Cash ISA
Easy-access
Atom Bank Cash ISA
interest rate
£20,000
maximum per year
by WInvest
Who is Atom Bank?
Atom Bank is a UK digital-only bank focused on savings and lending products, delivered through a mobile app. It offers a range of competitive savings accounts, including easy-access and fixed-rate options, as well as mortgages, all with a simple app-first experience. Savings with Atom Bank, including Cash ISAs, are protected by the UK Financial Services Compensation Scheme (FSCS) up to eligible limits.
Pros and cons
- Pros
- Competitive variable interest rate (e.g., around 4.25% AER) on easy-access ISA balances, helping maximise tax-free earnings
- Unlimited access, meaning you can withdraw funds whenever you need them, without notice or penalty
- No minimum deposit and straightforward account opening and management via the Atom Bank app
- Cons
- Not a flexible ISA—if you withdraw money, you can’t replace it without using more of your current year’s ISA allowance
- Cannot currently accept transfers in from ISAs held with other providers; you can only fund it from a connected UK current account
- Interest is variable and can rise or fall at any time in response to market conditions
What is a Cash ISA?
A Cash ISA is a savings account where all interest you earn is completely tax-free. Every UK resident aged 18 or over gets an annual ISA allowance at the start of each tax year. For the 2025/26 tax year (ending 5 April 2026), the allowance is £20,000, and from April 2027 it will reduce to £12,000. Cash ISAs come in different types, including easy-access accounts and fixed-term accounts.
What is an easy-access Cash ISA?
An easy-access Cash ISA allows you to withdraw your money whenever you need it, without paying any penalties. The interest rate is variable, so it can rise or fall over time. Some easy-access ISAs are also flexible, meaning withdrawn money can be replaced without affecting your allowance.
Who is Atom Bank Cash ISA good for?
The Atom Bank Cash ISA (easy access) is a good choice for savers who want tax-free interest combined with instant access to their money and a competitive rate compared with many high-street alternatives. It’s especially suited to people comfortable managing accounts via an app and who aren’t looking for flexible replacement rules—ideal for building an emergency fund or short-to-medium-term savings goals. However, it may be less attractive to those who want flexible ISA features or ISA transfer-in options.
WInvest Rating
4.8 ★★★★★
5.0 ★★★★★
Recommend 100%
My husband recommended Atom a few years ago and since then I have not invested with anyone else. The money is transferred immediately and generally very easy to open accounts and top them up. Only thing I hate is the App doesn’t work in landscape mode on an iPad which is frustrating.
5.0 ★★★★★
I needed to move money out of my 1 year fixed account into my connecting account then put it back into a flexible ISA. In the run up to this Atom provided excellent communication advice and alternative options for this transaction. Needless to say it went very smoothly without any problems.
4.0 ★★★★
Atom Bank’s app is incredibly easy to use and made opening and managing my savings a breeze. The competitive rates and smooth digital experience have made me a very satisfied customer!
5.0 ★★★★★
Definitely recommend
I have now had two fixed savings accounts with Atom and wouldn’t hesitate to use them again. I was attracted by the competitive interest rates but have used them again because their app is so easy to use giving clear instructions, information and updates. Definitely recommend!
5.0 ★★★★★
So glad I discovered Atom
So glad I discovered Atom. Their app is so easy to navigate & use. The products they have are clearly explained, offer flexibility & I really like that they offer short term fixed savings accounts.
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Cash ISA
Easy-access
Minimum deposit
Maximum allowance
£20,000 per year
How to open?
Interest paid
Is flexible?
To Note
- No transfers in