UK ISA Guide 2025/26 | Types, Rules & Which ISA Is Best

Q: What is the ISA allowance for 2025/26?

The annual ISA allowance for 2025/26 is £20,000. This is the maximum you can pay into ISAs in a single tax year (6 April to 5 April). You can split this across multiple ISA types — for example, £10,000 in a Cash ISA and £10,000 in a Stocks and Shares ISA — as long as the combined total does not exceed £20,000. Unused allowance cannot be carried forward to the next tax year.

Q: How does the Lifetime ISA work?

The Lifetime ISA (LISA) allows you to save up to £4,000 a year and receive a 25% government bonus — up to £1,000 per year. You must be aged 18–39 to open one. You can use the money to buy your first home (worth up to £450,000) or access it from age 60. Withdrawing for any other reason incurs a 25% government penalty, which effectively costs you more than the bonus you received. The LISA counts towards your £20,000 annual ISA allowance.

Q: What is a Junior ISA?

A Junior ISA (JISA) is a tax-free savings account for children under 18. The annual JISA allowance for 2025/26 is £9,000. Parents or guardians can open and manage the account, and family members can contribute up to the annual limit. The child cannot access the money until they turn 18, at which point it automatically converts to an adult ISA. Junior ISAs can be Cash or Stocks and Shares, and any provider-set interest or returns are completely tax-free.

Q: Is it better to use an ISA or a pension?

For retirement savings, pensions are usually more tax-efficient for higher rate taxpayers because contributions attract tax relief at your marginal rate (40% or 45%), and employers can contribute too. ISAs have no tax relief on contributions but withdrawals are completely tax-free, with no restrictions on when or how much you access. A common strategy is to maximise pension contributions first (especially to capture employer matching), then use an ISA for additional savings or goals that precede retirement, such as a house deposit or early retirement bridge.

Q: What happens to my ISA if I die?

If you die, your ISA loses its tax-free status on death — the funds become part of your estate and are potentially subject to inheritance tax. However, a surviving spouse or civil partner can inherit an Additional Permitted Subscription (APS) equal to the value of your ISA, allowing them to shelter an equivalent amount in their own ISA without using their £20,000 annual allowance.

ISA allowances at a glance

ISA type	Annual limit	Who can open	Key benefit
Cash ISA	£20,000	18+	Tax-free interest
Stocks & Shares ISA	£20,000	18+	Tax-free growth & dividends
Innovative Finance ISA	£20,000	18+	Tax-free P2P interest
Lifetime ISA (LISA)	£4,000	18–39	25% government bonus (up to £1,000/yr)
Junior ISA (JISA)	£9,000	Under 18	Tax-free growth, locked until 18

The overall adult ISA allowance is £20,000 per tax year. The LISA's £4,000 limit counts within this. You can split the allowance across ISA types as you like — but the combined total must not exceed £20,000. Unused allowance is lost at the end of each tax year.

Project your ISA growth → ISA Calculator Help to Buy ISA bonus → Calculator

Cash ISA

A Cash ISA works like a standard savings account, but any interest you earn is completely free from income tax. This used to be a major advantage for everyone, but since the introduction of the personal savings allowance (PSA) in 2016, basic rate taxpayers can earn up to £1,000 in interest tax-free outside an ISA anyway (£500 for higher rate taxpayers, nil for additional rate).

For most basic rate taxpayers with modest savings, a Cash ISA now competes against non-ISA savings accounts on pure rate. The ISA advantage remains meaningful if:

You are a higher rate taxpayer (£500 PSA is quickly exceeded with larger balances)
You are an additional rate taxpayer (no PSA at all)
You expect to accumulate a large balance over many years — protecting it now means future interest on the whole balance is sheltered forever
Your savings interest regularly approaches or exceeds the PSA

From April 2024, you can open multiple Cash ISAs with different providers in a single tax year — something that was not previously possible. You can also make partial transfers between providers without losing your tax-free status.

Stocks & Shares ISA

A Stocks and Shares ISA holds investments — funds, shares, bonds, investment trusts — and shelters all returns (growth, dividends, and income) from income tax and capital gains tax. This is where the ISA wrapper becomes most powerful, particularly for long-term investors.

Outside an ISA, a basic rate taxpayer pays 18% CGT on gains above £3,000 per year, and dividend tax at 8.75% on dividends above the £500 dividend allowance. A higher rate taxpayer pays 24% CGT and 33.75% on dividends. Inside an ISA, all of this is zero.

The long-term advantage: Someone contributing £20,000 per year for 20 years at 7% annual growth accumulates roughly £820,000 inside a Stocks and Shares ISA — completely tax-free. Held outside an ISA, the same scenario would generate significant CGT and dividend tax bills each year, meaningfully reducing the end balance. Use the ISA Calculator to model your own numbers.

The main risk is that investments can fall in value. A Stocks and Shares ISA is generally only appropriate for money you will not need for at least 5 years, to allow time to recover from short-term market falls.

Lifetime ISA

The Lifetime ISA (LISA) is the standout option for two specific goals: buying your first home or saving for retirement. It pays a 25% government bonus on up to £4,000 per year — up to £1,000 in bonus per year. You must be between 18 and 39 to open one.

Using a LISA for a first home

You can use LISA savings (plus the bonus) to buy a first home worth up to £450,000. The property must be bought with a mortgage — the LISA cannot be used for cash purchases. You must have held the LISA for at least 12 months before using it. The LISA cannot be used alongside a Help to Buy ISA bonus on the same purchase (you must choose one).

Using a LISA for retirement

You can access LISA savings penalty-free from age 60. Combined with a pension, a LISA can top up retirement income. Unlike a pension, LISA withdrawals are completely tax-free — there is no income tax on money you take out. The downside compared to a pension is no employer contribution and no tax relief on contributions (the 25% bonus is equivalent to basic rate relief, but not higher rate).

The LISA penalty

Withdrawing from a LISA for any other reason — including if you are terminally ill and under 60, or buying a home worth over £450,000 — incurs a 25% government charge. This is applied to the full withdrawal amount, not just the bonus, meaning you can receive back less than you paid in. From April 2021 the charge was reduced from 25% to 20% (reverting in April 2025 back to 25%). Always check current rules before withdrawing.

Junior ISA

A Junior ISA (JISA) is opened by a parent or guardian for a child under 18. The annual allowance is £9,000. The money is locked in until the child turns 18, when it converts automatically to an adult ISA. Grandparents and other family members can contribute, but the total from all sources must not exceed £9,000 in the tax year.

JISAs can be Cash or Stocks and Shares. Given the long time horizon (potentially 18 years), a Stocks and Shares JISA has historically outperformed Cash over this timeframe, though with more short-term volatility. Many providers allow you to hold both a Cash JISA and a Stocks and Shares JISA for the same child, splitting contributions between them.

The Flexible ISA

Some providers offer "flexible" ISAs that allow you to withdraw money and replace it in the same tax year without the replacement counting against your annual allowance. For example, if you deposit £20,000 then withdraw £5,000, a flexible ISA lets you put the £5,000 back without it counting as a new £5,000 subscription. Not all ISAs are flexible — check with your provider.

ISA vs pension — which comes first?

For retirement savings, the general hierarchy is:

First: Contribute enough to your workplace pension to capture the full employer match — this is free money and always worth taking
Second: If you are a higher rate taxpayer, maximise pension contributions within the annual allowance — 40% tax relief is highly valuable
Third: Use a Stocks and Shares ISA for additional long-term savings, bridging funds for early retirement, or money you may need before pension age
Consider a LISA if you are 18–39, haven't bought a home, and want an extra boost for a first home purchase or retirement

ISAs are better than pensions for money you might need before age 57, or if you are a basic rate taxpayer and expect to remain one in retirement (reducing the pension tax-relief advantage). For most people building long-term wealth, ISAs and pensions work best together.

Frequently asked questions

What is the ISA allowance for 2025/26?

The annual ISA allowance for 2025/26 is £20,000. You can split this across multiple ISA types — for example, £10,000 in a Cash ISA and £10,000 in a Stocks and Shares ISA — as long as the total does not exceed £20,000. The LISA's £4,000 limit counts within this. Unused allowance cannot be carried forward.

What is the difference between a Cash ISA and a Stocks and Shares ISA?

A Cash ISA works like a savings account where your money earns interest, shielded from income tax. A Stocks and Shares ISA invests your money in shares, funds, or bonds — potential returns are higher over the long term, but so is the risk. For money you need within the next 3–5 years, Cash ISAs are typically more appropriate. For longer-term goals, a Stocks and Shares ISA has historically offered better returns.

How does the Lifetime ISA work?

The LISA allows you to save up to £4,000 a year and receive a 25% government bonus — up to £1,000 per year. You must be aged 18–39 to open one. You can use the money to buy your first home (up to £450,000) or access it from age 60. Withdrawing for any other reason incurs a 25% government charge. The LISA counts towards your £20,000 annual ISA allowance.

Can I have more than one ISA?

Yes. From 6 April 2024, you can open and pay into multiple ISAs of the same type in a single tax year — for example, two Cash ISAs with different providers. You can hold as many ISAs as you like across your lifetime; the £20,000 limit only applies to what you pay in each year.

What is a Junior ISA?

A Junior ISA is a tax-free savings account for children under 18. The annual JISA allowance for 2025/26 is £9,000. The child cannot access the money until they turn 18, at which point it automatically converts to an adult ISA. Junior ISAs can be Cash or Stocks and Shares.

Is it better to use an ISA or a pension?

For retirement savings, pensions usually offer better tax efficiency for higher rate taxpayers because contributions attract 40% tax relief. ISAs have no tax relief on contributions but withdrawals are completely tax-free with no access restrictions. The best approach for most people is to maximise employer pension matching first, then use ISAs for additional savings — especially for goals before pension age.

Can I transfer my ISA to a different provider?

Yes, you can transfer an ISA to a different provider at any time without losing tax-free status or counting against your allowance. You must use the official ISA transfer process — withdrawing money and redepositing it elsewhere counts as a new subscription. From 2024/25 you can do partial transfers of current-year subscriptions.

What happens to my ISA if I die?

Your ISA loses its tax-free status on death and the funds form part of your estate. However, a surviving spouse or civil partner can inherit an Additional Permitted Subscription (APS) equal to your ISA's value, allowing them to shelter an equivalent amount without using their own £20,000 allowance.