ISA Allowance Is Dropping to £12,000 in April 2027: Should You Max Out Now?

The current ISA allowance is £20,000 per tax year — and it's been at this level since 2017/18. But from April 2027, this allowance will fall to £12,000 for most savers (those under 65). People aged 65 and over will keep a £20,000 allowance.

That means 2026/27 (the current tax year, running until 5 April 2027) is the last year most UK adults can put up to £20,000 into an ISA tax-free. If you have the capacity to save, this is a meaningful deadline worth planning around.

What Is an ISA, and Why Does the Allowance Matter?

An Individual Savings Account (ISA) lets you save or invest money and pay no UK tax on interest, dividends or capital gains on whatever's inside it. The £20,000 allowance is the maximum you can add in a single tax year — any amount below that limit that you don't use is gone forever; you can't carry unused allowance forward.

The reduction to £12,000 in April 2027 means savers who regularly fill their ISA will lose £8,000 of annual tax-free capacity. For a higher-rate taxpayer earning 4.5% on savings, £8,000 less in an ISA costs approximately £144 per year in additional tax — not enormous, but real.

Current Best ISA Rates (June 2026)

Easy-Access Cash ISA (source: MoneyfactsCompare)

• Trading 212: 4.76% AER (includes 12-month bonus)
• Moneybox: 4.75% AER (includes bonus)

Fixed-Rate Cash ISA (source: MoneyfactsCompare)

• Isbank (via Meteor Savings): 4.75% AER (1-year and 2-year)
• Castle Trust Bank: 4.72% AER (5-year fix)

Stocks and Shares ISA: Returns depend on underlying investments. The FTSE 100 trades at ~10,364 as of June 2026.

Cash ISA vs Stocks and Shares ISA

For money you're likely to need within five years, a Cash ISA at ~4.7% is reasonable — particularly with the Bank of England Base Rate currently at 3.75%. For money you won't need for at least five to ten years, a Stocks and Shares ISA has historically outperformed cash over the long term, though with more short-term volatility.

How Does the UK Compare?

• US: The equivalent (Roth IRA) has an annual contribution limit of $7,000 (~£5,500), with no direct analogue to the UK ISA's simplicity. The ISA is more generous.
• France: Livret A savings (tax-free) have a cap of €22,950 (~£19,500) — broadly comparable but with a fixed rate set by the government (currently 2.4%).
• Germany: No direct equivalent — investment income is taxed at a flat 25% (Abgeltungsteuer), making the UK ISA's tax-free status relatively advantageous.

What to Do Before April 2027

You don't need to act urgently today — the current tax year runs until 5 April 2027. But if you're likely to have £20,000 available to save or invest this year, prioritising ISA contributions before the allowance drops makes sense. Open an account early in the tax year and contribute regularly to spread the decision across time rather than scrambling in March.

Key Numbers

• Current ISA allowance (2026/27): £20,000
• New allowance from April 2027: £12,000 (under 65s)
• Best easy-access cash ISA rate: 4.76% AER (June 2026)
• Bank of England Base Rate: 3.75%

Sources

• Top Cash ISAs 2026/27 — MoneySavingExpert
• Highest UK Cash ISA Rates — MoneyfactsCompare
• Highest Fixed ISA Rates — MoneyfactsCompare
• Best Cash ISA Rates UK 2026 — Boring Money
• Bank of England Monetary Policy Summary, June 2026

Educational content only — not financial advice. ISA rules and rates change — check current terms directly with providers.