Amid fears of changes to tax-free ISAs in the upcoming Budget, Britons are rushing to maximise their savings in these accounts. Concerns stem from remarks by Rachel Reeves, who previously suggested a cap of £500,000 on tax-free ISAs, sparking fears that she might target ISAs for a tax raid. As a result, investments in stocks and shares ISAs have surged; one provider reported a 156% increase in contributions in September compared to the same period last year. The number of ISA millionaires has tripled in three years, with over three thousand holding more than £1 million in their ISAs, and thousands more nearing that figure. Analysts credit this growth to the power of compounding and investing in stocks and shares rather than just relying on cash ISAs. Proposed changes could reduce the £20,000 annual contribution limit or introduce a cap, worrying investors seeking to save for their future amid an increasingly taxed environment.