Interest Limitation Rules: A Case Study and Policy Recommendation/Dunyang Chen

Interest Limitation Rules: A Case Study and Policy Recommendation

Dunyang Chen  

Interest limitation rules play a crucial role in international taxation, addressing the issue of thin capitalization. Thin capitalization occurs when companies use excessive debt financing to obtain additional interest deductions, thereby lowering their taxable base and potentially avoiding taxes. This practice is often referred to as “the problem of debt bias,” which can lead to non-funding neutrality and create significant tax disputes.

A recent and notable case that highlights the complexities of thin capitalization involves MLB, a Peruvian subsidiary of China Minmetals Corporation. In 2014, MLB utilized a financing package, including syndicated loans from Chinese banks (all of which are state-owned), to acquire a copper mine in Peru for $5.85 billion. The Peruvian tax authorities contended that the interest on these loans was not deductible because the loans were from related parties, and the debt-to-equity ratio exceeded the permissible 3:1 limit. The total amount of interest in question was approximately $1.9 billion over a three-year period, which posed a substantial financial and legal challenge for MLB.

The crux of the dispute centered on whether the loans from state-owned banks should be treated as related-party loans and whether these loans had a legitimate economic purpose. After years of legal battles, MLB ultimately prevailed in the case. This victory was not only significant for MLB but also prompted a review and revision of Peru’s thin capitalization rules.

Prior to 2021, Peru’s thin capitalization rule stipulated that if a company’s debt-to-equity ratio exceeded 3:1, interest paid to related parties would not be deductible. However, following the MLB case, Peru adopted a new rule based on EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization). This change was influenced by the G20/OECD BEPS (Base Erosion and Profit Shifting) project, which recommended the EBITDA rule as a best practice to prevent companies from shifting profits to low-tax jurisdictions. Although not a minimum standard, the EBITDA rule has proven to be more effective in protecting the tax base and aligns with the practices used by the European Union.

The EBITDA method offers several advantages over the traditional debt-to-equity ratio approach. It allows for adjustments based on different industries, recognizing that various sectors rely on capital and debt to different extents. For instance, in capital-intensive industries like mining, EBITDA is particularly useful. It is directly tied to cash flow, thus avoiding overly strict interest deductions that could impair a company’s ability to secure financing. By doing so, it helps protect the financing capabilities of these companies while ensuring that the tax base is not eroded. The EBITDA method can more accurately identify a company’s real profitability and debt-paying ability, making tax policies more aligned with the principle of economic efficiency.

In China, the current thin capitalization rules are still based on the debt-to-equity ratio. These rules focus on whether the debt is reasonable compared to equity but do not directly consider the company’s actual profits or taxable income. This approach may not be as effective in addressing the complexities of modern corporate financing and could potentially leave the tax base vulnerable to erosion through aggressive debt financing strategies.

Given the lessons learned from the MLB case and the benefits of the EBITDA rule, it is advisable for China to update its tax laws and incorporate the EBITDA rule into its thin capitalization regulations. This change would represent a significant step forward in enhancing the robustness of China’s tax system, ensuring that it is better equipped to address the challenges posed by complex international financing arrangements. By adopting the EBITDA rule, China can promote a more equitable and efficient tax environment, safeguarding the integrity of its tax base while supporting the sustainable growth of its enterprises.