What Is a Junior ISA and How to Invest for Your Children

Why Investing for Your Children Makes Sense

The earlier money is invested, the more time it has to compound. Nowhere is this more apparent than when investing for children. A child born today has potentially 18 years before they can access a Junior ISA, and decades more before typical financial goals like a house deposit or retirement savings come into focus. Starting early can make an extraordinary difference to a young adult's financial position.

What Is a Junior ISA?

A Junior ISA — JISA — is a tax-efficient savings account available for children under 18 who are resident in the UK. Like the adult Stocks and Shares ISA, all growth, dividends, and interest within a JISA are completely free from UK tax. The annual contribution limit for 2024/25 is £9,000 per child. Once the child turns 18, the Junior ISA automatically converts to a standard adult ISA and the child gains full control of the funds.

Two Types of Junior ISA

There are two varieties of Junior ISA. The Cash Junior ISA earns interest on savings tax-free — similar to a regular savings account but without tax on the interest. The Stocks and Shares Junior ISA allows the money to be invested in funds, ETFs, shares, and bonds — exactly like an adult Stocks and Shares ISA. For most parents with an 18-year investment horizon for their child's money, a Stocks and Shares Junior ISA is almost always the better choice, as the long time horizon allows for greater risk-taking and the potential for significantly higher returns than cash savings.

Who Can Open a Junior ISA?

A Junior ISA must be opened by a parent or legal guardian. Only parents or guardians can manage the account until the child is 16. From age 16, the child can manage the account themselves but cannot withdraw from it until they turn 18. Importantly, children born between 1 September 2002 and 2 January 2011 may have a Child Trust Fund — a predecessor to the JISA — and cannot also hold a JISA unless the Child Trust Fund is first transferred to a JISA.

How Much Should You Contribute?

Even modest regular contributions can grow substantially over 18 years. Investing £100 per month from birth at an assumed 7 per cent annual return would grow to approximately £42,000 by the child's 18th birthday. Investing the full £9,000 annual allowance each year — £750 per month — at the same return rate would produce a portfolio of approximately £378,000 by age 18. Even if the full allowance is beyond your means, any regular contribution, however small, gets the compounding started.

Which Platforms Offer Junior ISAs?

Several major UK platforms offer Stocks and Shares Junior ISAs. Hargreaves Lansdown provides access to the full range of their investments within a JISA. Vanguard UK offers a low-cost JISA with their range of index funds at a platform fee of 0.15 per cent capped at £375. AJ Bell offers a JISA with competitive fees. Fidelity and OneFamily also offer dedicated JISA products. For simplicity and low cost, Vanguard's JISA is often the recommended starting point for parents who want a simple index fund approach.

What to Invest In Within a Junior ISA

With an 18-year horizon, most financial experts recommend a high equity allocation within a Junior ISA — 80 to 100 per cent in global equity index funds. The Vanguard FTSE All-World ETF or a LifeStrategy 100 per cent Equity Fund are common choices. Given the very long time horizon, short-term market volatility is not a concern. Gradually shifting to a more balanced portfolio in the few years before the child turns 18 — if the money will be needed soon after they gain access — is prudent.

Teaching Children About Money

Beyond the financial benefits, a Junior ISA can be a powerful teaching tool. Showing older children their Junior ISA balance, explaining how the investments work, and tracking growth together can instil a healthy attitude towards saving and investing from a young age. The financial education that comes with seeing compound growth in action is arguably as valuable as the investment itself.