A Junior SIPP is taxed generously at every stage but one. Contributions receive an automatic 20% government top-up, so £2,880 paid in becomes £3,600 in the account. Investment growth inside the pension is free of income tax and capital gains tax. Withdrawals, which cannot begin until the child reaches the minimum pension age, are 25% tax-free with the remainder taxed as income. The one area where the Junior SIPP tax rules are tightening is inheritance tax: from 6 April 2027, most unused pension funds will count as part of the holder’s estate.
Tax Relief on Contributions
Junior SIPPs use relief at source. The provider claims basic rate income tax back from HMRC on every contribution and adds it to the pot, turning £80 net into £100 gross. The contributor does nothing to trigger this.1GOV.UK. Tax on Your Private Pension Contributions – Tax Relief
The child needs no income of their own. HMRC lets providers claim the 20% top-up on contributions up to the basic amount of £3,600 gross per year even when the member has zero earnings.2GOV.UK. PTM044100 – Contributions: Tax Relief for Members: Conditions
One point trips up higher earners. Higher-rate and additional-rate taxpaying parents cannot claim extra relief through their own tax return on money they put into a child’s pension. The pension belongs to the child, and when someone else pays into your pension the relief is fixed at 20% regardless of the contributor’s tax bracket.1GOV.UK. Tax on Your Private Pension Contributions – Tax Relief
Annual Contribution Limits
For most children, the ceiling is £2,880 net per tax year, which grosses up to £3,600 after relief. That cap covers all contributions from every source combined. If a parent pays £2,000 net and a grandparent pays £880 net, the limit is reached.1GOV.UK. Tax on Your Private Pension Contributions – Tax Relief
There is one exception. A child with relevant UK earnings above £3,600 (from modelling, acting, or any employment) can receive relief on contributions up to 100% of those earnings. In practice this matters only for child performers and young entrepreneurs.2GOV.UK. PTM044100 – Contributions: Tax Relief for Members: Conditions
The allowance resets every 6 April. Exceeding it can trigger tax charges or force the provider to return the excess.
Inheritance Tax on the Money Going In
Paying into a child’s or grandchild’s Junior SIPP counts as a gift for IHT purposes, which puts it inside the contributor’s estate planning.
The simplest route is the annual exemption. Each person can give away up to £3,000 per tax year with no IHT consequences, and a couple can combine their exemptions to cover £6,000 — enough to fully fund a Junior SIPP between them.3GOV.UK. How Inheritance Tax Works: Thresholds, Rules and Allowances – Rules on Giving Gifts
Contributors giving more than that may qualify under “normal expenditure out of income,” which has no upper limit. Three conditions all have to be met: the payments form part of a regular pattern, they come from income rather than capital, and the contributor still has enough income to maintain their usual standard of living after making them.4GOV.UK. IHTM14231 – Lifetime Transfers: Normal Expenditure Out of Income: Introduction
Gifts that fit neither exemption are potentially exempt transfers. They fall out of the estate entirely if the contributor survives seven years. Death within that window can bring the gift partially or fully back into charge.3GOV.UK. How Inheritance Tax Works: Thresholds, Rules and Allowances – Rules on Giving Gifts
Tax-Free Growth Inside the Account
Money inside the Junior SIPP grows in a sheltered environment. Selling shares, funds, or bonds at a profit creates no capital gains tax. Dividends and interest earned inside the pension are free of income tax.
A Junior SIPP opened at birth may compound for 50 years or more before the holder can touch it, and none of that growth carries an annual tax drag. No tax filings are needed on the account while the child is a minor.
What Changes at Age 18
On the child’s 18th birthday the Junior SIPP automatically becomes an adult SIPP. No new account is opened. The young adult takes over investment decisions and can change funds, adjust strategy, or switch provider.
The money does not unlock. Only control changes. The holder can also start making their own contributions, at which point normal adult pension rules apply, including relief on contributions up to 100% of earnings or the annual allowance (currently £60,000), whichever is lower.
Tax on Withdrawals in Retirement
The earliest a Junior SIPP holder can draw the pension is the normal minimum pension age, which rises from 55 to 57 on 6 April 2028. Withdrawing earlier without a qualifying circumstance such as serious ill health triggers substantial unauthorised payment charges.5GOV.UK. Increasing Normal Minimum Pension Age
Once eligible, the holder can take up to 25% of the pension as a tax-free lump sum, capped at £268,275 under the lump sum allowance.6GOV.UK. Tax on Your Private Pension Contributions – Lump Sum Allowance
Anything beyond the tax-free portion is taxed as income in the year it comes out, at the holder’s marginal rate:
- Basic rate of 20% on taxable income between £12,571 and £50,270
- Higher rate of 40% on taxable income between £50,271 and £125,140
- Additional rate of 45% on taxable income above £125,140
A large single-year withdrawal can push the holder into a higher band, so many people spread withdrawals across tax years to hold the rate down.7GOV.UK. Income Tax Rates and Personal Allowances
Tax on Death Benefits
If the holder dies before the pension is exhausted, the tax treatment for beneficiaries turns on the holder’s age at death.
Death before age 75 usually means beneficiaries pay no income tax on inherited pension funds, whether taken as a lump sum or as drawdown. For a lump sum to be fully tax-free, it must be paid within two years of the provider being notified of the death and fall within the deceased’s lump sum and death benefit allowance (currently £1,073,100).8GOV.UK. Tax on a Private Pension You Inherit
Death at age 75 or older means beneficiaries pay income tax at their own marginal rate on any withdrawal, lump sum or income alike.8GOV.UK. Tax on a Private Pension You Inherit
The 2027 Inheritance Tax Change
Under current rules, pensions generally sit outside the estate for IHT. That is changing. From 6 April 2027, most unused pension funds and death benefits will be included in the value of a person’s estate for IHT, with pension scheme administrators responsible for reporting the value to HMRC and paying any IHT due.9GOV.UK. Technical Consultation – Inheritance Tax on Pensions: Liability, Reporting and Payment
For Junior SIPPs, funds that would previously have passed IHT-free may face a 40% charge if the holder’s total estate exceeds the nil-rate band at death. The change applies to defined contribution and defined benefit schemes, including UK-registered schemes and qualifying non-UK pension schemes. Beneficiaries become jointly liable with the pension scheme administrator for unpaid IHT twelve months after the death.9GOV.UK. Technical Consultation – Inheritance Tax on Pensions: Liability, Reporting and Payment
The income tax advantages of contributions, growth, and withdrawals during the holder’s lifetime are untouched. Families who viewed a Junior SIPP partly as a way to pass wealth IHT-free will need to reconsider that side of the plan from April 2027 onward.