CMC Invest, the share trading and investment app owned by CMC Markets, pays 2% interest on unencumbered cash balances held in client accounts.
2% interest on cash balances
CMC Invest offers customers a 2% gross interest rate (2.02% AER) on all uninvested, settled cash held across any of its investment accounts, including General Investment Accounts (GIA), Cash ISAs, Flexible Stocks & Shares ISAs, and SIPPs. Interest is calculated daily and paid monthly, with no fixed term, upper limit, or minimum balance requirements—whether you hold £50 or £50,000 in cash.
The interest is available across all plans:
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Core Plan: £0/month (always free)
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Plus Plan: Free for 3 months (then up to £10/month)
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Premium Plan: Free for 12 months (then up to £25/month)
Interest is only paid on settled cash, which refers to funds that have cleared and are available for withdrawal or reinvestment. Interest payments are made within 10 business days after the end of each month and can be invested immediately upon credit.
Tax treatment depends on the type of account. Interest earned within an ISA or SIPP is tax-free. Interest in a GIA may be taxable if it exceeds your personal savings allowance. A Consolidated Tax Certificate is issued annually for GIA accounts.
The interest rate is variable and may change; updates will be provided via the app and website. Interest is paid gross (without tax deducted), and the AER includes the effect of monthly compounding.
This feature supports a flexible investment approach, allowing customers to earn while they decide where to invest. The service is FCA regulated and FSCS protected, with CMC Invest part of a FTSE 250 group.
- Related guide: Our expert CMC Invest review and ratings
Where can you get the most interest on your uninvested cash on deposit?
Not all brokers and investment platforms pay deposit interest, for example, Dodl, which is owned and operated by AJ Bell, currently pays zero per cent on free cash balances.
If you do have larger uninvested cash balances, there are better homes out there for your money, you can compare the best interest rates for uninvested cash here.
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