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Please note that tax, investment, pension and ISA rules can change and the information and any views contained in this article may now be inaccurate.
Building a £1 million tax-efficient portfolio for your children

Parents who have lots of spare money each year can build up a hefty portfolio for their children by the age of 18 by maximising the tax-efficient accounts available to them.
Parents of three children can use a combination of starting early, generous contributions, pensions tax relief and investment growth to hand their kids a collective pot worth just in excess of £1 million by the youngest child’s 18th birthday.
Children benefit from generous allowances on tax-efficient accounts, with parents able to save up to £9,000 a year per child in a Junior ISA each tax year, as well as £2,880 per child in a Junior SIPP each year. The SIPP will benefit from pension tax relief, even though the child may not be a taxpayer.
By starting from birth and maxing out the annual allowances for three children up to their 18th birthdays, parents will hit the magic £1 million mark, assuming investment growth of 4% a year after charges.
JUNIOR ISA PAYMENTS
Parents will need to open a Junior ISA when the child is born and can pay in £9,000 per tax year. Over the first 18 years of their child’s life it means parents will end up contributing £162,000 per child into ISAs. However, if we assume investment growth of 4% a year after charges this pot will grow to £240,000 by the age of 18.
The Junior ISA will become the child’s own savings once they hit their 18th birthday, with the account rolling over into an adult ISA, for them to keep invested or choose to spend on further education, a house or the world’s flashiest gap year.
JUNIOR SIPP CONTRIBUTIONS
Parents can pay in up to £2,880 a year into a Junior SIPP, and the Government will add £720 each year, per child, topping up the annual contribution to £3,600. The parents’ £2,880 annual Junior SIPP contributions add up to a total of £51,840 per child over the 18 years. However, this is boosted to almost £65,000 once tax relief is added on and to £96,000 once investment growth of 4% a year is included over the 18 years.
The Junior SIPP money will be tied up until the child’s retirement age, which is currently age 55 but is rising. Even if you made no further contributions after they reached their 18th birthday and the money grew by 4% a year, that £96,000 pension pot would grow to £503,000 by the age of 55.
INVESTING IS KEY
While lots of parents stick to cash for their children’s savings, an 18-year time horizon is the ideal period to take more risk and invest the money. It’s the best way of getting inflation-beating returns over that period and could significantly boost your child’s wealth.
Clearly putting away £11,880 a year per child isn’t attainable for lots of parents, but they can draft in grandparents or other family and friends to help reach that sum, all of which are able to make contributions to a Junior ISA and SIPP.
Important information:
These articles are provided by Shares magazine which is published by AJ Bell Media, a part of AJ Bell. Shares is not written by AJ Bell.
Shares is provided for your general information and use and is not a personal recommendation to invest. It is not intended to be relied upon by you in making or not making any investment decisions. The investments referred to in these articles will not be suitable for all investors. If in doubt please seek appropriate independent financial advice.
Investors acting on the information in these articles do so at their own risk and AJ Bell Media and its staff do not accept liability for losses suffered by investors as a result of their investment decisions.
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