How a Junior SIPP works
A Junior SIPP is a pension you open and manage for a child until they turn 18, when control passes to them (though they can't access the money until the normal minimum pension age). The headline draw is tax relief even though the child pays no tax: contribute up to £2,880 a year and the government tops it up to £3,600.
Best Junior SIPP providers
| Provider | Platform fee | Fund dealing | Minimum |
|---|---|---|---|
| AJ Bell | 0.25% | £1.50 funds | £25/mo or £500 |
| Fidelity | 0.35% (capped under £25k) | Free on funds | £25/mo |
| Hargreaves Lansdown | 0.45% | Free on funds | £25/mo or £100 |
| Interactive Investor | Included in family plan | Per their plan | £25/mo |
The power of starting early
Time is the real advantage. £2,880 contributed (£3,600 with tax relief) every year from birth to age 18, then left untouched until age 60, could grow into a very large sum thanks to decades of compounding — even with no further contributions after 18. Starting at birth versus age 18 can roughly double the eventual pot.
What to consider
- Lock-in: the child can't touch the money until the minimum pension age, far longer than a Junior ISA.
- Control transfer: at 18 they become the legal owner and can change investments or stop contributions.
- Investment choice: a global index fund is a common, low-cost long-term holding.
Compare with adult plans in our best pension UK and best SIPP providers guides.
Junior SIPP vs Junior ISA
Families often weigh a Junior SIPP against a Junior ISA, and the two serve different goals. A Junior ISA can be accessed at 18, making it suited to university costs or a house deposit, but it gets no tax relief on the way in. A Junior SIPP is locked until pension age, currently set to reach 57 by 2028, but the government adds 25% relief to every contribution. Many parents use the ISA for nearer-term needs and the SIPP purely as a long-horizon gift that benefits most from decades of compounding.
Why time is the decisive factor
The maths behind a Junior SIPP is striking precisely because of how long the money stays invested. A pound contributed at birth has around 60 years to compound before pension age, versus roughly 40 for a contribution made at 18. That extra two decades can more than double the eventual value of the same contribution. Even modest, consistent payments while a child is young can therefore outweigh much larger contributions made later, which is why starting early matters more than the amount.
Choosing investments for a 50-year horizon
With such a long timeline, most parents opt for a high-equity portfolio, commonly a single low-cost global index fund that spreads risk across thousands of companies worldwide. Short-term volatility is irrelevant when the money cannot be touched for decades, so there is rarely a case for holding bonds or cash in a young child's SIPP. As the child approaches adulthood and takes control, they can reassess the mix to suit their own plans.
Practical points for parents and grandparents
- All contributions from any adult count towards the same £2,880 net annual limit per child.
- The account must be opened by a parent or guardian, but anyone can pay in afterwards.
- At 18 the child becomes the legal owner and can change or stop the investments.
- The money still can't be withdrawn until the minimum pension age, protecting it for the long term.
See how early contributions snowball using our pension calculator.
A long-term gift worth considering
A Junior SIPP is one of the most powerful financial gifts an adult can make to a child, precisely because the money has so long to compound and benefits from tax relief the child couldn't otherwise claim. It is not the right tool for every family — money locked away for over five decades is no help with university fees or a first home, which is where a Junior ISA fits. But used alongside other savings, a small annual contribution to a Junior SIPP can quietly set a child up for a far more secure retirement than they could easily build themselves. The discipline of starting early, even with modest sums, matters more than the amount. Choose a low-cost provider, hold a simple global equity fund, and let time do the heavy lifting. By the time the child reaches adulthood and takes control of the account, decades of compounding will already have done work that no later contribution could replicate.
Verdict
AJ Bell offers the best blend of low fees and broad choice, while Fidelity's capped fee and free fund dealing make it cheapest for smaller pots. Either is an excellent vehicle for a very long-term, tax-relieved gift.