The introduction of financial incentives for whistleblowers from April 2026 is likely to change how tax risks reach HMRC. While the department has long received tip-offs from employees, competitors and other connected parties, a clearer reward structure may increase both the volume and seriousness of disclosures.

For advisers and accountants, the significance lies less in the mechanics of the scheme and more in the possibility that concerns about historic tax positions may increasingly surface from within an organisation rather than through routine compliance activity.