What are Junior ISAs (JISAs) and are they worth it?

Are Junior ISAs worth it? At a glance

• What do I need to know? Junior ISAs let you save up to £9,000 a year for your children tax-free, until they turn 18 years old.
• What does it mean for me? Building generational wealth is about more than just gifting money. It’s about teaching younger generations how to grow their finances responsibly.
• Why does it matter? Saving money in a Junior ISA can be valuable alongside other savings, investments, and efforts to teach financial literacy. 

According to research commissioned by Flagstone, parents save over £18,000 on average for their dependents in the UK. There are different ways to save and gift money to younger generations. And each strategy comes with advantages and limitations in terms of tax, control, and growth.

One popular way to save for dependents is to open a Junior ISA (Individual Savings Account). But how do Junior ISAs work, and are they suitable for your family?

What is a Junior ISA?

Junior Individual Savings Accounts (JISAs) are tax-efficient savings accounts designed specifically for parents to save for their child’s future.

How do Junior ISAs work?

You can save up to £9,000 a year (as of the 2025/26 tax year) in JISAs where your savings can grow tax free.

When your child turns 16, they legally inherit the account(s) but can’t withdraw the money.

The, when your child turns 18, their JISAs turn into adult ISAs. This means the beneficiary can access, withdraw, or add funds to the account.

All withdrawals are tax-free.

Who can open a Junior ISA?

To open a JISA, you need to be a parent or legal guardian of the child. But once the JISA is open, anyone can contribute. Your child must be under 18 and live in the UK.

Types of JISA

There are two types of Junior ISA:

• Cash JISAs: Savings accounts that earn interest steadily with low risk. Balances in Cash ISAs often enjoy Financial Services Compensation Scheme (FSCS) protection, though you may need to check this is the case for your account. Exact rates and features vary depending on your provider.
• Stocks and Shares JISAs: Your contributions are invested in stocks and shares, either through provider-selected funds or investments chosen by you. There are no guarantees your investments will grow in value. But, when they do, the increase can be greater than the interest you make in traditional savings accounts. 

You can open both types of ISA for your child and spread your contributions between the two accounts. The exact split that’s right for you will depend on your personal circumstances and preferences.

A Cash JISA could help you reach a specific savings target, especially if you set up regular deposits and fund the account as early as possible. This is because your child’s cash savings can benefit from compound interest.

But a Stocks and Shares JISA could return a greater amount if the investments perform well. It’s important to remember that as with all investments, there are no guarantees, and you could lose the money you invest.

Tax rules for JISAs

ISAs are a type of account known as a ‘tax wrapper’. HMRC doesn’t charge tax on the money you earn in an ISA, although there are annual limits on how much you can fund the accounts.

Annual ISA limits apply to each taxpayer in the UK. JISAs count towards the child’s allowance, meaning this won’t impact your personal ISA limits by funding your child’s account.

So, you can still maximise your current £20,000 annual allowance and set aside £9,000 for your child in a JISA in the same year. And while the government announced reforms to adult Cash ISAs in the 2025 Autumn budget - reducing annual contribution limits to £12,000 for savers under 65 from 06 April 2027 - JISA limits remain unchanged.

You cannot open a JISA if the beneficiary already has a Child Trust Fund (CTF) in their name (a previous type of tax-free account). But you can transfer the balance from an existing CTF into a JISA.

Advantages and disadvantages of JISAs

Understanding the benefits and limitations of Junior ISAs can help you decide whether opening an account makes sense for your family:

Are Junior ISAs still worth it?

Junior ISAs provide a tax efficient way to save for your children’s future. But they are limited in terms of the amount you can contribute and how much control you get over the account as your child gets older.

This means they can often form part of your savings strategy alongside other financial products.

The benefits of starting early

Opening a JISA as soon as your child is born gives their savings and investments the most time possible to grow through compound interest. Compounding takes time, but it’s one of the most impactful ways to grow your wealth, even if you decide to invest your savings elsewhere as your child approaches adulthood.

See how much your savings could grow using our compound interest calculator.

Preparing for sudden wealth

One challenge with JISAs is that the entire balance is available to your child as soon as they turn 18 years old. This is a young age to inherit a significant sum. And many parents worry that gifting money to children this young will impact their desire to learn how to create and grow their own wealth.

This is why it’s important to teach your child financial literacy early, so that they’re best placed to turn their lump sum into generational wealth.

Alternatives to JISAs for growing generational wealth

So, what other ways are there to grow your family’s wealth beyond JISAs?

Trusts

With certain kinds of trust funds, you can set aside money for a beneficiary to receive when specific conditions are met. You can sometimes maintain control over how the money is spent, depending on the type and rules of the trust.

But trusts come with complex tax rules. It’s highly likely you’ll need qualified financial advice to set up a trust.

Direct gifting

You can use annual allowances that let you gift money tax-free each year.

Annual exemption

The annual exemption allows you to give away £3,000 each year without paying Inheritance Tax. And you can carry your allowance over if you didn’t use it the year before. But you can only do this once.

Small gift allowance

Your small gift allowance lets you transfer £250 to as many people as you wish each year. But you can’t use the small gift allowance for someone that’s already benefitted from your annual exemption.

It’s important to remember that both of these limits are much lower than the annual JISA allowance. The money also must go to your child directly. This means there’s nothing stopping your child from spending it, whereas the JISA locks the money away until they become an adult.

Pensions

Some people plan to use their pension to gift money to children after they pass away. Over the course of your career, you might invest heavily in your pension to maximise tax efficiency. But, when you retire, you may live off your other wealth, leaving a potentially large sum for your dependents to inherit.

But the rules around Inheritance Tax and pensions are changing from 2027. HMRC will start to charge Inheritance Tax on unused pension funds, which were previously tax-free.

Cash savings

Compared with JISAs, adult Cash ISAs have a greater total allowance. So, if you don’t intend to use your full limit for yourself, you could save money into your own ISAs and gift money when you choose. HMRC allows adult Cash ISA contributions of up to £20,000 each year (reducing to £12,000 per year in 2027).

You can also use a savings platform to spread your cash between multiple ISAs and accounts to access competitive interest rates. But it’s important to consider that HMRC charges tax on the interest you earn on cash savings above your Personal Allowance.

Frequently asked questions about Junior ISAs

Can parents withdraw money from a Junior ISA?

No. Only the beneficiary of the account can make withdrawals once they turn 18, unless there are exceptional circumstances.

For example, if your child has a terminal illness or passes away, the provider of the account can grant the parent or guardian permission to withdraw the money.

Can grandparents open a Junior ISA for a grandchild?

In most cases, no. Grandparents can’t open a Junior ISA account for a child unless they’re a legal guardian. But they can contribute to Junior ISAs opened by somebody else, provided the total contributions in the account don’t exceed the £9,000 annual limit.

Once you open a JISA for a child, anyone can pay money into the account provided they have the details.

Do you have to tell your child they have a Junior ISA?

No, you don’t legally have to tell them about the account until they turn 16 years old. And, according to research commissioned by Flagstone, nearly 14% of parents saving for their dependents want the money to remain a surprise.

But the challenge with Junior ISAs is that the beneficiary inherits the full account at a relatively young age. Introducing your child to the idea of protecting and growing wealth early can help them maximise what they inherit long-term - even if it means telling them about your savings strategy.

What is the best age to open a JISA?

There are no set rules on when you should open a JISA for your child. But, as with most savings, starting early gives the greatest chance for your contributions to grow because of compound interest.

You can open a JISA as soon as your child is born.

What is the difference between a Child Trust Fund and a Junior ISA?

Child Trust Funds were the previous tax-free saving scheme for children offered by the government. CTFs worked like JISAs - offering tax-free interest on up to £9,000 each year - but only for children born between 1 September 2002 and 2 January 2011.

You can usually transfer the balance of a CTF to a JISA without getting charged. But you should check the terms and conditions of the account to make sure.

Start your dependents on their wealth journey with Junior ISAs

Junior ISAs offer a unique way to save for your children’s future tax-free. Adding them to a wider savings strategy can allow you to balance security, growth, and control.

But JISAs represent more than a tax-free savings account. Opening a JISA early and passing over control of the account at 16 can spark important conversations around wealth, especially if you prepare in advance.

Teaching the younger generation about taxes and the power of compound growth can inform their financial education. Discussing how you save your money to maximise the value of savings can help inspire healthy financial habits that last a lifetime.

Grow lasting wealth with high interest savings

Junior ISAs don’t count towards your annual ISA allowance, meaning you can still save £20,000 to maximise your tax-free interest.

With a minimum deposit of £10,000, Flagstone's savings platform gives you access to multiple Cash ISA accounts with one login.

Fund your holding account and easily move and manage your money, all in one place.

Discover the Flagstone ISA