Beginner5 min read

The Four Types of ISA

Cash, Stocks & Shares, Lifetime, and Junior — what each one does, who it suits, and how the allowances interact.

All ISAs share the same fundamental advantage: everything inside them is tax-free. But each type has a different purpose, limit, and set of rules. Here is what you need to know about all four.

1. Cash ISA

A Cash ISA is essentially a savings account where the interest is tax-free. Normally, basic-rate taxpayers can earn up to £1,000 in interest tax-free (the Personal Savings Allowance) and higher-rate taxpayers only £500. If your savings are significant enough to exceed these thresholds, a Cash ISA protects the rest.

  • •Annual limit: £20,000 (shared)
  • •Interest rates vary by provider — shop around
  • •Fixed-rate Cash ISAs can offer higher rates but may lock your money away
  • •FSCS protected up to £85,000 per provider
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If you are a basic-rate taxpayer with modest savings, a regular high-interest savings account may actually pay more than a Cash ISA. Compare rates before committing.

2. Stocks & Shares ISA

The Stocks & Shares ISA is designed for investing. You can hold shares, funds, ETFs, investment trusts, and bonds inside it. All dividends, interest, and capital gains are tax-free — no matter how large your pot grows.

  • •Annual limit: £20,000 (shared)
  • •Wide investment choice depending on provider
  • •No CGT or dividend tax, ever
  • •Best suited for money you can leave invested for 5+ years

For most people building long-term wealth, the Stocks & Shares ISA is the most powerful tool available — especially once your pot grows large enough that the annual gains and dividends would otherwise attract significant tax.

3. Lifetime ISA (LISA)

The Lifetime ISA is the government's most generous deal in personal finance for those who qualify. It pays a 25% bonus on contributions up to £4,000 per year — meaning up to £1,000 per year in free money. But it comes with strict rules.

  • •Annual limit: £4,000 (counts towards your £20,000 ISA allowance)
  • •Government adds 25% bonus (max £1,000/year)
  • •Must be aged 18–39 to open
  • •Can only withdraw penalty-free for a first home (≤ £450,000) or from age 60
  • •25% penalty on any other withdrawal — you lose the bonus and ~6.25% of your own money

4. Junior ISA

The Junior ISA (JISA) is opened and managed by a parent or guardian for a child under 18. The child cannot access the money until their 18th birthday, at which point it automatically converts to an adult ISA in their name.

  • •Annual limit: £9,000 (completely separate from the adult £20,000 allowance)
  • •Available as Cash or Stocks & Shares
  • •Tax-free growth and income
  • •No access until the child turns 18 — no exceptions
  • •Parents, grandparents, and others can all contribute

How the allowances interact

The £20,000 annual allowance is shared between Cash ISA, Stocks & Shares ISA, and Lifetime ISA. The LISA's £4,000 is part of — not in addition to — that £20,000. The Junior ISA's £9,000 is entirely separate.

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Example: You could put £10,000 in a Stocks & Shares ISA, £4,000 in a LISA, and £6,000 in a Cash ISA in the same tax year (total: £20,000). You could also put £9,000 into a Junior ISA for your child on top of that.

This guide is for informational purposes only and does not constitute financial advice. Tax rules can change. Always check current HMRC guidance or consult a qualified financial adviser before making decisions.