Answers · UK 2025/26
Should I choose a Cash ISA or Stocks & Shares ISA?
Cash ISA: guaranteed interest, FSCS protected, no risk — best for emergency fund or savings goals under 5 years. Stocks & Shares ISA: higher long-term returns historically (~5% real), but value can fall — best for 10+ year goals like retirement.
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UK Cash ISA vs Stocks & Shares ISA decision framework. Cash ISA — fixed or variable interest rates, FSCS protection to £85,000 per provider, instant or fixed-term access. Best for: emergency funds, savings goals under 5 years, low-risk preference. 2025 best-buys typically 4.0-4.8% AER. Stocks & Shares ISA — invest in funds, ETFs, individual shares; value fluctuates with markets. Long-term UK equity real returns averaged ~5% real over 100+ years (Barclays Equity Gilt Study). Best for: retirement savings, university funds, any 10+ year horizon. Below 5 years horizon: stocks risk losing money over the period. The £20,000 annual ISA allowance can split across both. Common rule of thumb: emergency fund (3-6 months expenses) in cash; everything else for long-term goals in S&S. Lifetime ISA can wrap either type. Innovative Finance ISA (P2P lending) is higher-risk than cash, lower-return potential than equities — niche use.
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This answer is informational only and does not constitute financial, tax or legal advice. Figures are for the 2025/26 UK tax year. See our methodology and sources.