ISA allowance changes 2026/27: What the new £12,000 cash ISA cap means for you

For anyone under 65, understanding these shifts matters. The government has announced a new £12,000 limit on cash ISA contributions, which takes effect from the 2027/28 tax year. This guide explains what is changing, who is affected, and what you might want to think about as these new rules approach.

What is the ISA allowance for 2026/27?

The ISA allowance for 2026/27, which runs from 6 April 2026 to 5 April 2027, remains at £20,000 per person. This is the total amount you can contribute across all ISA types during the tax year.

This £20,000 limit has remained unchanged since the 2017/18 tax year. You can split your allowance across different ISA types however you wish, provided you don’t exceed the overall cap and stay within any specific limits that apply to certain ISA types.

For example, you could place the entire £20,000 into a cash ISA or divide it between a cash ISA and a stocks and shares ISA, or use any other combination of qualifying ISA products. The Lifetime ISA has its own separate annual limit of £4,000, which counts towards the overall £20,000 allowance.

The 2026/27 tax year is notable because it represents the final year in which savers under 65 can place the full £20,000 into a cash ISA if they choose to do so.

Key changes coming in April 2027

The new £12,000 cash ISA limit for under-65s

From 6 April 2027, the start of the 2027/28 tax year, the government is introducing a new restriction on cash ISA contributions for those under 65 years of age. The maximum you can contribute to a cash ISA will be capped at £12,000 per tax year.

This represents a 40% reduction in the amount of cash ISA allowance available to younger savers compared to the current rules. The stated policy intention is to encourage savers to consider investment-based ISAs for longer-term wealth building.

The change does not affect money already held within cash ISAs. Existing balances remain protected and continue to grow tax-free. The new limit applies only to fresh contributions made from 6 April 2027 onwards.

How the £20,000 overall ISA allowance works

The overall £20,000 ISA allowance remains unchanged beyond April 2027. What changes is how you can allocate it if you’re under 65.

Here is how the allowance structure will work from the 2027/28 tax year:

If you’re under 65 and wish to use your full £20,000 allowance from April 2027, you’ll need to place at least £8,000 into non-cash ISA options such as stocks and shares ISAs, innovative finance ISAs, or qualifying long-term asset funds.

Long-term asset funds represent a newer category of qualifying ISA investment that the government has confirmed will be eligible holdings within stocks and shares ISAs. These funds invest in illiquid assets such as infrastructure or property and have specific liquidity terms.

Who is affected by the cash ISA cap?

Under-65s: what changes for you

If you’re under 65 years of age on 6 April 2027, the new cash ISA limit applies to you. Your maximum cash ISA contribution for 2027/28 and subsequent tax years will be £12,000.

This affects you regardless of your total savings or how you have used ISAs in the past. The rule applies uniformly to all eligible savers below the age threshold.

The practical impact varies depending on your circumstances:

• If you typically contribute less than £12,000 to cash ISAs annually, the change may have limited immediate effect on your savings habits.

• If you’ve been maximising cash ISA contributions at £20,000, you’ll need to decide whether to reduce your tax-sheltered cash savings or explore other ISA types.

• If you hold existing cash ISAs, those funds remain protected and unaffected by the new rules.

Over-65s: your allowance explained

If you’re 65 or older on 6 April 2027, the new cash ISA limit doesn’t apply to you. You retain the ability to place the full £20,000 annual ISA allowance into a cash ISA if you choose.

The government has excluded older savers from this restriction, recognising that those approaching or in retirement may have different risk tolerances and shorter investment time horizons. For this group, the preference for capital security through cash savings is considered reasonable.

Your age on 6 April at the start of each tax year determines which rules apply to you. If you turn 65 during the 2027/28 tax year but were 64 on 6 April 2027, the £12,000 cash ISA limit would apply for that tax year. You would then qualify for the full cash ISA allowance from the following tax year.

Understanding the different ISA types

Cash ISAs

Cash ISAs function similarly to standard savings accounts, but the interest you earn is tax-free. Cash ISA balances aren’t exposed to market movements like a stocks and shares ISA. Your money is held as a deposit and protection depends on the provider and Financial Services Compensation Scheme (FSCS) cover (limits and eligibility apply).

Cash ISA interest rates vary depending on the provider and product type. Rates can be fixed or variable, and access terms range from instant withdrawal to fixed-term products that may restrict access for one, two, or more years.

The security of cash ISAs comes with a trade-off. Over longer periods, cash savings often struggle to outpace inflation, meaning the real purchasing power of your money may decline even as the nominal balance grows.

Stocks and shares ISAs

Stocks and shares ISAs hold investments such as company shares, bonds, investment funds, and exchange-traded funds. Any growth in value and any income from dividends or interest is sheltered from tax.

The stocks and shares ISA allowance remains at £20,000, both now and after April 2027. For under-65s who wish to maximise their tax-sheltered savings from 2027/28, investment ISAs become a more significant consideration.

The value of investments held in a stocks and shares ISA can fall as well as rise. You may get back less than you originally invested. This contrasts directly with cash ISAs, where your deposited capital is protected. Investment ISAs are generally considered more suitable for those with longer time horizons who can tolerate short-term fluctuations in value.

Innovative finance ISAs and lifetime ISAs

Innovative finance ISAs hold peer-to-peer lending investments. You effectively lend money to individuals or businesses through a platform, earning interest on the loans. Your capital is at risk because borrowers may default. These products carry different risks than traditional investments and are not covered by the FSCS in the same way as cash deposits.

Lifetime ISAs serve a specific purpose: saving for a first home or for retirement after age 60. You can contribute up to £4,000 per year if you’re between 18 and 39 years of age. The government adds a 25% bonus to your contributions, up to £1,000 per year.

Withdrawing from a Lifetime ISA for purposes other than a first home purchase or retirement typically incurs a 25% penalty on the amount withdrawn, which means you could get back less than you put in.

Practical considerations for the 2026/27 tax year

The 2026/27 tax year presents specific considerations depending on your age and savings strategy.

For those under 65 who prefer cash savings, 2026/27 represents the final opportunity to contribute up to £20,000 to a cash ISA. From April 2027, that maximum drops to £12,000.

Some points to consider:

• ISA allowances don’t carry over. Any unused allowance from 2026/27 is lost when the tax year ends on 5 April 2027.

• The new cash ISA rules for 2027 apply to contributions only. Existing cash ISA holdings remain intact and continue earning tax-free interest.

• Transfers between ISA types are possible, though rules vary. Transferring from a cash ISA to a stocks and shares ISA doesn’t count against your annual contribution allowance.

Individual circumstances vary considerably. Your age, income needs, risk tolerance, existing savings, and financial objectives all influence what approach might suit you. Those with complex situations may wish to seek independent financial advice tailored to their specific circumstances.

Important points to consider before April 2027

Several practical matters warrant attention as the new rules approach.

Review your current ISA usage. Understanding how you’ve used your allowances in recent years provides useful context for planning ahead. If you’re consistently contributed less than £12,000 to cash ISAs, the new cap may not directly change your behaviour.

Understand the distinction between cash and investment ISAs. Cash ISAs provide capital security. Stocks and shares ISAs offer potential for growth but involve risk to your capital. The value of investments can fall as well as rise, and you may receive back less than you invested. Neither approach is universally superior; suitability depends on individual circumstances.

Consider your time horizon. Investment-based ISAs are generally considered more appropriate for those who can leave funds untouched for five years or more. Shorter time horizons may leave insufficient time to recover from market downturns.

The £12,000 cash ISA cap applies based on your age on 6 April at the start of each tax year. If you’re approaching 65, the timing may be relevant to your planning.

Be aware of ISA rules regarding contributions. You can contribute to more than one cash ISA per tax year, including cash ISAs opened from previous years. The key is that you can’t invest more than the maximum limit allowed in any single tax year. Similar rules apply to stocks and shares ISAs.