A quiet revolution is unfolding in the world of investment platforms. Once criticized for offering negligible returns on uninvested cash, platforms are now advertising interest rates of 4% or more. But how are they managing to offer such high returns—and can investors trust this new generosity?
The Rise of the Cash Yield Wars
Investment platforms are now engaged in a pricing war, competing for customers by offering higher rates on uninvested cash within ISAs and self-invested personal pensions (SIPPs). Just a few years ago, uninvested cash earned next to nothing due to record-low interest rates. Today, platforms are promoting yields that rival or exceed traditional savings products.

The Role of Liquidity Tools and Money Market Funds
The key driver behind these attractive returns lies in liquidity-enhancing tools, particularly money market funds (MMFs). These funds pool investor money to buy short-term, low-risk debt such as government bonds. When deemed “qualifying” (QMMFs), they can be used within cash ISAs, allowing platforms to generate better yields from client cash without compromising liquidity.

Real-World Examples of Platforms and Rates
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Trading 212 offers 4.6% on uninvested ISA cash, paid monthly.
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Netwealth’s Liquidity Reserve Portfolio yields 4.5%, backed by MMFs and ultra-short bonds.
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Hargreaves Lansdown, by contrast, offers between 2.3% to 3.15% for ISA cash, and less for general accounts.
What Makes MMFs Appealing?
QMMFs are strictly regulated under EU guidelines, ensuring daily liquidity even during periods of market stress. They are typically composed of high-quality assets with short maturities (less than 397 days), and are designed to maintain capital stability.

Popular MMFs include:
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BlackRock ICS Sterling Liquidity Fund: AAA-rated, yields just under 4.5%, with a 0.10% fee.
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Goldman Sachs Sterling Liquid Reserves: Holds £13 billion in assets, yields 4.41%.
These funds often invest in:
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Certificates of deposit (CDs)
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Repurchase agreements (repos)
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Government bonds
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Commercial paper
Are There Risks?
While MMFs are typically stable and liquid, they are not covered by the Financial Services Compensation Scheme (FSCS). Some risk of capital loss exists, such as during the 2008 financial crisis when one fund repaid only 97 cents per share. Additionally, returns fluctuate with interest rate movements, and slight deviations in daily fund pricing are possible.
What Should Investors Look Out For?

Jack Stockdale from Killik and Co. recommends focusing on:
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Credit strength of issuers
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Liquidity of underlying instruments
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Fund size and credit ratings
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Management reputation
He also suggests comparing MMF yields with ultra-safe government bonds, which may offer capital gains and tax advantages for higher-rate taxpayers.
Conclusion
Investment platforms have found a powerful way to boost returns on idle cash using MMFs and other liquidity tools. While the rates may seem unusually generous, they are backed by time-tested financial structures. Still, as with any investment, understanding the risks and choosing reliable providers remains essential.
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