Customers will be able to earn up to 2.30% fixed interest paid annually on a three-year account with one initial deposit.

Highlights of these accounts include:

One-year fixed save

• during the first year customers can earn 1.80% interest, which will be paid into their linked current account on the anniversary of the date the first payment was made
• the customer must open the account with over £1,000, and could earn a minimum of £18 in interest after 12 months.

Two-year fixed saver

• after two years customers can earn 2.10% interest, which will be paid into the linked current account on the anniversary of the date the first payment was made
• the initial deposit must be over £1,000, and could earn a minimum of £42 in interest after 24 months.

Three-year fixed save

• after three years customers can earn 2.30% interest, which will be paid into the linked current account on the anniversary of the date the first payment was made
• based on a £1,000 deposit, customers can earn £69 in interest after 36 months.

Customers cannot withdraw any money from a fixed saver account until the end of the product term.

David Goodwin, product manager at Tandem, said: “We're shaping a suite of products that serve as solutions to real problems that people struggle with every day.

“Tandem is a bank that helps customers better manage their money, and these savings accounts are a way for people to see guaranteed returns on their cash.”

Ricky Knox, CEO at Tandem (pictured above), added: “It's been a long wait for us and we're excited to finally share these accounts with the public.

“We've got big ambitions for 2018 and are off to a fantastic start.”