Junior Stock & Shares ISA
Invest Tax-Free and Trade Commission-Free with a Mexem UK Junior Stock & Shares ISA and take full advantage of your annual tax allowance by opening a Junior Stocks & Shares Individual Savings Account with Mexem UK today.
A Junior Stock & Shares ISA (JISA) is a tax-free savings and investment account for children under 18. You can contribute up to £9,000 per child per tax year (2025/26). Parents or legal guardians open and manage the account, but the investments belong to the child, who gains full control when they turn 18
Why join Mexem?
Secure & Regulated
Low Cost and Transparent fees
All pricing is clear and published, so you always know what you’re paying.
Institutional Technology for Every Investor
Eligible products
Trade seamlessly across 150+ global exchanges with transparent pricing, advanced tools, and regulated protection.
Global Stocks & Shares
Corporate Bonds
Government Bonds
Depository Receipts
Eligible American Depository Receipts
Recognised UCITS
ETFs
Mutual Funds
Advanced Tools. Seamless Experience.
Portfolio analyst
Tax reporting
CSV/EXCEL export
Smart Routing Technology
No custody or platform fee
All trading costs are clearly shown before order execution and detailed in your statements.
Global market access
Transparent Pricing
FREE
FREE
FREE
£2 per trade
FREE
FREE
0.25% (any trade value)
*Third party fees apply
0.25%
(max £3.50/month)
£5
(or £3.50 if ≥10 trades last month)
£5
(or £3.50 if ≥10 trades last month)
£5
(or £3.50 if ≥10 trades last month)
£5
(or £3.50 if ≥10 trades last month)
£5
(or £3.50 if ≥10 trades last month)
0.75%
0.45% per annum
(capped at £45/year)
£5.99 - £11.95
(lower tier for 20+ trades)
£5.99 - £11.95
(lower tier for 20+ trades)
£5.99 - £11.95
(lower tier for 20+ trades)
£5.99 - £11.95
(lower tier for 20+ trades)
£5.99 - £11.95
(lower tier for 20+ trades)
0.25% - 1%
(Depending on trade value 5-20K+)
£4.99/month
(for accounts under 50K)
£3.99
£9.99
(or £5.99 on a plan)
£3.99
£9.99
(or £5.99 on a plan)
£3.99
1.5%
(on the first 25K)
FREE
$0.004 per share
(min $0.8)
0.04% per trade
(min €0.8)
0.04% per trade
(min £0.8)
$0.004 per share
(min $0.8)
0.002% per trade
(min $2 or equivalent)
0.25%
(max £3.50 per month)
£5
(or £3.50 if ≥10 trades last month)
£5
(or £3.50 if ≥10 trades last month)
£5
(or £3.50 if ≥10 trades last month)
£5
(or £3.50 if ≥10 trades last month)
0.75%
£4.99
(for accounts under 50k)
£3.99
£9.99
(or £5.99 on a plan)
£3.99
£3.99
1.5%
(on the first £25k)
FREE
$0.015 per share
(min $1)
0.08%
(min £3 - 10)
0.08%
(min £3)
$1
(on US listed ETFs)
0.25%
Already investing elsewhere?
Create your account online, verify your details, and start investing globally, all within a secure, FCA-regulated environment
You can fund your account in GBP, EUR, or other major currencies, and begin trading through Trader Workstation (TWS), Client Portal, or Mobile App.
No, the only ISA account type that MEXEM offers is a non flexible Stocks and Shares ISA account. That means you can take money out, but it will count towards your annual ISA allowance if you pay it back in the same tax year.
Yes, you will need a National Insurance Number (NINO) to open an ISA account.
Please Note:
If not already listed then you need to enter the National Insurance Number in the Tax ID section of your profile to open a linked ISA account.
Otherwise the system will return an error if you do not.
See the following steps from your Client Portal:
Click the Person icon on the top right of the screen
> Settings
> Account Settings followed by Account Profile
> Profile Followed by the Pencil Icon to Edit your Profile information
> In the Tax Residency section you may edit the information or remove Tax Residency and add another Tax Residency
For the 2025/26 tax year, the Junior ISA annual allowance is £9,000.
This limit applies across all Junior ISAs your child may hold, including both cash and stocks & shares accounts.
Parent or legal guardian:
Opens the account and acts as the registered contact.
Ownership:
All contributions belong to the child.
Access:
Funds remain locked until the child turns 18, at which point the Junior ISA automatically converts into an adult Stocks & Shares ISA.
A Junior ISA (JISA) is a tax-free savings and investment account designed to help you build a secure financial future for your child. Any money you invest grows free from Income Tax and Capital Gains Tax, making it one of the most efficient ways to save for their future.
There are two types of Junior ISAs available in the UK:
Junior Cash ISA – earns tax-free interest.
Junior Stocks & Shares ISA – lets you invest in a wide range of qualifying investments such as shares, ETFs, funds, and bonds.
At MEXEM, we will soon offer a Junior Stocks & Shares ISA that gives you access to 150+ global markets, 33 countries, and 23 currencies, all through our powerful trading platforms.
Secure & Regulated Trading
Your funds are held in segregated accounts, entirely separate from MEXEM's operational capital, ensuring your money is protected and easily identifiable.
