Julia Chirkova
In a significant development for international tax enforcement, officials from the U.S. Internal Revenue Service (IRS) and Her Majesty’s Revenue and Customs (HMRC) of the United Kingdom have announced a strengthened collaboration aimed at identifying and prosecuting global tax evasion. This partnership leverages the expertise and established frameworks of both nations’ whistleblower programs, signaling a robust commitment to cross-border compliance and the pursuit of financial integrity on a global scale.
The core of this enhanced cooperation lies in the shared objective of incentivizing individuals to come forward with credible information regarding serious tax avoidance and evasion. The HMRC’s "Strengthened Reward Scheme," launched in November 2025, was notably developed with significant input from the IRS Whistleblower Office. This echoes the IRS’s own successful program, which has been instrumental in recovering billions of dollars in unpaid taxes by rewarding those who provide actionable intelligence. Both programs are specifically designed to target complex schemes perpetrated by the wealthiest individuals and the largest corporate entities, areas often most susceptible to sophisticated tax evasion tactics.
IRS CEO Frank Bisignano underscored the importance of this bilateral effort in a statement issued on October 7th. "The collaboration between the U.S. and the U.K.’s whistleblower program will help deter large-scale, cross-border tax evasion," Bisignano stated. "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." His remarks highlight the strategic intent behind the partnership: to create a deterrent effect and foster a more accountable global financial environment.
The synergy between the IRS and HMRC extends beyond the initial development of the HMRC’s reward scheme. Both agencies have reaffirmed their dedication to working collaboratively with whistleblowers, recognizing their critical role in uncovering threats to global financial security and tax compliance. This commitment to rewarding those who provide "specific, timely, significant, and credible information" about suspected violations of tax laws is central to the success of both programs.
For individuals in the United States possessing such information, reporting channels are available through the IRS Whistleblower Office and IRS.gov/SubmitATip. In the United Kingdom, whistleblowers can utilize the "Reporting Serious Tax Avoidance or Evasion" portal on Gov.UK. The cross-border nature of the collaboration means that individuals do not need to be citizens or residents of either country to be eligible for a monetary award, provided their information leads to the successful collection of taxes or other financial proceeds. This inclusive approach broadens the potential pool of informants and reinforces the global reach of the initiative.
The genesis of this intensified collaboration can be traced back to the IRS’s pioneering work in establishing its own Whistleblower Office. Since its inception, the IRS program has been a significant revenue generator for the U.S. Treasury. Data from the IRS indicates that from its inception through fiscal year 2023, the IRS Whistleblower Program has awarded over $1.4 billion to whistleblowers, leading to the collection of more than $6.7 billion in taxes, interest, penalties, and other amounts. This track record of success provided a compelling model for other tax authorities seeking to enhance their own enforcement capabilities.
HMRC Chief Executive JP Marks expressed his satisfaction with the ongoing partnership. "I’m pleased to join the IRS in recognizing the important role that informants play in helping protect the integrity of our tax systems," Marks stated. "The IRS has played an important role in supporting the development of HMRC’s Strengthened Reward Scheme, and I am grateful for the close collaboration between our organizations. By working together, we can strengthen our efforts to tackle tax avoidance and evasion." Marks’ statement emphasizes the mutual benefit and the shared commitment to integrity that underpins this alliance.
The practical implications of this collaboration are far-reaching. Tax evasion and avoidance, particularly on a global scale, represent a substantial drain on public finances. These illicit activities not only deprive governments of essential revenue needed for public services but also create an uneven playing field for honest taxpayers and legitimate businesses. The International Monetary Fund (IMF) has estimated that the global tax gap – the difference between the taxes legally owed and those actually paid – could be in the trillions of dollars annually, with a significant portion attributed to cross-border transactions and offshore tax havens.
The IRS and HMRC’s coordinated effort is a direct response to the increasing complexity of international financial structures, which can be exploited to conceal assets and income. By sharing intelligence and coordinating investigations, the two agencies can more effectively follow the money trail across borders, dismantle complex evasion schemes, and bring perpetrators to justice. This is particularly relevant in an era of digital finance, cryptocurrencies, and intricate corporate ownership structures, which can present significant challenges for traditional tax enforcement methods.
The IRS Whistleblower Office, established under Section 7623 of the Internal Revenue Code, operates under strict guidelines. It processes claims from individuals who report information about tax fraud or other violations. Awards are typically a percentage of the collected proceeds, ranging from 15% to 30%, depending on the extent to which the whistleblower’s information contributed to the recovery and the nature of the proceedings. Similar principles are understood to be in place for HMRC’s Strengthened Reward Scheme, though specific award percentages may vary.
The strategic importance of this alliance can also be viewed within the broader context of international efforts to combat financial crime and promote tax transparency. Organizations like the Organisation for Economic Co-operation and Development (OECD) have been instrumental in developing frameworks for information exchange and combating base erosion and profit shifting (BEPS). The IRS-HMRC collaboration complements these broader international initiatives by providing a practical, enforcement-focused mechanism for identifying and addressing non-compliance.
The types of information that whistleblowers are encouraged to report are broad and encompass a wide range of illicit activities. While the original article did not detail specific examples in its provided text, generally, such reports can include instances of undeclared offshore accounts, sham corporations used to hide income, aggressive tax avoidance schemes involving artificial transactions, or insider knowledge of large-scale tax fraud by corporations. The emphasis is on information that is actionable and likely to lead to a significant recovery of tax revenue.
The success of whistleblower programs hinges on several key factors: clear reporting mechanisms, robust protection for whistleblowers against retaliation, and a demonstrated commitment to investigating and acting upon credible information. The IRS and HMRC appear to be addressing these factors through their formalized programs and public statements. The explicit encouragement for individuals to come forward, coupled with the promise of rewards, aims to overcome the potential reluctance or fear that informants might otherwise experience.
Looking ahead, this strengthened partnership between the IRS and HMRC is likely to serve as a model for further international cooperation in tax enforcement. As global financial markets become increasingly interconnected, the ability of national tax authorities to collaborate effectively will be paramount in maintaining the integrity of tax systems worldwide. The proactive approach of leveraging whistleblower programs, a proven method for uncovering hidden tax liabilities, signals a determined effort by both nations to stay ahead of sophisticated tax evaders and to ensure that all individuals and entities contribute their fair share to public finances. The fight against international financial fraud is a complex and ongoing battle, and this alliance represents a significant tactical advancement.
The visual elements accompanying the original article, featuring images of IRS CEO Frank Bisignano and HMRC Chief Executive JP Marks, underscore the leadership commitment to this initiative. Their presence lends a face to the policy, reinforcing the seriousness with which both agencies are approaching this critical area of enforcement. The inclusion of logos and calls to action for registration and login suggest that this information is part of a broader content strategy aimed at engaging tax professionals and businesses, likely by offering deeper insights, analysis, or resources related to international tax compliance and whistleblower programs.
