HM Revenue and Customs (HMRC) confirms it will introduce a 22% tax charge on cash interest held inside Stocks and Shares Individual Savings Accounts (ISAs) from 2027. The measure is intended to prevent ISA savers from using cash holdings within Stocks and Shares ISAs to avoid the impact of new rules being introduced as part of changes to the ISA regime. Multiple outlets report that HMRC plans to bring in additional rules alongside the charge to ensure the policy meets its stated objective. Coverage also highlights that the policy faces criticism and backlash from parts of the financial services industry, which argues the approach could affect savers and is likely to be operationally complex. While the precise implementation details are not described uniformly across reports, the central point agreed across sources is the confirmed introduction date and the tax rate applied to cash interest within Stocks and Shares ISAs. Overall, the reporting frames the change as a compliance-focused reform aimed at closing perceived loopholes rather than altering the broader purpose of ISAs.