Mandatory Disclosure Rules (MDR) were designed to give tax authorities early visibility into avoidance structures. But in practice, the regime has faced growing criticism—ranging from limited effectiveness to overreach and complexity.
In this episode, we break down the key concerns being raised by practitioners.
📉 1️⃣ Lack of Enforcement Outcomes
One of the most striking criticisms:
• No widely publicised cases
• No identified loopholes closed through MDR disclosures
• No meaningful enforcement against intermediaries
👉 This raises questions about whether MDR is delivering practical results or simply generating data.
🌍 2️⃣ Limited Global Participation
Although MDR is promoted by the
Organisation for Economic Co-operation and Development, adoption remains uneven.
Key issue:
• Only a limited number of jurisdictions (primarily the EU) actively apply MDR
This creates gaps where:
• Non-participating intermediaries can operate freely across borders
• Structures can be marketed outside MDR jurisdictions
⚖️ 3️⃣ Exclusion of Key Intermediaries
Ironically, some of the most important actors may fall outside reporting:
• Lawyers, due to legal professional privilege
• Intermediaries in non-MDR jurisdictions
👉 Result:
• The regime may miss primary designers or promoters of structures
📊 4️⃣ Overly Broad Scope
MDR’s definition of a “reportable taxpayer” is extremely wide.
In practice:
• Even potential clients may trigger reporting
• Promoters may need to report individuals who never proceed with a structure
👉 This creates:
• Administrative burden
• Reporting of hypothetical arrangements rather than real ones
⏳ 5️⃣ Retroactive Application Concerns
MDR rules can apply retroactively, in some cases dating back to October 2014.
This raises legal concerns:
• Potential conflict with ex post facto principles
• Reporting obligations imposed on past behavior
• Uncertainty for intermediaries who acted before rules were clear
🌐 6️⃣ Extraterritorial Reach
MDR attempts to apply across borders, including:
• Reporting obligations involving foreign intermediaries
• Disclosure requirements beyond domestic jurisdiction
Critics argue:
• Most legal systems limit extraterritorial reach to serious offences
• MDR extends this concept into tax compliance and reporting
🔗 7️⃣ Reporting the Entire Chain
MDR may require disclosure of:
• Upstream intermediaries
• Downstream intermediaries
• Clients and potential clients
—even where:
• No direct relationship exists
• No services were provided
👉 This creates practical and legal challenges, particularly around data access.
🔁 8️⃣ Ongoing Reporting Risk
Even dormant structures may trigger reporting:
• A structure designed years ago may become reportable if later reused
• Intermediaries may face obligations long after initial involvement
👉 This creates open-ended compliance exposure.
🪙 9️⃣ Scope Beyond Financial Accounts
MDR can apply to structures involving:
• Real estate
• Gold
• Chattels
• Operating businesses
👉 This goes beyond CRS, which focuses primarily on financial accounts.
⚖️ 10️⃣ MDR vs GAAR
Compared to traditional rules like the General Anti-Avoidance Rule (GAAR):
• MDR provides authorities with far broader information
• It focuses on disclosure, not just enforcement
👉 But more information does not always mean better outcomes.
🎯 Key Takeaway
Critics argue that MDR:
• Has limited enforcement impact
• Suffers from uneven global adoption
• Imposes broad and complex reporting obligations
• Raises concerns around:
- Retroactivity
- Extraterritorial reach
- Practical enforceability
At the same time:
MDR represents a shift toward
maximum transparency—even at the cost of complexity.