The different types of ISA explained: a complete guide for UK savers and investors

Key takeaways

• An ISA is a tax wrapper, not an investment. Interest, dividends and gains earned inside an ISA are free of UK income tax and capital gains tax, and you do not need to declare them on a tax return.
• There are five types you can pay into today: cash ISAs, stocks and shares ISAs, Lifetime ISAs, Innovative Finance ISAs and Junior ISAs. Help to Buy ISAs still exist but closed to new savers in 2019.
• For the 2026/27 tax year, the overall adult ISA allowance is £20,000. You can split it across ISA types however you like, within the limits of each product. The Junior ISA limit is £9,000 and the Lifetime ISA limit is £4,000, which counts towards your £20,000.
• Cash ISA limits change from April 2027. From 6 April 2027, savers under 65 will be able to put no more than £12,000 a year into cash ISAs. The overall £20,000 allowance stays the same.
• The allowance is "use it or lose it". Unused allowance does not roll over when the tax year ends on 5 April.
• The right ISA depends on what the money is for and when you will need it. No single type is best for everyone.

What an ISA is, and why it matters

An Individual Savings Account (ISA) is a type of account that HMRC treats differently for tax. Money held in an ISA can grow without income tax on interest or dividends, and without capital gains tax when you sell investments at a profit. When you take money out, you pay no tax on it either.

Many people with modest savings already pay no tax on their interest. That is because of the Personal Savings Allowance, which in recent tax years has been £1,000 of interest for basic-rate taxpayers, £500 for higher-rate taxpayers and nothing for additional-rate taxpayers. So why bother with an ISA?

• Interest rates and balances change. A pot that sits inside your allowance today may not do so if rates rise or your savings grow.
• Other allowances are small. The tax-free dividend allowance and the capital gains tax annual exempt amount were both cut sharply in recent years. In 2025/26 they stood at £500 and £3,000 respectively. Investors with even moderate portfolios outside an ISA can find themselves owing tax.
• Tax rates on investment income are rising. The government has announced increases to the tax rates on dividend income and on savings income over 2026 and 2027. That makes the ISA wrapper more valuable.
• There is no paperwork. ISA income does not go on a self-assessment return.
• The protection lasts for years. Money sheltered in an ISA stays sheltered year after year, for as long as it stays in the wrapper.

Allowances and rates change at fiscal events. Always check the current figures on gov.uk before acting.

The ISA allowance: how the rules work

The annual limit

The tax year runs from 6 April to 5 April. For 2026/27, adults can pay up to £20,000 in total into ISAs. The government has said it intends to keep the overall limit at this level for the rest of the decade, but that could change at any Budget.

The allowance applies to new money you pay in. Growth does not count. If your stocks and shares ISA rises from £20,000 to £25,000, you can still pay in a full fresh allowance the next tax year.

Splitting the allowance

You can spread your allowance across different types of ISA. Since 6 April 2024 you can also open and pay into more than one ISA of the same type in a single tax year. For example, you could hold two cash ISAs with different providers. The exception is the Lifetime ISA: you can pay into only one Lifetime ISA per tax year. Check your provider's terms, as some products set their own restrictions.

Illustrative example: Priya, 30, has £20,000 to put away in 2026/27. She could:

• put £4,000 into a Lifetime ISA,
• put £6,000 into an easy-access cash ISA for emergencies, and
• put £10,000 into a stocks and shares ISA for the long term.

That totals £20,000, so she has used her full allowance. The 25% government bonus on her Lifetime ISA does not count towards the limit.

Age rules

• Cash ISA: age 18 or over (the minimum rose from 16 in April 2024).
• Stocks and shares ISA and Innovative Finance ISA: age 18 or over.
• Lifetime ISA: open between 18 and 39. You can pay in until you turn 50.
• Junior ISA: under 18, opened by a parent or guardian.

You generally need to be UK resident to pay into an ISA. Crown servants posted overseas and their spouses or civil partners are an exception.

Cash ISAs

A cash ISA works like an ordinary savings account, except the interest is tax-free. Your capital does not rise or fall with markets. Deposits with a UK-authorised bank or building society are protected by the Financial Services Compensation Scheme (FSCS) up to the scheme limit per person, per banking licence. That limit was raised in December 2025, so check the FSCS website for the current figure.

Main types

• Easy-access: withdraw when you like. Rates are usually variable and can be cut at any time.
• Notice: you must give a set period of notice, such as 90 days, before withdrawing.
• Fixed-rate: you lock money away for a set term, commonly one to five years, in exchange for a guaranteed rate. Early access may be impossible or may carry an interest penalty.

Flexible ISAs

Some cash ISAs (and some stocks and shares ISAs) are "flexible". With a flexible ISA you can withdraw money and put it back in the same tax year without it using up more of your allowance. Not every provider offers this, so check before relying on it.

Illustrative example: Tom pays £15,000 into a flexible cash ISA in May. In August he withdraws £5,000 for a car repair. In January he puts the £5,000 back. With a flexible ISA, he has still used only £15,000 of his allowance and could add another £5,000 before 5 April. With a non-flexible ISA, the replacement £5,000 would count as a new subscription, and he could add only £0 more.

Who cash ISAs suit

Cash ISAs suit emergency funds and short-term goals, roughly anything you need within about five years. They also suit people who cannot tolerate losses. The trade-off is that over long periods cash has historically tended to lag behind inflation and investments, though past performance is no guide to the future.

Stocks and shares ISAs

A stocks and shares ISA lets you hold investments such as funds, investment trusts, exchange-traded funds (ETFs), individual shares and bonds. Inside the wrapper, dividends, bond interest and capital gains are all tax-free.

Ways to invest

• DIY platform: you choose your own investments from a wide range. This gives the most control and needs the most knowledge.
• Ready-made or managed portfolios: you pick a risk level and the provider builds and rebalances the portfolio for you.
• Robo-advisers: an online questionnaire leads to an automated portfolio. These usually come at lower cost than traditional advice.

Costs to watch

Costs compound just as returns do. Look at:

• the platform fee, either a percentage of your pot or a flat fee,
• fund charges (the ongoing charges figure),
• dealing charges for buying and selling shares, ETFs or trusts, and
• any exit or transfer fees.

Percentage fees often suit smaller pots. Flat fees can work out cheaper as a pot grows.

Risk

The value of investments can fall as well as rise, and you may get back less than you put in. Investing is generally more suitable for money you will not need for at least five years. That gives time to ride out falls, though it does not guarantee you will. FSCS protection for investments covers the failure of a provider. It does not cover losses from investments falling in value.

Illustrative example of the tax benefit: Suppose two investors each hold £60,000 in the same fund, which pays a 3% yield, or £1,800 a year in dividends. One holds it in an ISA, the other in a general investment account. The ISA investor pays no tax. The other uses up the dividend allowance and pays dividend tax on the rest at their marginal dividend rate. They may also owe capital gains tax when they eventually sell. These figures are purely illustrative and do not predict returns.

Lifetime ISAs

The Lifetime ISA (LISA) is designed to help people buy their first home or save for later life.

How it works

• You open one between ages 18 and 39, and can pay in until the day before your 50th birthday.
• You can pay in up to £4,000 per tax year, which counts towards your £20,000 overall allowance.
• The government adds a 25% bonus on what you pay in, worth up to £1,000 a year.
• You can hold cash or stocks and shares inside a LISA, depending on the provider.

When you can withdraw without penalty

• To buy your first home costing up to £450,000. The account must have been open at least 12 months, and the money must be paid via a conveyancer or solicitor.
• From age 60, for any reason.
• If you are terminally ill with less than 12 months to live.

Any other withdrawal triggers a 25% charge on the amount withdrawn. Because of how the maths works, this takes back more than the bonus.

Illustrative example: You pay in £4,000 and receive a £1,000 bonus, giving £5,000. You then withdraw the whole £5,000 for a non-qualifying reason. The 25% charge is £1,250, so you receive £3,750. That is £250 less than you put in, before any growth or interest.

Points to weigh

• The £450,000 cap has not risen since the LISA launched in 2017. In higher-priced areas, particularly London and parts of the South East, many first homes exceed it. If you buy above the cap with LISA money, the penalty applies.
• For retirement, compare it with a workplace pension. If your employer contributes to your pension, opting out or reducing your contributions to fund a LISA usually means losing that employer money. Pensions and LISAs are taxed differently: pension contributions get tax relief going in, while LISA withdrawals after 60 are tax-free coming out.
• A replacement is on the way. The government plans to replace the LISA with a new First Time Buyer ISA, expected from April 2028, and consulted on the design between June and August 2026. The new account is for buying a first home only, with no retirement option. Under the proposals, existing LISAs would not be closed: you could still open one until the replacement launches, and existing holders could keep paying in under the current rules. The new account's bonus rate, contribution limit and house-price cap have not yet been announced, so check gov.uk for updates.

Innovative Finance ISAs

An Innovative Finance ISA (IFISA) holds peer-to-peer loans, crowdfunding debentures and certain other alternative investments. Returns are paid as tax-free interest.

These are higher-risk products:

• Borrowers can default, and you can lose some or all of your money.
• Your money may be tied up, and selling early may be slow or impossible.
• Losses from defaults are generally not covered by the FSCS.
• The peer-to-peer sector has shrunk considerably, and several well-known platforms have closed to new investors or wound down.

IFISAs are a niche option. Most people considering one will treat it, if at all, as a small part of a wider portfolio and only after reading the platform's risk warnings carefully.

Junior ISAs

A Junior ISA (JISA) is a tax-free savings or investment account for a child under 18 who lives in the UK.

• A parent or legal guardian opens it, but anyone can pay in, including grandparents and friends.
• The limit is £9,000 per tax year in 2026/27. This is separate from the adult's own £20,000 allowance.
• A child can have one cash JISA and one stocks and shares JISA at the same time.
• The money belongs to the child. It cannot be withdrawn before 18, except in limited circumstances such as terminal illness.
• At 18, the account becomes an adult ISA in the child's name, and they control it.

Children who had a Child Trust Fund can transfer it into a JISA. If you think a child, or you yourself as a young adult, may have a forgotten Child Trust Fund, HMRC has a tracing service on gov.uk.

Illustrative example: Grandparents pay £50 a month (£600 a year) into a stocks and shares JISA from birth. That totals £10,800 in contributions by age 18, plus or minus whatever the investments return. Whether it ends up as a deposit fund or something else is the 18-year-old's decision, which some families find a drawback.

Help to Buy ISAs

Help to Buy ISAs closed to new applicants on 30 November 2019. If you already have one:

• you can keep paying in until 30 November 2029,
• you must claim the bonus by 1 December 2030, and
• you can transfer it to a LISA. Get the transfer rules right, as the treatment of the bonuses differs, and you cannot use both bonuses on the same property purchase.

Changes on the horizon

ISA rules are changing again. From 6 April 2027, the amount savers under 65 can pay into cash ISAs each year will fall to £12,000. The overall £20,000 limit stays the same, so anyone under 65 who wants to use their full allowance will need to put the remaining £8,000 into a stocks and shares, Innovative Finance or Lifetime ISA. People aged 65 and over keep the ability to put their full £20,000 into cash.

The lower limit applies only to new money paid in from April 2027. Money already in a cash ISA stays tax-free.

The government has also confirmed rules to stop people getting around the cash limit. From the same date:

• savers under 65 will not be able to transfer money from a stocks and shares ISA or an Innovative Finance ISA into a cash ISA (transfers the other way are still allowed), and
• interest paid on uninvested cash held inside a stocks and shares ISA or other non-cash ISA will face a 22% charge, whatever your age.

None of this affects the current 2026/27 tax year. The cash limit for this tax year is the full £20,000, and it is the last full tax year in which savers under 65 can put the whole allowance into cash. If you save heavily into cash, it is worth planning for the change now.

The Autumn Budget on 28 October 2026 may bring further announcements, including details of the Lifetime ISA's replacement. Check gov.uk for the latest position.

Transferring ISAs

You can move ISAs between providers, for example to get a better rate or lower fees.

• Always use the official transfer process. Ask your new provider to arrange it. If you withdraw the money yourself and redeposit it, it counts as a new subscription and may lose its ISA status.
• Money paid in during previous tax years can generally be transferred in whole or in part.
• Money paid in during the current tax year can now be partially transferred, a change introduced in April 2024. Some providers still require you to move the whole current-year amount, so check.
• Check for exit penalties, particularly on fixed-rate cash ISAs, and for time out of the market when moving investments as cash.

What happens to an ISA when you die

When an ISA holder dies, the account can keep its tax-free status as a "continuing account of a deceased investor". This lasts until the estate is administered, or for a maximum period set by HMRC. ISAs do form part of your estate for inheritance tax purposes.

A surviving spouse or civil partner can also claim an additional permitted subscription. This is an extra one-off ISA allowance equal to the value of the deceased's ISAs. It lets them keep the savings in a tax-free wrapper. Time limits apply, so check with the provider and on gov.uk.

Common mistakes to avoid

1. Leaving it until the last days of the tax year. Transfers and new accounts can take time. Missing 5 April means that year's allowance is gone for good.
2. Withdrawing to switch providers. This is the classic way to lose ISA status on your savings. Always use a formal transfer.
3. Overpaying the allowance. If you go over £20,000, or pay into two LISAs in one year, HMRC may contact you and the excess may lose its tax-free treatment. Keep a simple record of what you have paid in across all providers.
4. Assuming every ISA is flexible. Taking money out of a non-flexible ISA and putting it back uses up more allowance.
5. Treating a LISA like a savings account. The 25% withdrawal charge can leave you with less than you paid in. Also check that your likely property price will fall under the £450,000 cap.
6. Dropping workplace pension contributions to fund a LISA. You may lose employer contributions that are hard to beat.
7. Investing money you need soon. Short-term money exposed to market falls can force you to sell at a loss.
8. Ignoring charges. A difference of half a percentage point a year can add up to a lot over decades.
9. Leaving cash idle in a stocks and shares ISA. Uninvested cash may earn little, and from April 2027 any interest paid on it will face a 22% charge.
10. Forgetting old ISAs. Old accounts may be earning very low rates. A periodic review, and consolidating where sensible, can help.

Next steps

• Work out what each pot of money is for, whether that is emergencies, a home deposit, retirement or a child's future, and when you will need it. That points you towards cash, investments, a LISA or a JISA.
• List your existing ISAs and how much you have paid in during 2026/27, so you know how much allowance remains before 5 April 2027.
• Compare rates and fees across providers. Check whether cash ISAs are flexible and what exit penalties apply.
• Think ahead to April 2027 if you are under 65 and save mainly into cash. 2026/27 is your last full tax year to put the whole £20,000 into a cash ISA.
• Check official sources. gov.uk has HMRC's ISA guidance, and moneyhelper.org.uk offers free, impartial guidance.
• Consider regulated advice if your situation is complex, for example if you are balancing pensions, property and investments. You can check a firm is authorised on the FCA register at fca.org.uk.

This article reflects the rules as at 15 October 2026. It is general information only and is not personal financial advice. Tax treatment depends on your individual circumstances and may change in future. The value of investments can fall as well as rise.