A child SIPP in one paragraph
A child SIPP (junior SIPP) is a self-invested personal pension held in a child's name and managed by a parent or legal guardian until the child turns 18. It follows normal SIPP rules — wide investment choice, tax relief on contributions, no access before pension age — scaled to a child's circumstances: because children have no earnings, tax-relieved contributions are capped at £3,600 gross a year (£2,880 from the payer, £720 added by HMRC). The “self-invested” part matters mainly as breadth of choice — nothing obliges the managing parent to do anything more adventurous than pick one fund and leave it alone, and most do exactly that.
The three roles: who opens, who manages, who pays
Confusion about who does what stops many families before they start. The rules are actually clean:
| Role | Who can do it | Notes |
|---|---|---|
| Open the account | Parent or legal guardian only | Grandparents cannot open one directly, however keen |
| Manage investments | The registered contact (parent/guardian) until 18 | Control passes automatically to the child at 18 |
| Contribute money | Anyone — parents, grandparents, aunts, family friends | Third-party contributions still trigger the child's tax relief |
| Own the money | The child, from the first contribution | Irrevocable — you cannot take it back |
| Withdraw | The child, from pension access age only | 57 from April 2028 under current rules; likely later for today's children |
A grandparent who wants to fund one simply asks the parent to open the account, then contributes to it — the tax and inheritance-tax detail of that route is in grandparents paying into a child's pension.
Contributions and the automatic 25% top-up
Every contribution from any source is treated as the child's own for tax purposes. The provider claims basic-rate relief and adds it to the pot: pay £80 and £100 is invested; pay the full £2,880 in a tax year and the child ends up with £3,600. There is no carry-over — unused headroom in one tax year doesn't roll into the next — so families aiming to maximise the wrapper contribute each April-to-April year. If a teenager starts earning (a part-time job, say), their relief limit becomes 100% of those earnings if higher than £3,600.
What can the money be invested in?
Because it is a genuine SIPP, the investment menu is wide: funds, index trackers, ETFs, investment trusts and shares, depending on platform. In practice most families keep it simple with one or two global equity funds — a defensible choice given the multi-decade horizon, though all investing carries risk and values fall as well as rise. Some providers also offer ready-made portfolios for hands-off parents. Platform charges matter over 50+ years, so compare them — our best junior SIPP guide ranks the options on fees and fund range.
The access-age caveat, stated plainly
Money in a child SIPP is locked away longer than in any other mainstream product. Pension access age is 55 today, rises to 57 on 6 April 2028, and government policy has signalled that it should sit roughly ten years below State Pension age over time. State Pension age itself is 66 now, reaches 67 during 2026–28, with a rise to 68 legislated for 2044–46 — and a child born in 2026 could plausibly face a higher SPA still. So while “access at 57” is correct under current rules, parents should assume today's children will wait until their late 50s at the earliest. If any of the gift might be needed for university, a first home or early adulthood, pair or replace the SIPP with a Junior ISA — the trade-offs are weighed in Junior ISA vs Junior SIPP.
What a modest monthly amount could become
The full £240 a month is beyond many family budgets, but a child SIPP doesn't demand it — several platforms accept small or even no minimum contributions. Suppose £100 a month net is paid from birth until 18 and then stopped. Grossed up to £125 by tax relief and assuming 5% annual growth after charges (an assumption, not a prediction), the pot would reach roughly £44,000 at 18 — and, left invested with nothing further added, around £293,000 by age 57. The family's own outlay: £21,600. Halve the contribution and the outcomes roughly halve; the arithmetic scales linearly, so any sustainable amount buys a proportionate head start.
Charges: the 50-year multiplier
Fee differences that look trivial on an adult timescale are anything but here. Compounded over five decades, an extra 0.5% of annual charge can consume a five-figure slice of the final pot in the examples above. When comparing junior SIPP providers, weigh three costs together — the platform's annual charge, the fund's ongoing charge, and any dealing fees — and check what the platform charges once the pot converts to an adult SIPP at 18, since that's where the account will spend most of its life. The fee structures of the main providers are compared in our best junior SIPP ranking.
What happens at 18 — and what doesn't
On the child's 18th birthday the junior SIPP becomes a standard adult SIPP. Three things change: the child takes over investment decisions, they can contribute themselves, and they can transfer to any provider they like. One thing emphatically does not change: no withdrawals until pension access age. An 18-year-old inheriting control of a £100,000 pot cannot spend a penny of it — which, depending on the 18-year-old, may be precisely the point.
It's worth telling the child about the pot well before then. A teenager who learns that decades of compounding are already working for them tends to treat the handover as a responsibility rather than a windfall — and some are prompted to start contributing from their first pay packet, stacking their own tax relief on top of the family's head start.
For the broader case for starting a pension this early — the compounding arithmetic and the £2,880 rule in context — see our full junior pensions guide. And where a child SIPP forms part of a larger plan to pass wealth down a generation, an FCA-regulated adviser can check it meshes with the rest of the estate.