3.56% AER* Junior Cash ISA
Your child's first financial steps begin here. Start creating a financial head start for their future from day one with our 3.56% AER* Junior Cash ISA. Get started and fund it with a minimum of £1.
*Interest rates are subject to change; Junior ISA Terms and Conditions apply. AER stands for Annual Equivalent Rate and shows you what the interest rate would be if interest was paid and compounded once a month. ISA and tax rules apply.
Why choose CMC Invest?
3.56% AER* (variable) – earned daily, paid monthly
Save up to £9,000 for each child across all their ISAs each tax year. Interest earned on their money is 100% tax-free, accumulates daily and is paid monthly.
Low minimum deposit
Open a Junior Cash ISA and fund it with a minimum of £1.
Transfer Junior ISAs from other providers
Transfer existing Junior ISAs and/or Child Trust Funds in just a few taps in the app. Learn more about our transfer process.
Open and manage the account in our app
No need for paperwork or branches – you can open, manage and track your account all online via our app. Simply download the CMC Invest app and follow the steps to open a Junior Cash ISA.
Over 2 million global customers*
We’re part of the CMC Markets plc group, a FTSE 250 index financial services group of companies serving over 2 million customers* globally.
Your savings are protected with an authorised bank. Read more on how it's protected.
*Based on over 2 million unique user logins across CMC's trading and investing platforms, including partners, as at November 2025.
What is a Junior Cash ISA?
A Junior Cash ISA is a savings account for children that lets you earn interest on their savings tax-free. That means no UK income tax is payable on the interest earned within the ISA.
The account allows parents or guardians to deposit up to £9,000 per tax year across all Junior ISAs on behalf of the child. Withdrawals are not permitted until the child turns 18, at which point the Junior Cash ISA automatically converts into an adult ISA. The savings remain in the child’s name throughout, helping build a financial foundation for their future.
Tax treatment depends on individual circumstances and may change in the future.
Junior Cash ISA guidance
We're here to support you on your financial journey. Visit the learn hub to find out more about building wealth.
Straightforward and transparent price plans
Browse and choose from one of our plans that suits what you need. No hidden fees, no nasty surprises, just straightforward and transparent pricing. FX fees and UK government charges may apply.
Core
Plus
Premium
Core plan
£0/month
Accounts
- Junior Cash ISA
- Flexible Cash ISA
- General Investment Account
- Flexible Stocks & Shares ISA
- Self-invested Personal Pension
Benefits
- £0 Commission
- 4,600+ global stocks & ETFs
- Earn on uninvested cash* - 1.26% for GBP, 1.26% for USD (GIA only)
- 0.99% FX fee
- Limit orders
- Analyst ratings, price targets and Bull says, Bear says
- ESG ratings and preferences
Plus plan
£6.99/month
Accounts
- Junior Cash ISA
- Flexible Cash ISA
- General Investment Account
- Flexible Stocks & Shares ISA
- Self-invested Personal Pension
Benefits
- Everything in Core
- 6,100+ global stocks & ETFs, including Mutual funds and AIM stocks
- Earn on uninvested cash* - 2.27% for GBP, 2.53% for USD (GIA only) & 0.50% for EUR (GIA only)
- 0.50% FX fee
- USD & EUR currency wallets (GIA only)
Premium plan
£10.99/month
Accounts
- Junior Cash ISA
- Flexible Cash ISA
- General Investment Account
- Flexible Stocks & Shares ISA
- Self-invested Personal Pension
Benefits
- Everything in Core and Plus
- Earn on uninvested cash* - 3.30% for GBP, 3.30% for USD (GIA only) & 1.51% for EUR (GIA only)
- 0.39% FX fee
- Free OPTO Foresight subscription
When you invest, your capital is at risk.
For the full list of platform benefits, compare our price plans.
*Variable. AER stands for Annual Equivalent Rate and shows you what the interest rate would be if interest was paid and compounded once a month.
Frequently asked questions
What is a Junior Cash ISA?
A Junior Cash ISA is a tax-free savings account for children under the age of 18 who are resident in the UK. Parents or legal guardians can save up to £9,000 per tax year, and the money belongs to the child. Funds are locked until they turn 18, helping build a financial foundation for their future.
Is my money protected?
Yes, CMC Invest is authorised and regulated by the Financial Conduct Authority (FCA) and we have regulatory permissions to hold and control client money.
Learn more about how your money is protected.
Can I transfer an existing Junior Cash ISA to CMC Invest?
Yes, you can. A child can only have one Junior Cash ISA (JISA). If you want to open a new account, you’ll need to transfer your existing JISA to CMC Invest.
All you have to do is download the CMC Invest app, open a JISA, fill out our transfer form in the app, and we’ll work with your current provider to transfer your savings on your behalf. Learn more about our transfer process.
However, if you’re transferring a fixed-rate ISA before maturity (when the fixed-rate ISA ends), you may incur an early closure charge or penalty from your current provider.
Can I transfer a fixed-rate Junior Cash ISA?
Yes, you can. You can transfer a fixed-rate ISA before or after the maturity date (when the fixed-rate ISA ends). However, it's essential to be aware that transferring a fixed-rate ISA before its maturity may incur an early closure charge from your current provider.
How do I open and manage the account?
If you're a parent or legal guardian, you can open and manage the account for a child under 18 years old who lives in the UK.
A Junior Cash ISA can be opened from as little as £1, and has a £9,000 annual contribution limit across all Junior ISAs – including a Junior Stocks & Shares ISA.
Transferring existing Junior Cash ISAs to CMC Invest can be initiated and managed all within the CMC Invest app. Learn more about our transfer process.
How much money do I need to open a Junior Cash ISA?
With CMC Invest, the minimum amount you can deposit is £1. You can use your debit card to add funds, but you can’t deposit more than £9,000 across multiple Junior ISAs in the same tax year.
Can I withdraw money?
No, you can't. Money can't be withdrawn from a Junior ISA until the child is 18. And any contributions to the Junior ISA can't be refunded and belong to the child.
You can cancel the account free of charge within 14 days of opening. For special circumstance closures, view our terms and conditions.
Do you offer junior ISAs or lifetime ISAs?
Currently, we only offer a flexible Cash ISA and a flexible Stocks & Shares ISA. If you’re interested in us adding other types of ISAs, please let us know using the ‘Send us your feedback’ banner on the home screen in the app.
Does CMC Invest’s Junior Cash ISA have any fees?
No, there are no fees to hold a Junior Cash ISA.
What does AER mean?
AER stands for Annual Equivalent Rate and shows you what the interest rate would be if interest were paid and compounded once each year. To learn more about the difference between AER and gross interest.
What happens if CMC Invest changes the interest rate?
If CMC Invest changes our interest rate offering, then notice of this will be published on our website and the wallet screen in the app.
How is interest calculated and when is it paid?
Interest on your balance is calculated daily and displayed as ‘Pending interest’ in your account until it is paid to you monthly. Your interest is typically paid into your Cash ISA on the 3rd working day of the month, but no later than the 10th working day.
Can I set up regular deposits?
Yes, you can. In the app, all you have to do is tap ‘Add cash’ and then ‘Set up regular deposits’. Use the bank details provided to set up regular online banking payments with your bank to save time with automatic top-ups. Bank transfers are usually instant, but sometimes can take 2 to 3 days to process.
