A flexible Cash ISA allows you to withdraw money and replace it within the same tax year without affecting your annual allowance.

Yes. All interest earned is free from Income Tax and Capital Gains Tax.

To apply for an ISA account you must be a resident of the UK for tax purposes. This includes British citizens, residents of the Isle of Man, and the Channel Islands. You must be at least 16 years old to open a Cash ISA. For Stocks & Shares ISAs and Innovative Finance ISAs, you need to be at least 18 years old. To open a Lifetime ISA, you must be between 18 and 39 years old. You should have a National Insurance number, which helps to verify your identity and residency status. Please note to open an account with XTB you must be at least 18 years old.

The main types of ISAs include:
Cash ISAs: Savings accounts with tax-free interest.
Flexible/Easy Access Cash ISAs: Savings accounts with tax-free interest. A flexible CASH ISA allows you to withdraw money and replace it within the same tax year without affecting your annual allowance.
Stocks & Shares ISAs: Investment accounts for stocks, bonds, and other assets with tax-free capital gains and dividends.
Flexible Cash and Stocks & Shares ISAs: A flexible ISA allows you to withdraw money and replace it within the same tax year without affecting your annual allowance.
Lifetime ISAs: Designed for first-time home buyers and retirement, offering a government bonus on contributions.
Innovative Finance ISAs: Involve peer-to-peer lending and other alternative finance investments.
Please note that we currently offer a Flexible Cash ISA and a Flexible Stocks and Shares ISA only.

For the tax year 2025/26, the annual contribution limit is £20,000. This total can be spread across different types of ISAs. More information here.

Yes you can have multiple ISAs. There's no limit to the number of ISAs you can have, but you can't exceed your annual ISA allowance of £20,000.

If you exceed the ISA limit, the excess contributions may incur tax, and you may need to remove the excess amount from your ISA account.

In that event please get in touch with the HMRC.

No. Any unused allowance is lost at the end of the tax year.

In order to open either a Flexible Cash ISA or a Flexible Stocks & Shares ISA account, you need to create a Real account (GIA) with XTB in GBP. Please note, to open an ISA account you need to be a UK resident and provide your National Insurance number.

How to create an account with XTB

At XTB we request clients to fill out an online application form either through the website or the mobile app. Within this application process, you will need to undertake a relevant assessment, consisting of 4 multiple choice questions. This step is essential to ensure your compatibility with the product.

Upon successful completion of the application, you will be prompted to submit Know Your Customer (KYC) documents, such as identification and proof of address, in order for us to authenticate your identity. Once the KYC process is finalised, your trading account will be established.

With the trading account active, you will gain unrestricted access to both the trading platform and the client office. This provides you with the opportunity to acquaint yourself with the software and, if desired, make an initial deposit to commence your trading activities.
If you already have an account in GBP with XTB, please click the "Save" button and select “Flexible Cash ISA.” Enter your National Insurance number in the correct format. If you need assistance obtaining your NI number, please contact HMRC. Once you’ve filled out all the required information, you’re all set! Top up your account and your ISA. Remember, it’s your responsibility to ensure you don’t exceed the annual limit across all ISA accounts.

Flexible/Easy-access lets you withdraw without penalties and still retain your full ISA allowance for that given tax year.

Only with Flexible Cash ISAs otherwise withdrawals count toward your allowance

Interest is calculated daily and paid out monthly.

Unfortunately, we don’t currently support Cash ISA transfers to XTB, but this service is coming soon. We do however currently permit transfers into our Stocks & Shares ISA.

We currently place client money within our Cash ISA into segregared Tier 1 banks under CASS rules, giving them full FSCS protection up to £120,000.

Please note that we do not charge an inactivity fee for ISAs.

Currerntly we hold Cash ISA funds at Tier 1 banks under CASS rules. Looking ahead, we may place client funds into one or more Qualifying Money Market Funds (QMMFs). Where this applies, your money will continue to be held in line with applicable regulations. Please see the ISA terms and conditions for more information.