The Internal Revenue Service announced it is collaborating with His Majesty's Revenue and Customs, the British tax authority, to coordinate efforts against international tax evasion through their whistleblower programs.
The British program, called the Strengthened Reward Scheme, was established in November 2025 to encourage reports of serious tax avoidance and evasion involving the wealthiest individuals and largest businesses. The IRS supported the development of the program.
Tax avoiders increasingly use sophisticated methods involving offshore accounts, shell companies, and fraudulent transfers split across multiple jurisdictions to evade detection. Whistleblowers are critical to uncovering these schemes, allowing tax authorities to identify violators and ensure tax compliance, the IRS said.
"By working together, the two tax authorities encourage robust tax enforcement on both sides of the Atlantic and will have a far-reaching global impact in the fight against international financial fraud," said IRS Chief Executive Officer Frank J. Bisignano.
Individuals with information about suspected tax violations can report to the IRS through the Whistleblower Office or IRS.gov/SubmitATip, or to HMRC through Reporting Serious Tax Avoidance or Evasion on GOV.UK. Whistleblowers may qualify for monetary awards when their information leads to tax collection and do not need to be citizens or residents of either country to receive an award, the agencies said.