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Junior ISA

Junior ISA
Calculator

Remember: You can’t calculate the future
Our calculators should only be used as an indication. Investment growth is likely to differ and if you change factors like your regular contributions, results will vary.

How much could your child's Junior ISA be worth?

Amount you'd like to invest each year (?)

£ or £83.33 per month
£
3 years

Expected growth rate (?)

Results

About this Junior ISA calculator

This Junior ISA calculator is an example - it doesn’t show what your child's investments will actually be worth. Remember investments can go down as well as up in value so your child could get back less than you put in.

We don't charge for holding investments in a Junior ISA but the investments you choose may have their own charges. To make these calculations, we factored in a total of 1.25% in annual charges, but this could be lower or higher, depending on the investments you hold. We haven’t factored in inflation.

Tax rules for Junior ISAs can change and any benefits depend on individual circumstances. Investing is best considered for the long term (5 years or more).

Find out more about Junior ISAs

Open a Junior ISA See our Junior ISA investment ideas

The Junior ISA allowance for 2025/26 is £9,000 and for the purposes of this calculator it is assumed to remain at £9,000 until the child reaches 18.
This is the annual growth rate you anticipate on your child's investments. This rate is not guaranteed – the value of investments can rise and fall so your child could get back less than invested.
For children born between 1 September 2002 and 2 January 2011, parents will need to transfer their Child Trust Fund (if they haven’t done so already) to open a Junior ISA.