Junior ISAs and Junior SIPPs explained
When families look into saving or investing for a child in the UK, two accounts usually come up: a Junior ISA and a Junior SIPP.
Both are designed to build money in a child’s name. They follow different rules, are accessed at different points in life, and are often used for different purposes.
This guide explains how each account works, what the key differences are, and how families typically approach them.
Nest Egg provides information only and does not offer financial advice.
Junior ISA: an account for early adulthood
A Junior ISA (Individual Savings Account) is a long-term savings or investment account opened for a child.
Who can open it:
A parent or legal guardian.
Who can contribute:
Anyone, including grandparents, relatives, and friends, once the account has been opened.
Annual contribution limit (2025/26):
Up to £9,000 per tax year.
Tax treatment:
Any growth or interest within the account is free from UK income tax and capital gains tax.
Access:
The money belongs to the child. It cannot normally be withdrawn until age 18, when control of the account passes to them.
Types of Junior ISA
There are two main types:
Cash Junior ISA – works like a savings account.
Stocks and Shares Junior ISA – the money is invested.
Many families choose the investment option when saving over many years, as investments have historically provided greater long-term growth than cash savings. However, investments can go up and down in value.
If you are unfamiliar with how investing works over long periods, see our guide on How investing grows over time (coming soon).
Junior SIPP: a pension started early
A Junior SIPP (Self-Invested Personal Pension) is a pension account opened for a child.
Like a Junior ISA:
It must be opened and managed by a parent or legal guardian.
It is held in the child’s name.
The main difference is when the money can be accessed.
A Junior SIPP is designed for retirement. The funds cannot normally be accessed until the minimum pension age. This is currently 55, rising to 57 in 2028, and may increase further in future.
Annual contribution limit (2025/26):
Up to £3,600 per year, including tax relief.
Tax relief:
If £2,880 is paid in, the government currently adds £720, bringing the total invested to £3,600.
Tax treatment:
Investments within the account grow free from UK income tax and capital gains tax.
Because the money may remain invested for many years, families who use a Junior SIPP are often thinking about giving a child an early start on retirement savings.
If you would like to understand how long-term investing works in practice, see our guide on How investing grows over time (coming soon).
Key differences at a glance
| Feature | Junior ISA | Junior SIPP |
|---|---|---|
| Annual limit (2025/26) | £9,000 | £3,600 (including tax relief) |
| Access | Age 18 | Minimum pension age (57 from 2028) |
| Tax relief on contributions | No | Yes (20% top-up) |
| Tax on growth | None | None |
| Control at 18 | Your child can withdraw | Your child manages, but cannot withdraw |
| Typical use | Early adult costs | Retirement savings |
Why some families use one and others use both
There is no single approach.
Some families focus only on a Junior ISA, particularly if they expect the money to help with university costs, housing, or other early adult expenses.
Others also contribute to a Junior SIPP, often in smaller amounts, to begin building retirement savings from an early age.
For some families, the two accounts serve different roles:
A Junior ISA for early adulthood.
A Junior SIPP for later life.
Starting early can also create opportunities for conversations about money as a child grows older. As children approach their teenage years, seeing that an account exists in their name can help introduce ideas about saving, investing, and long-term planning.
Many adults feel they were never formally taught how money works. Beginning early can help make financial awareness part of normal family life, rather than something learned later under pressure.
The right approach depends on individual circumstances and family priorities.
Things families often want to be aware of
Child Trust Funds (CTFs):
Children born between 2002 and 2011 may already have a Child Trust Fund. It is not possible to hold both a CTF and a Junior ISA at the same time, although transfers are usually allowed.
The age 16 rule:
At 16, a child can take over management of their Junior ISA, although withdrawals are still not permitted until 18.
Pension age changes:
The minimum pension age is scheduled to rise and may increase again in future. For a child born today, access to a Junior SIPP is likely to be many years away.
A note on investing
Both Junior ISAs and Junior SIPPs can hold investments.
When money is invested rather than kept in cash, it has the potential to grow over time. However, investments can fall in value as well as rise.
Because these accounts are often held for many decades, families sometimes choose investments with long-term growth in mind.
Understanding how investment growth builds over time can make the idea feel much more familiar.
In our next guide, How Investing Grows Over Time, we walk through simple examples showing how regular monthly contributions can grow over decades, and why starting early can make such a difference.
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