UK JISA vs Junior SIPP (2026/27)
UK JISA vs Junior SIPP 2026/27: the £9,000 Junior ISA limit vs £3,600 gross into a child's pension, tax relief, access ages and a worked comparison.
UK Junior ISA vs Junior SIPP for 2026/27: the £9,000 Junior ISA limit (the child can withdraw from 18) against £3,600 gross a year into a child's pension (locked until minimum pension age), how tax relief works, a worked comparison and the Child Trust Fund rules.
Side-by-side comparison
| Feature | JISA | Junior SIPP |
|---|---|---|
| Annual limit | £9,000 per child | £3,600 gross (£2,880 paid in plus £720 basic-rate relief) where the child has no earnings |
| Tax relief on payments in | None | 20% added by the provider via HMRC |
| Tax on growth | None | None inside the pension |
| Tax on withdrawal | None | Up to 25% normally tax-free; the rest taxed as income |
| Earliest access | 18 (the child can manage it from 16) | Normal minimum pension age: 55 now, 57 from 6 April 2028, so at least 57 for today's children under current law |
| Account types | Cash and/or stocks and shares | Whatever the pension provider offers |
| At 18 | Automatically becomes an adult ISA; the money is the child's | Stays a pension, locked until minimum pension age |
| Risk to weigh | The child can spend it all from 18 | Cannot help with university or a deposit |
Junior ISA rules per GOV.UK. The £2,880 figure for someone with no earnings is from GOV.UK - Tax relief on pension contributions; the £3,600 gross limit is the basic amount in Finance Act 2004 s.190.
Related guides
- UK Saving for Children 2026/27 - bare trust + designated accounts.
- UK SIPP vs Personal Pension 2026/27 - adult SIPP context.
- UK IHT 7-Year Gift Taper 2026/27 - IHT on grandparent gifts.
- ISA Allowance 2026/27 - JISA in wider ISA context.
- Unclaimed Child Trust Funds - tracing a matured CTF for free.
Frequently asked questions
What is a Junior ISA (JISA)?
A tax-free savings or investment account for a child under 18 living in the UK. The limit is £9,000 for 2026/27, across all the child's Junior ISAs. There are cash and stocks and shares Junior ISAs and a child can have one or both. A parent or guardian with parental responsibility opens it for a child under 16; 16 and 17 year olds can open their own. The child can take control at 16 but cannot withdraw until 18, when it automatically becomes an adult ISA. Early access is only allowed if the child is terminally ill.
What is a Junior Self-Invested Personal Pension (SIPP)?
A personal pension set up for a child. A child with no earnings can get tax relief on up to £3,600 gross a year: £2,880 paid in, with £720 of basic-rate relief added by the provider. The money is locked until the normal minimum pension age, which rises from 55 to 57 on 6 April 2028. At retirement up to 25% can normally be taken tax-free and the rest is taxed as income.
How do the long-term values compare?
As an arithmetic illustration with an assumed 5% a year growth (not a forecast): £9,000 a year into a Junior ISA for 18 years (£162,000 paid in) gives about £253,000 at 18. £2,880 a year into a Junior SIPP (£51,840 paid in, £64,800 after relief) gives about £101,000 at 18. Left untouched to age 57, those become about £1,698,000 and £679,000. The Junior ISA figure assumes the money stays invested in an ISA after 18, which is the child's choice; the pension figure is locked.
Why mix a JISA and a Junior SIPP?
They do different jobs. A Junior ISA can pay for university, a first home or other costs from 18, at the child's discretion. A Junior SIPP can only be used for retirement. Some families use both; the maximum into the two together is £12,600 a year (£9,000 Junior ISA plus £3,600 gross pension).
Who can contribute?
Anyone can pay into a Junior ISA, but the total for the child cannot exceed £9,000 a year, however many people contribute. The pension relief limit is also per child. For Inheritance Tax, money paid in by a grandparent or anyone else is a gift to the child. Each giver has a £3,000 annual exemption; gifts of up to £250 per person are exempt if no other allowance is used on the same person; and regular gifts out of surplus income can be exempt under IHTA 1984 s.21 if they leave the giver's standard of living intact.
Can I withdraw early?
From a Junior ISA, no, except where the child is terminally ill (not expected to live more than 6 months). From 18 the money is the child's to withdraw. From a pension, not before the normal minimum pension age except under the ill-health rules, so only commit money that will not be needed before retirement.
What happens to a JISA at 18?
It automatically becomes an adult ISA and the young person can withdraw, keep it invested or transfer it. From then on new payments use the adult £20,000 ISA allowance. You cannot transfer money between a Junior ISA and an adult ISA before 18.
What about Child Trust Funds?
They were for children born between 1 September 2002 and 2 January 2011, and the scheme closed in 2011. A child cannot have both a Child Trust Fund and a Junior ISA, so an existing fund can be transferred into a Junior ISA. Funds mature at 18. The FCA said on 1 September 2026, using HMRC figures, that 760,000 matured accounts averaging £2,000 each are unclaimed. You can trace one free on GOV.UK.