CMC Invest Cash ISA now pays 3.95% AER interest
Account: CMC Invest Cash ISA
Description: CMC Invest is an excellent choice for savers as it has kept close to the top of the rate tables with a cash Individual Savings Account (ISA) offering a competitive interest rate of 3.95% AER (variable). The CMC Invest cash ISA can be opened through the investment app with as little as £1 in funds, with the variable interest rate calculated daily and paid monthly.
Is the CMC Invest Cash ISA any good?
CMC Invest’s Cash ISA offers a flexible and fairly competitive option for savers who want both access and decent interest, though it’s not without trade-offs. Its headline rate is 3.95% AER (variable), as of 10 September 2025.
This rate is lower than earlier promotional or higher-tier rates but still attractive compared with many other easy-access ISAs. The Cash ISA only requires £1 to open, allows you to withdraw and replace money within the same tax year without eating into your ISA allowance, and has no monthly fee (aside from a possible charge for urgent withdrawals). These features make it a good contender for those who like simplicity and flexibility, especially if they already use CMC Invest as an investment accounts.
However, if you just want the highest savings rate on a fixed term or locked savings rate, there may be other providers who beat it – Tembo, for instance, pays 4.1%. But, CMC Invest does also have a stocks and shares ISA where you could get significantly better returns in the stock market compared to what you’d earn in a savings account.
Is the CMC Invest Cash ISA Safe?
Yes – CMC Invest has taken steps to ensure the safety of customer funds, although money you put into this ISA isn’t protected by the Financial Services Compensation Scheme (FSCS) like it would be in a bank. CMC puts the money into a “qualifying money market fund” (QMMF). CMC describes this as “a type of fund that invests in low risk, high quality and highly liquid investments such as short-term assets like government bonds”.
The platform is regulated by the Financial Conduct Authority (FCA), meaning it must comply with rules about how client money is managed. Its ISA terms confirm that it is a flexible ISA, meaning that withdrawals and re-deposits within a tax year do not count against your annual allowance.
Overall, CMC Invest’s Cash ISA is a good choice for many who want a flexible, easy-access Cash ISA with a solid rate and minimal fuss, especially if you like having your savings and investments under one roof. It might not be the best choice if you only care about maximising rate for money you’re unlikely to touch.
Pros
- Also has an investment ISA
- Established provider
- Excellent rates and nous
Cons
- App-only product
- Bonus limited to 90 days
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Rates
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Flexibility
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App & Platform
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Customer Service
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Research & Analysis
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Overall
5
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