One Cash ISA, multiple banks.

You can open an ISA if you’re over the age of 18 and have a National Insurance number. You must be resident in the UK. For more details on ISA eligibility, visit HMRC’s website.

All Flagstone accounts require a minimum deposit of £10,000 to open. You can spread this between your non-ISA savings and your Cash ISA as you wish, provided you don’t exceed your annual ISA allowance.

WealthKernel is a UK-regulated financial services company that provides the reporting infrastructure underpinning the Flagstone Cash ISA.  

While you’ll open and access your Cash ISA through the Flagstone platform, WealthKernel acts as the ‘Cash ISA manager’. It provides essential services like account setup and regulatory reporting. Your money is held with FSCS-eligible UK  banking groups that you choose through the Flagstone platform.

When you open a Cash ISA with Flagstone, you’ll need to agree to both our terms and WealthKernel’s, so that we can provide all the necessary services for your Cash ISA. 

WealthKernel is authorised and regulated by the Financial Conduct Authority (FCA).

As Cash ISAs provide a way for you to earn interest tax-free, we’re legally required to keep your savings and ISA funds separate. This ensures accurate reporting to HMRC, which grants us the licence to operate this service.

When you join Flagstone, you’ll get two holding accounts: one for your savings and one for your ISA savings. You can move money between the two.

Yes. Until 06 April 2027, you can use your entire annual tax-free allowance to fund a Cash ISA if you wish. This means you can contribute a maximum of £20,000 before this date.

After 06 April 2027, your maximum contribution to Cash ISAs will reduce to £12,000. If you’re over 65 the reduction in the annual allowance doesn’t apply to you. This means you can continue to save as usual for as long as you like.

Yes. You can open multiple Cash ISAs if you wish. This usually means opening one account at a time manually, with each one managed by individual providers. This makes it complicated to keep track of your savings, especially if you’ve been saving for many years.

Opening a Cash ISA with Flagstone allows you to consolidate your savings in one place, with access to exclusive rates from range of banks. You can move your savings between accounts to take advantage of our best Cash ISA rates without leaving the platform.

You must request that we make the transfer on your behalf. If you withdraw your funds from a Cash ISA and attempt to move the money yourself, you may use up your annual allowance as HMRC will register this activity as a new contribution.

The £20,000 annual contribution limit applies to all account types until 06 April 2027. This means you can add a maximum of £20,000 to any combination of ISAs before then. After this date, your annual allowance for Cash ISAs will reduce to £12,000 a year unless you’re over 65 years old.

You can transfer balances you’ve built up in other Cash ISAs over a handful of years without a penalty, provided you follow the right steps.

If you exceed your maximum contribution, the excess funds will be moved into your savings holding account. We’ll always email you if this happens.

While cash is in your savings holding account, it won't earn you interest.