ISA Guide

An Individual Savings Account (ISA) lets you save or invest money without paying tax on the interest, dividends, or growth. Every UK adult gets an annual ISA allowance — and any unused allowance can't be carried forward, so it's worth understanding your options.

2024/25 ISA allowance: £20,000 per person. You can split this across different ISA types in the same tax year (6 April to 5 April).

Types of ISA

Cash ISA

Works like a regular savings account but interest is always tax-free. Best for short-term savings or an emergency fund. Rates vary — compare on Moneyfacts or MoneySavingExpert.

• Good for: Emergency funds, short-term saving (under 5 years), anyone who pays tax on savings interest
• Maximum: £20,000/year (shared with other ISAs)

Stocks and Shares ISA

Your money is invested in funds, shares, or bonds. Higher potential returns than cash but with risk — your investment can go down as well as up. Best held for 5+ years to ride out market ups and downs.

• Good for: Long-term wealth building, retirement saving alongside a pension
• Maximum: £20,000/year (shared with other ISAs)
• Providers: Vanguard, Hargreaves Lansdown, Moneybox, InvestEngine

Lifetime ISA (LISA)

Designed for two purposes: buying your first home or saving for retirement (after age 60). The government adds a 25% bonus on everything you put in — free money.

	Detail
Who can open one	Age 18–39
Annual contribution limit	£4,000 (counts toward your £20,000 ISA allowance)
Government bonus	25% (max £1,000/year)
Maximum bonus over lifetime	£33,000
First home price limit	£450,000
Early withdrawal penalty	25% (you lose your bonus AND some of your own money)

LISA trap: The 25% withdrawal penalty means you get back less than you put in if you access it for anything other than a first home or retirement. Only open one if you're confident about the purpose.

Junior ISA (JISA)

Tax-free savings for children under 18. Parents or guardians open it but the money belongs to the child and can only be accessed when they turn 18.

• Annual limit: £9,000 (separate from adult ISA allowance)
• Available as cash or stocks and shares

Innovative Finance ISA

Holds peer-to-peer lending investments. Higher risk — your money is not protected by the FSCS. Only for experienced investors who understand the risks.

ISA vs. Regular Savings Account

Since April 2024, basic-rate taxpayers have a Personal Savings Allowance (PSA) of £1,000/year in interest before paying tax. Higher-rate taxpayers get £500. Additional rate taxpayers get nothing.

If your savings interest is below your PSA, a regular savings account may offer better rates than a Cash ISA. An ISA becomes more valuable once you exceed your PSA, or for stocks and shares investing where gains and dividends could otherwise be taxed.

FSCS Protection

Cash ISAs with FCA-regulated banks and building societies are protected up to £85,000 per institution by the Financial Services Compensation Scheme. Stocks and Shares ISAs are also protected (up to £85,000) but this covers the failure of the provider, not investment losses.

How to Open an ISA

Decide which type suits your goal (cash for short-term, S&S for long-term, LISA for first home/retirement).

Compare providers — look at rates for cash ISAs, fees and fund range for S&S ISAs.

Apply online — takes around 10 minutes. You'll need your National Insurance number and bank details.

Set up a regular contribution if you can — even £25/month adds up significantly over time.

Useful Links

MoneyHelper: ISAs

Government-backed guide to all ISA types.

MoneySavingExpert: Best ISA Rates

Up-to-date best buy tables updated regularly.

GOV.UK: ISA Rules

Official rules, limits, and transferring ISAs.