ISA Guide 2026/27: Cash ISA, Stocks and Shares ISA, and Lifetime ISA

ISA Guide 2026/27: Everything You Need to Know

Individual Savings Accounts (ISAs) allow you to save and invest free of income tax and capital gains tax — permanently. Any interest, dividends, or gains earned within an ISA are never taxed, regardless of how much the investment grows. For long-term investors and savers, the ISA wrapper can shield hundreds of thousands of pounds from tax over a lifetime.

ISA Allowance 2026/27

Annual ISA allowance: £20,000 per person (unchanged since 2017/18).

The allowance applies per tax year (6 April to 5 April), resets annually, and is strictly use-it-or-lose-it. Unused allowance from previous years cannot be carried forward.

Since April 2024, you can contribute to multiple ISAs of the same type in a single tax year — spreading contributions across different providers is now permitted.

Types of ISA

Cash ISA: The Safe Option

Cash ISA rates in 2026/27 range from approximately 3.5%–5.0% for easy-access accounts, with fixed-term ISAs offering up to 5.5% for 1–2 year fixes. Basic rate taxpayers can hold up to £20,000 in non-ISA savings before the Personal Savings Allowance runs out (£1,000 for basic rate), so the ISA wrapper adds most value for:

• Higher earners (£500 PSA only)
• Additional rate taxpayers (no PSA)
• Anyone accumulating significant cash savings over time

Stocks and Shares ISA: Long-Term Wealth Building

A Stocks and Shares ISA allows investment in individual shares, funds, ETFs, investment trusts, and bonds — all within a tax-free wrapper.

The compound growth advantage:

None of this growth is subject to capital gains tax or income tax within the ISA wrapper.

Index fund vs active management:

A 1% fee difference on £100,000 over 30 years at 7% growth costs approximately £93,000 in lost returns.

Lifetime ISA (LISA): For First Homes or Retirement

The LISA provides a 25% government bonus on contributions — up to £1,000/year.

• Contribute up to £4,000/year (within the £20,000 ISA allowance)
• Government adds 25% (up to £1,000/year) — immediately
• Maximum total bonus over a lifetime: up to £32,000

For first-time property purchases:

• Property must be £450,000 or below
• Must be used with a repayment mortgage
• Must be your first home (never previously owned)

For retirement (from age 60):

• Withdraw tax-free at any time from age 60
• No tax on withdrawals (unlike pension drawdown)

Warning: Withdraw for any other purpose and pay a 25% LISA exit penalty — which is actually 6.25% of your total contributions (because it claws back the bonus, leaving you with less than you put in). Only use a LISA if you are confident it's for first home purchase or retirement.

LISA vs pension for retirement:

• LISA: no tax on contributions; tax-free on withdrawal; access from 60; no employer contribution
• Pension: tax relief on contributions; 25% tax-free lump sum, rest taxable; access from 55 (57 in 2028); employer contribution available

For most employed people, maximise employer pension matching first, then consider LISA as a supplement.

ISA vs Pension: Choosing Between Them

For higher-rate taxpayers, pensions offer superior value (40%+ relief on contributions). ISAs offer superior flexibility. Many people benefit from using both.

Junior ISA 2026/27

Parents and guardians can save up to £9,000/year per child tax-free. The account belongs to the child — they can access it from age 18.

Example: £200/month from birth for 18 years at 6% growth:

• Total contributed: £43,200
• Value at 18: approximately £75,000

Frequently Asked Questions

Q: Can I have more than one ISA? Yes. Since April 2024, you can contribute to multiple ISAs of the same type in a single tax year (previously you were limited to one per type per year). You can still only contribute a total of £20,000 across all ISAs in a tax year.

Q: What happens to an ISA when I die? Your ISA becomes an "APS" (Additional Permitted Subscription) for your spouse or civil partner — they can inherit the ISA allowance in addition to their own. The investment itself forms part of your estate for Inheritance Tax purposes (unlike pensions, which sit outside the estate).

Q: Should I use an ISA or pay off my mortgage? If your mortgage rate exceeds expected investment returns (and for most people it does when rates are 4–5%+), there's a mathematical case for overpaying the mortgage. However, pension contributions with tax relief almost always take priority over both.

Q: What is a "flexible ISA"? Some ISA providers offer flexible ISAs that allow you to withdraw and replace money within the same tax year without affecting your annual allowance. Useful if you temporarily need access to savings.