Cash ISA cap drops to £12,000 for under-65s in April 2027

From 6 April 2027 the annual cash ISA contribution limit will fall from £20,000 to £12,000 for savers under 65. Over-65s keep the full £20,000 cash ISA limit. The overall £20,000 annual ISA allowance is unchanged — under-65s can still pay the remaining £8,000 into a Stocks & Shares ISA, Innovative Finance ISA or Lifetime ISA (within its own £4,000 sub-cap). The change was announced at the Autumn Budget on 26 November 2025 and applies to new contributions only — existing cash ISA balances are unaffected. Transfers from Stocks & Shares or Innovative Finance ISAs into Cash ISAs will also be banned for under-65s from the same date.

This is the policy in detail and what it means for cash savers between now and April 2027.

What exactly changes on 6 April 2027

The 2025 Autumn Budget introduced two related cash ISA restrictions:

1. Annual cash ISA contribution cap

• Under 65s: maximum £12,000 of new contributions per tax year into cash ISAs (down from £20,000).
• Aged 65 and over: maximum £20,000 retained.
• The overall £20,000 ISA allowance still applies — under-65s can use the remaining £8,000 in any combination of Stocks & Shares ISA, Innovative Finance ISA or Lifetime ISA (with the £4,000 LISA sub-cap).

2. Transfer restrictions

• Under 65s: cannot transfer money from a Stocks & Shares ISA or Innovative Finance ISA into a Cash ISA. This closes a loophole that would otherwise allow under-65s to route around the contribution cap.
• Transfers in the other direction (Cash ISA → Stocks & Shares ISA) remain allowed.
• Transfers between Cash ISAs remain allowed.

What’s NOT changing

• The Junior ISA allowance (£9,000) is unaffected.
• The LISA cap (£4,000 within the £20,000) is unaffected.
• The £20,000 overall ISA allowance is unchanged.
• Existing cash ISA balances built up before April 2027 are unaffected.

Why the government did this

The official rationale published alongside the Budget was that cash ISA savings have grown to a level where the cost to the Exchequer of the tax exemption exceeds the policy benefit — particularly for those who could realistically invest more of the allowance in productive assets. The cap shifts working-age savers toward stocks & shares ISAs (which channel money into investment markets) while retaining flexibility for over-65s, who typically need cash savings for retirement income.

Chartered Institute of Taxation and most major savings industry voices have criticised the change, arguing it’s a stealth disincentive for cautious savers. But it is now law and takes effect 6 April 2027.

What this means in practice

For an under-65 saver who fills the full £20,000 ISA allowance each year:

2025/26 and 2026/27 (current and next tax years)

• Full flexibility: pay all £20,000 into cash ISA, or split.

From 6 April 2027

• Maximum £12,000 cash ISA per year.
• Remaining £8,000 must go into Stocks & Shares ISA, Innovative Finance ISA, or LISA (capped at £4,000).
• If you don’t want equity risk, the £8,000 sits outside the tax wrapper (subject to PSA / income tax on interest).

A worked example for a 40-year-old saver who currently uses £20,000 of cash ISA per year:

• 2026/27: deposits £20,000 into cash ISA. Tax-free interest, no constraint.
• 2027/28: deposits up to £12,000 into cash ISA. For the remaining £8,000 they want to save, they can either:
  • Open a Stocks & Shares ISA and invest (taking on equity risk).
  • Hold £8,000 outside the wrapper in a regular savings account (taxed above PSA).
  • Open a Lifetime ISA if eligible (up to £4,000, with bonus).

Implications for savings strategy in 2025/26 and 2026/27

The change creates a finite window of opportunity. A few tactics being widely discussed in the personal finance press:

1. Maximise cash ISA contributions in 2026/27

The current tax year (2026/27, until 5 April 2027) is the last under-65 opportunity to put £20,000 into a cash ISA in a single year. If you have cash sitting unsheltered that you might otherwise drip-feed into the wrapper, accelerating it before April 2027 captures the full £20,000 allowance.

2. Front-load existing fixed-rate cash ISA contributions

Some longer-duration fixed-rate cash ISAs accept contributions only at opening. Opening one with £20,000 in 2026/27 locks in 5+ years of tax-free interest above the future £12,000 cap.

3. Consider whether equity exposure makes sense

Working-age savers being nudged into Stocks & Shares ISAs face a real decision. Equities can outperform cash over long horizons but with material drawdown risk. For deposit savings with short timelines, stocks may not be appropriate regardless of the ISA cap nudge.

4. Build LISA capacity if you’re eligible

If you’re aged 18–39 and saving for a first home, the LISA’s £4,000 with 25% government bonus continues to be the single best-return product in UK personal finance. The April 2027 changes don’t affect LISA mechanics.

What over-65s should know

If you turn 65 during the 2027/28 tax year, your eligibility for the full £20,000 cash ISA limit depends on your age at the time of contribution. HMRC’s detailed transitional guidance will need to be checked closer to April 2027 — the operational mechanics of the age-65 boundary are not yet fully published. [VERIFY: confirm specific eligibility-on-birthday rules nearer to implementation.]

For over-65s already at retirement, the cash ISA remains a useful inflation-linked tax-free wrapper for emergency funds and shorter-duration cash holdings.

Existing cash ISA balances are safe

A common worry among savers: do balances above £12,000 need to be moved or restructured? No. The change applies only to new contributions from April 2027 onward. Existing balances:

• Stay where they are.
• Continue to earn tax-free interest.
• Can be transferred between cash ISA providers without affecting the new contribution cap.

So a 50-year-old with £80,000 already in cash ISAs from previous years is completely unaffected on the existing balance — they just can’t add more than £12,000/year from April 2027 onward.

What the Spring Statement 2026 didn’t do

The Spring Statement on 3 March 2026 did not introduce any new ISA changes or reverse the Autumn 2025 cash ISA decision. Rachel Reeves explicitly avoided new tax measures at the spring fiscal event. The Autumn Budget 2026 (expected November 2026) is the next fiscal event where further ISA changes could be announced or reversed.

Worked example: 35-year-old high saver

Mia, 35, currently saves £20,000 per year into a cash ISA. She earns £55,000 PAYE.

Through 5 April 2027

• £20,000 into cash ISA — fully utilises the allowance.
• Cumulative balance: ~£100,000+ across her cash ISA history.

From 6 April 2027

• £12,000 into cash ISA.
• Remaining £8,000 — she could:
  • Open a Stocks & Shares ISA, accepting investment risk.
  • Save the £8,000 outside the wrapper at typical 4.5% gross rate. Interest: £360/year. Her PSA covers £500 (basic rate) — wait, at £55,000 she’s higher-rate so PSA is £500. The £360 is within. No tax owed initially.
  • But over multiple years, the unsheltered balance grows. By the time annual interest exceeds £500, tax begins.

If she had instead front-loaded a fixed-rate cash ISA in 2026/27 at £20,000, that balance compounds tax-free indefinitely. Whether the lock-up cost outweighs the tax benefit depends on the fixed rate and her time horizon — but the planning question is real.

Internal links

• How many ISAs can I have at once?
• Can I transfer a cash ISA to a stocks and shares ISA?
• ISA types compared

---

This guide is information, not regulated financial advice. The £12,000 cash ISA cap takes effect 6 April 2027 — verify on gov.uk: Individual Savings Accounts before relying on specific operational details, particularly around the age-65 boundary.