A Junior Stocks and Shares ISA (JISA) is a tax-free investment account for children under 18. Parents or guardians can contribute up to 9,000 pounds per tax year (2025/26), and any growth, dividends or interest is completely free from UK tax. The money is locked until the child turns 18, when it automatically converts into an adult ISA. For long-term wealth building, a Junior Stocks and Shares ISA can be significantly more rewarding than a Junior Cash ISA.
What Is a Junior Stocks and Shares ISA?
A Junior Stocks and Shares ISA is a tax-efficient investment account designed specifically for children. It works the same way as an adult Stocks and Shares ISA but with a lower annual allowance and one important restriction: the money cannot be withdrawn until the child reaches 18.
The account must be opened by a parent or legal guardian, but once it is set up, anyone can contribute, including grandparents, other family members and friends. This makes it a popular option for building a nest egg for a child's future, whether for university, a first car or a deposit on their first home.
Junior ISA Rules and Allowance
| Rule | Details |
|---|---|
| Annual allowance (2025/26) | £9,000 per child |
| Who can open it | Parent or legal guardian |
| Who can contribute | Anyone (parents, grandparents, family, friends) |
| Minimum age | Under 18 and UK resident |
| Self-management age | From age 16 (some providers 18) |
| Access to funds | Locked until child turns 18 |
| What happens at 18 | Converts to adult Stocks and Shares ISA |
| Tax on returns | All growth, dividends and interest tax-free |
| Number allowed | One Junior Cash ISA + one Junior S&S ISA per child |
| Allowance rollover | No, use it or lose it each tax year |
| Child Trust Fund | Can be transferred to a JISA |
The 9,000 pound allowance can be split between a Junior Cash ISA and a Junior Stocks and Shares ISA in any proportion. For example, you could put 6,000 pounds into a Stocks and Shares JISA and 3,000 pounds into a Cash JISA. The total across both cannot exceed 9,000 pounds.
Why Choose a Junior Stocks and Shares ISA Over Cash?
With money locked away until the child turns 18, a Junior Stocks and Shares ISA has a naturally long investment horizon, which suits stock market investing. Historical data shows that stocks and shares ISAs have significantly outperformed cash ISAs over longer periods.
| Scenario | Junior Cash ISA (3% avg) | Junior S&S ISA (7% avg) |
|---|---|---|
| £9,000/year for 5 years | £48,100 | £52,100 |
| £9,000/year for 10 years | £103,200 | £124,400 |
| £9,000/year for 18 years | £208,700 | £305,200 |
Investing the full 9,000 pound allowance each year from birth at an average 7% annual return could result in a pot worth over 305,000 pounds by the child's 18th birthday. At a 3% cash rate, the same contributions would produce around 208,700 pounds. That is a potential difference of nearly 100,000 pounds, all tax-free.
Of course, stock market returns are not guaranteed and the value of investments can fall as well as rise. But with an 18-year time horizon, the balance of probability heavily favours investing over cash.
Best Junior Stocks and Shares ISA Providers
| Provider | Platform Fee | Minimum | Key Feature |
| Hargreaves Lansdown | 0.45%* (from March 2026: 0.35%) | 25 pounds/month or 100 pounds lump | Widest investment range, no JISA charge |
| AJ Bell | 0.25% | 25 pounds lump | Low fees, strong fund range |
| Wealthify | 0.60% | 1,000 pounds | Best for managed/hands-off approach |
| Nutmeg (JP Morgan) | 0.45% to 0.75% | 100 pounds | Good managed portfolios, five styles |
| Moneyfarm | 0.70% | 500 pounds | Includes financial advice |
| Fidelity | 0.35% | 25 pounds/month or 1,000 pounds lump | Strong fund selection, low cost |
| Interactive Investor | From 5.99 pounds/month | No minimum | All ii plans include JISA |
*Hargreaves Lansdown platform fee changes to 0.35% from March 2026. (Source: Provider websites, February 2026.)
If you want a DIY approach with the widest choice of investments, Hargreaves Lansdown and AJ Bell are strong options. For a hands-off managed approach, Wealthify, Nutmeg and Moneyfarm will build and manage a diversified portfolio for you.
How to Open a Junior Stocks and Shares ISA
Opening a JISA takes around 10 to 15 minutes with most providers. Here is what you need:
Step 1: Choose a provider based on fees, investment options and minimum contributions.
Step 2: The parent or legal guardian with parental responsibility creates the account. You will need your child's full name, date of birth and address.
Step 3: Provide ID for yourself (the registered contact) and your child's details. Some providers require proof of address.
Step 4: Make your initial deposit (lump sum or direct debit) and select your investments.
Once the account is open, you can share the details with grandparents and other family members so they can contribute directly. Many providers offer a gift link or reference number for this purpose.
Child Trust Fund Transfers
Children born between 1 September 2002 and 2 January 2011 may have a Child Trust Fund (CTF). A child cannot hold both a CTF and a Junior ISA at the same time, but you can transfer a CTF into a JISA. This is often worthwhile because JISAs typically offer better investment options and lower fees.
An important benefit of transferring: the CTF has its own 9,000 pound annual allowance. If you transfer a CTF to a JISA, the child gets a fresh 9,000 pound JISA allowance on top of any CTF contributions already made that year. This means up to 18,000 pounds could be added to their tax-efficient account in the same tax year.
What Happens When the Child Turns 18?
On the child's 18th birthday, the Junior ISA automatically converts into an adult Stocks and Shares ISA in their name. The child (now an adult) gains full control and can withdraw the money, continue investing or transfer to another provider. The money then falls within the standard 20,000 pound adult ISA allowance.
One consideration for parents: once the JISA converts, the money legally belongs to the child and you have no control over how they use it. If this concerns you, an alternative is to invest within your own ISA and gift the money to your child when you choose.
Frequently Asked Questions
How much can I put in a Junior ISA?
The Junior ISA allowance for the 2025/26 tax year is 9,000 pounds per child. This is shared between any Junior Cash ISA and Junior Stocks and Shares ISA the child holds.
Can my child have more than one Junior Stocks and Shares ISA?
No. A child can only hold one Junior Cash ISA and one Junior Stocks and Shares ISA at any time. However, you can transfer between providers without affecting the allowance.
Can grandparents contribute to a Junior ISA?
Yes. Once the account is open, anyone can contribute, including grandparents, aunts, uncles and family friends. The total contributions from all sources must not exceed 9,000 pounds per tax year.
Is a Junior ISA better than a savings account?
For money that will not be needed until the child turns 18, a Junior Stocks and Shares ISA has historically delivered higher returns than cash savings. However, investments can fall in value, so a Junior Cash ISA may be better for shorter time horizons or if you prefer guaranteed capital protection.
What investments can I hold in a Junior ISA?
The same range as an adult Stocks and Shares ISA: shares, ETFs, index funds, bonds, investment trusts and managed portfolios. The exact range depends on your chosen provider.
Does a Junior ISA count towards my ISA allowance?
No. The Junior ISA allowance (9,000 pounds) is entirely separate from the adult ISA allowance (20,000 pounds). Contributing to a JISA does not reduce your own ISA allowance.
Can I withdraw money from a Junior ISA?
No. Money in a Junior ISA is locked until the child turns 18. The only exception is in the event of terminal illness or death. This lock-in is a deliberate feature designed to encourage long-term saving.
What if I already have a Child Trust Fund?
You can transfer a Child Trust Fund to a Junior ISA, which often provides access to better investment options and lower fees. Contact your chosen JISA provider to arrange the transfer.
Is a Junior ISA protected if the provider fails?
Yes. Junior ISAs held with FCA-regulated providers are covered by the Financial Services Compensation Scheme (FSCS) up to 85,000 pounds per person for investment claims.
Can a 16 or 17 year old open their own Junior ISA?
Children aged 16 and 17 can open their own Junior Stocks and Shares ISA with some providers. They can also open an adult Cash ISA from age 16, but must wait until 18 for an adult Stocks and Shares ISA.
Related Reading
Stocks and Shares ISA Explained
Cash ISA vs Stocks and Shares ISA
