In April 2026, the U.S. Treasury Department’s Office of Foreign Assets Control (OFAC) issued new guidance on sanctions evasion, signalling a notable evolution in how sanctions compliance is understood and enforced. While the long-standing “50% Rule” remains formally intact, regulators have made it clear that relying solely on this rule is no longer sufficient. The shift reflects a broader and more nuanced approach to identifying sanctioned entities and hidden economic interests.
The phrase “The 50% Rule is dead; long live the 50% Rule” captures this transformation. The rule itself has not been abolished. Instead, its role has changed, from being the central test of compliance to just one element within a wider and more complex due diligence framework.
Understanding the Traditional 50% Rule
The 50% Rule has long been a cornerstone of U.S. sanctions enforcement. Under this rule, any entity that is owned directly or indirectly, 50% or more, in aggregate, by one or more sanctioned individuals is itself treated as a sanctioned entity.
This principle applies even if the entity is not explicitly listed on OFAC’s Specially Designated Nationals (SDN) list. As a result, businesses must look beyond official lists and examine ownership structures to determine whether a counterparty is effectively blocked.
Historically, the rule functioned as a clear, bright-line standard. Compliance teams could rely on ownership percentages to determine whether an entity was subject to sanctions. If sanctioned persons collectively owned 50% or more, the entity was blocked; if not, it was generally considered permissible to engage with.
However, this clarity also created limitations. The rule focused strictly on ownership, not on control, influence, or hidden economic interests.
Why the Rule Is No Longer Enough
Over time, sanctioned individuals and entities have adapted. Rather than maintaining obvious ownership stakes, they increasingly use complex legal structures, intermediaries, and proxies to obscure their involvement. These arrangements often fall below the 50% threshold while still allowing sanctioned parties to retain significant control or benefit.
Recognising this shift, OFAC has begun emphasising that formal ownership is only one indicator of sanctions risk. The agency now expects companies to consider the broader context of a transaction, including who ultimately benefits from or controls an entity.
The 2026 guidance explicitly encourages firms to look “beyond legal formalities to underlying practical and economic realities.”
This marks a clear departure from a purely rules-based approach toward a more substance-based evaluation.
Key Enforcement Trends Driving the Change
Recent enforcement actions illustrate how OFAC is applying this broader perspective in practice. These cases demonstrate that even when the 50% ownership threshold is not met, sanctions violations may still occur if a sanctioned individual retains influence or economic interest.
One significant case involved a U.S. venture capital firm that continued managing investments linked to a sanctioned Russian oligarch. Although legal advice suggested that the investment structure did not meet the 50% ownership threshold, OFAC determined that the sanctioned individual still had a property interest and influence over the investment.
In another case, a fiduciary managing a trust connected to a sanctioned individual relied on legal advice stating that the trust was not blocked. However, regulators found that the sanctioned person continued to exert control over decisions, indicating an ongoing property interest.
A separate enforcement action involving a private equity firm revealed a similar pattern. Even though the sanctioned individual did not formally own a majority stake, evidence showed that he was the source of funds and retained decision-making influence. This was sufficient for OFAC to conclude that sanctions obligations had been violated.
These cases collectively highlight a critical point that compliance cannot depend solely on formal ownership percentages.
Control, Influence, and Hidden Interests
One of the most important developments in the new guidance is the recognition that control and influence can be as significant as ownership.
While the 50% Rule technically applies only to ownership, enforcement actions now consider whether a sanctioned person:
- Exercises decision-making authority
- Provides funding or retains financial benefits
- Uses proxies or intermediaries to mask involvement
- Maintains ongoing relationships that indicate influence
Even without a majority stake, these factors may indicate that an entity is effectively controlled by a sanctioned party.
Additionally, OFAC has underscored the risks associated with trusts and similar arrangements. Such structures can obscure beneficial ownership and make it difficult to identify the true parties in interest. As a result, they require heightened scrutiny.
The Limits of Legal Opinions
Another key takeaway from recent enforcement actions is that legal opinions alone do not guarantee compliance.
In multiple cases, companies relied on external legal advice stating that certain entities were not blocked under the 50% Rule. Despite this, OFAC imposed penalties after determining that the companies had sufficient knowledge or should have had sufficient knowledge of the sanctioned party’s involvement.
This reinforces the expectation that businesses must go beyond formal legal assessments and consider the full factual context. If there are warning signs or inconsistencies, reliance on legal advice may not be sufficient to avoid liability.
Red Flags and Risk Indicators
The evolving enforcement approach places greater importance on identifying red flags that may signal hidden sanctions risks. These include:
- Complex ownership structures with multiple layers
- Use of intermediaries or nominee shareholders
- Sudden changes in ownership following sanctions designations
- Continued involvement of previously sanctioned individuals
- Financial arrangements that suggest indirect benefit
When such indicators are present, companies are expected to conduct deeper investigations rather than relying on surface-level compliance checks.
Implications for Businesses
The shift in OFAC’s approach has significant implications for companies engaged in international business.
Enhanced Due Diligence
Businesses must now conduct more comprehensive due diligence that goes beyond ownership percentages. This includes analysing control structures, funding sources, and relationships between parties.
Holistic Risk Assessment
Compliance programs must evaluate the overall context of transactions. This means considering patterns of behaviour, historical relationships, and economic realities, not just formal documentation.
Greater Accountability
Companies can no longer rely on technical compliance alone. If they ignore warning signs or fail to investigate suspicious arrangements, they may face enforcement action.
Increased Compliance Costs
The need for deeper analysis and monitoring will likely increase compliance costs. However, this investment is essential to mitigate legal and reputational risks.
A Broader Philosophy of Enforcement
The transformation of the 50% Rule reflects a broader shift in regulatory philosophy. Rather than relying on rigid thresholds, regulators are focusing on substance over form.
This approach recognises that modern financial systems are complex and adaptable. Sanctioned actors can exploit legal loopholes and technical definitions to evade restrictions. By emphasising real-world economic relationships, regulators aim to close these gaps.
In essence, compliance is no longer a “check-the-box” exercise. It requires judgment, vigilance, and a willingness to question formal structures.
The 50% Rule remains a fundamental part of U.S. sanctions law, but its role has changed significantly. It is no longer the definitive test of whether an entity is sanctioned. Instead, it serves as a starting point, a baseline for analysis.
The new guidance makes it clear that businesses must adopt a more comprehensive and realistic approach to sanctions compliance. Ownership thresholds alone are insufficient; control, influence, and economic benefit must also be considered.
In this sense, the 50% Rule is both “dead” and very much alive. It continues to exist, but within a broader framework that demands deeper scrutiny and greater responsibility. For companies operating in a global environment, adapting to this shift is not optional, it is essential for avoiding risk and ensuring compliance in an increasingly complex regulatory landscape.
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