Tandem Unveils New Portfolio Cash ISA – Smarter, Simpler and More Flexible

Tandem Bank has today launched its new Portfolio Cash ISA, giving customers a smarter, simpler and more flexible way to save tax-free.

The Portfolio Cash ISA brings together instant access and fixed-rate ISAs under one easy-to-manage portfolio, allowing customers to tailor savings to their needs. Savers can open up-to 20 ISAs, across any combination of instant access and fixed term accounts, offering flexibility or guaranteed returns.

A smarter, simpler, and more flexible solution built around customer needs

The new Cash ISA has been designed with customers, for customers, offering:

• Combined instant access and fixed-rate accounts in one portfolio for seamless transfers between accounts
• Fully flexible ISA functionality – withdraw and replace funds in the same tax year without losing any of the £20,000 allowance
• Save up to £250,000 across up to 20 ISAs
• Monthly tax-free interest paid into each ISA
• Quick and easy to instruct a transfer of other provider ISAs within the app
• 14-day window to fund fixed-rate ISAs, giving customers time to manage money
• Handy allowance reminders before and after the tax year
• Manage everything easily in the award-winning Tandem app, with no paper forms or calls needed and an onboarding journey that gets even simpler once the first ISA is opened
• Access to Additional Permitted Subscriptions, enabling customers who lose a partner to access their ISA allowance

The new product directly responds to customer demand, with a Cash ISA being the most requested product in Tandem’s 2025 customer survey. Throughout development, focus was on customer need, as well as ensuring a clean, simple design and accessible language – making the ISA process straightforward for every customer, regardless of background or financial experience.

Tom Ellmers, Savings Director at Tandem, said: “Our customers told us they wanted a Cash ISA that’s as flexible and easy to use as their everyday accounts – so we built just that. The Tandem Cash ISA puts savers in control, helping them make the most of their tax-free allowance minus the complexity.”

Rachel Springall, Finance Expert at Moneyfactscompare.co.uk, said: “Cash ISAs are incredibly popular with savers who want to protect their hard-earned cash from tax, but with varying terms, not one type fits all.

“Tandem Bank has created an ISA which will give consumers a simple way to hold different types within its portfolio, ideal for savers who want the comfort of quick access to funds, or for a portion of the money to work harder in a fixed rate ISA. It is worth pointing out that not every cash ISA provider on the market offers the option to split multiple types of cash ISAs under its umbrella, so it’s great to see Tandem cater to customer demand.”

Since April 2024, savers have been able to pay into multiple Cash ISAs across providers in a single tax year. Tandem has set out to make this clearer for consumers by showing that they can have multiple ISAs if they stay within the £20,000[1] annual allowance and £250,000 total balance across their Tandem portfolio.

With the Cash ISA market valued at around £360bn[2] and following the recent Budget and pending changes announced by the Government, Tandem is keen for customers to do as much as possible to take control of their finances – taking positive steps to save and making the most of the current allowances available to them.

It marks yet another milestone for Tandem, which under its new leadership has moved to have a real focus delivering customer value while supporting a greener future. It builds on Tandem’s track record of offering straightforward, competitive savings, which saw the bank collect top spot for both Best Customer Service and App-only Savings Provider of the Year at the Moneyfactscompare.co.uk Awards.

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