A Junior SIPP lets you contribute up to £2,880 a year into your child's pension — HMRC automatically adds 20% tax relief, topping it up to £3,600. That's £720 of free money every year, locked away until they're 57, growing for decades.
Three things make Junior SIPPs unusually powerful
You contribute up to £2,880 and HMRC adds 20% tax relief automatically, bringing the total to £3,600. This happens even though your child has no income and pays no tax.
£720 free from HMRC on a full contributionA newborn can't access the pension until they're 57. That's potentially 57 years of compound growth on every pound — including the government's contribution. Time is the most powerful variable.
Up to 57 years of tax-free growthFor parents with larger estates, contributing to a child's Junior SIPP moves wealth out of your estate now — while you're alive — into a structure the child cannot access or spend prematurely.
Reduces your taxable estate todayAdjust the sliders to model your child's pension at retirement
Parents or grandparents with surplus cash looking to reduce their estate. Entrepreneurs who've sold a business and want to deploy capital tax-efficiently. Higher earners whose ISA and pension allowances are already maxed. Anyone who wants to give a child a financial foundation that compounds quietly in the background for decades, completely out of reach until it's truly needed.
Einstein reportedly called compound interest the eighth wonder of the world: "He who understands it, earns it; he who doesn't, pays it." A Junior SIPP is perhaps the purest expression of this idea available to a UK investor.
£3,600/year from birth to age 18 — the maximum contribution window — growing at 8% produces a pension pot worth over £2m in nominal terms, from roughly £65,000 of your own money and £16,000 of HMRC's. The rest is time.
At 18 the Junior SIPP converts automatically into a regular SIPP in the child's name — and the story doesn't have to stop there. During any period the grown-up child has little or no earned income (university, further study, travel, early career breaks) a parent or grandparent can continue contributing up to £2,880 a year, still attracting the same 20% government top-up to £3,600. The runway keeps extending, and every extra year at this stage of the compound curve is disproportionately powerful.
The money is locked until retirement — it cannot fund university, a first home, or early career. It's not suitable if you may need the capital back. Junior SIPPs are regulated products; you'll need a broker or platform to open one. Rules on contribution limits and access ages can change.
From April 2027, unused pension pots will form part of a person's estate for IHT. This affects the child's pension when they eventually die — not your contribution now. Your gift into the Junior SIPP is out of your estate today, which remains the key estate planning benefit.