HMRC has announced that starting in 2027 new tax rules will apply to stocks-and-shares ISAs. The changes will restrict existing allowances 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 harsher restrictions may deter investors. The government is reviewing allowance rules as debate intensifies. Investors are urged to reassess portfolios before the changes take hold.