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Stocks and shares ISAs that 'behave' closer to cash

Journalist: Samantha Downes

ended 04. March 2025

Hi guys

Looking for some suggestions as to ISAs that allow investors to mimic cash more closely. Some of you gave me this idea last week. 

Much appreciated! Long responses welcome!

2 responses from the Newspage community

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The idea that a Stocks and Shares ISA can behave like cash is deeply flawed because a true cash-like investment cannot exist within this structure. By design, a Stocks and Shares ISA is an investment vehicle, not a savings product, meaning it inherently carries exposure to market fluctuations. Even if an investor selects a Money Market Fund or other ‘low-risk’ options, they will still experience daily price fluctuations and investment charges, making it fundamentally different from holding cash. Simply put, there is no risk-free way to replicate cash within a Stocks and Shares ISA, and any attempt to do so will inevitably result in some degree of volatility.
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With a substantial amount of cash remaining uninvested in S&S ISAs, in the current high-rate environment, this approach is actively eroding your portfolio’s returns. However, for those investors who want to hold a much higher percentage of cash, to preserve liquidity but avoid the drag of an oversized cash holding, there are more effective alternatives. Money Market Funds invest in highly liquid, short-term instruments such as government bonds and commercial debt, providing near-instant access to capital with better yields than traditional bank deposits. Additionally, Short-Duration Bond Funds invest in high-quality, short-term debt instruments, offering relatively stable returns with minimal interest rate risk. However, holding excessive cash comes with inherent risks, particularly in a high-inflation environment. Our global multi-asset portfolio holds a 2.1% cash weighting to reflect this, ensuring our capital is working optimally, rather than languishing in a low-yielding reserve.