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Child ISA calculator

See how much you could save with a child ISA.
Junior ISAs

Junior Stocks & Shares ISA

from Fidelity

Regular Savings
  • Investment Options: Over 4,000 investment options, including funds, shares, investment trusts and exchange-traded funds

Why we like it: Fidelity’s guidance service makes it easy to find investment ideas for your child’s savings, plus Fidelity don’t charge a service fee on junior accounts meaning you keep more of your investment for your child. Ongoing fund charges and other fees may apply.

Important: The value of investments can go down as well as up so you may get back less than you invest. The value of tax savings and eligibility to invest in a Junior ISA depend on personal circumstances. All tax rules may change in future. Withdrawals from a Junior ISA will not be possible until the child reaches age 18. This information is not a personal recommendation for any particular investment. If you are unsure about the suitability of an investment you should speak to an authorised financial adviser.

Junior Stocks and Shares ISA

from Hargreaves Lansdown

Regular Savings
  • Investment Options: Invest from £25 per month or deposits of £100.

Why we like it: Invest for your child from £25 pm tax free. A wide range of top performing funds to choose from. The annual charge for holding investments in a Hargreaves Lansdown Junior ISA is never more than 0.45%. Your dealing and other charges will depend on the investments you choose.

Important: The value of your investments can rise as well as fall. You may get back less than you invested. If you’re unsure, we recommend you ask for independent advice.

Try our free child ISA calculator

Click here for our free ISA Calculator »

Child ISA is another name for a Junior ISA (also sometimes known as a children’s ISA) which offers tax-free savings for UK residents under the age of 18. For the 2017/18 tax-year, you can save up to £4,128 in a Junior ISA without paying tax on the interest you earn.

Our free child ISA calculator allows you to quickly see how much you or your child could save with a tax-free Junior ISA. You can see what impact putting different amounts into the ISA will have, as well as how much difference various interest rates and the length of time the ISA lasts will make.

With so many different ISA providers and types of ISAs to choose from, our quick, simple ISA comparison tool makes it much easier to make the right choice for your savings.

Junior ISA investment

Using our Junior ISA calculator to compare ISA deals for children

Our child ISA calculator lets you compare the effect of three different things on the return you can expect on your junior ISA:

  • Amount saved
  • Interest rate earned
  • Length of time saved for

This means if you have a specific amount you are intending to save, you can see how much this will earn you over the period you want to save for. Alternatively, if you are aiming to build a specific amount, the calculator can let you see how much you need to save, how long for and what sort of interest rate you will need to achieve your savings goals.

How accurate is our children’s ISA calculator?

The growth projected by the calculator is only an estimate, as interest rates will tend to vary over time. The figure we suggest should therefore not be taken as a definite prediction.

Our estimate assumes the following:

  • You will deposit money into your account on a regular basis
  • There will be no withdrawals made
  • The market will stay broadly steady
  • Interest rates will remain productive
  • There will be no reduction in the ISA tax-free savings allowance during the term of your account

See how much your child could earn with a Junior ISA

Want to know how much you could earn in tax-free savings with a junior ISA? Try out our free junior ISA calculator now.

Click here for our free ISA Calculator »

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Stocks and Shares ISAs

Latest News

5 Considerations for Your Next Investment ISA

15th March 2021

You've decided to invest your savings into a Stocks and Shares ISA. You'll be using your tax-free ISA allowance for this year before the deadline, while also investing your money for your future. But what do you need to consider before opening an account? We've put together a list of our top five considerations for you to think about before you click "apply". 

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About us is a trading style of Fair Investment Company.

We've been comparing and recommending ISAs for many years so you can trust you're in good hands.

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23 Reviews


I found the way the different options are presented very clear - much more useful than some other comparison sites. I sent it to my daughter as well.


Very informative, find myself a good ISA account with best return in terms of interest.


Easy to use website and up to date. Saved the link on my tablet.

Rob Holden

The website was very useful and informative.

Andrew Johnson

ISA can be confusing at first and this site includes a useful and helpful introduction into the world of ISAs