HMRC has announced that starting in 2027 new tax rules will apply to stocks-and-shares ISAs. The changes will tighten the current framework and could diminish the appeal of ISAs. Industry experts warned that the revisions bring new tax implications for households. Leading investment platforms have noted that the tighter cash limits may discourage saving. The government is reviewing allowance rules as public scrutiny grows. Investors are urged to reassess portfolios before the changes take hold.