compare the rate first, then consider the wrapper.

Common mistakes

• Assuming an ISA always beats a normal savings account — The personal savings allowance means many savers pay no tax on interest anyway, so a higher rate outside a wrapper can be worth more.
• Treating a stocks and shares ISA as savings — It holds investments, so the value can fall. It is a different risk profile from a cash ISA despite the shared name.

If it doesn't work

Questions people ask