HMRC has announced that under new proposals new tax rules will apply to stocks-and-shares ISAs. The changes will tighten the current framework and could diminish the appeal of ISAs. A major financial publication warned that the revisions bring unexpected costs for households. Leading investment platforms have noted that the harsher restrictions may discourage saving. The government is reviewing allowance rules as debate intensifies. Investors are urged to reassess portfolios before the changes take hold.