1. Corporate Tax Rate Increase: Introduction of the Defense Surtax
From fiscal year 2026, Japan will impose a 4% “Defense Surtax” on large corporations. This surtax is added on top of corporate income tax and applies to companies and foreign-owned subsidiaries that meet certain capital or revenue thresholds. This raises the effective tax rate in Japan. Companies in manufacturing, export trade, or planning to establish a Japanese entity must re-evaluate net profits, ROI periods, and post-tax dividend capacity.
2. Global Minimum Tax Implementation: Rising Top-Up Tax Risks
To align with the OECD tax reforms, Japan will fully implement the Global Minimum Tax (Pillar Two) from April 2026. Key mechanisms include:
• UTPR (Undertaxed Profits Rule): If a multinational’s profits in certain jurisdictions are taxed below 15%, other countries may claim top-up taxes.
•QDMTT (Qualified Domestic Minimum Top-Up Tax): Japan will prioritize collecting top-up tax domestically to reach the 15% minimum rate before other countries can claim it.
This poses risks for companies holding Japanese subsidiaries through low-tax jurisdictions like Hong Kong or Singapore, or retaining profits offshore. Corporate structures, profit allocation, and transfer pricing policies must be reassessed.
3. Key Impacts on Cross-Border Enterprises
• Reassessment of Investment Structures
Companies must evaluate whether it remains beneficial to hold Japanese investments through low-tax jurisdictions. After the reform, dividend repatriation costs and withholding tax risks may increase.
• Adjustments to Profit Repatriation and Cash Flow Management
The 4% surtax may reduce dividend distribution capacity of Japanese subsidiaries. Companies may shift from dividend payments to intragroup loans, service fees, or royalties to optimize cash repatriation.
• Supply Chain and Transfer Pricing Risks
For companies with R&D in China, manufacturing in Southeast Asia, and sales in Japan, profit allocation among jurisdictions will face higher scrutiny. Concentration of profits in low-tax regions may trigger top-up tax. Cost-sharing agreements and intercompany pricing models must be updated.
4. Recommended Corporate Actions
• Conduct tax simulations to assess the impact of the 4% surtax on profits and returns.
• Review holding structures, profit flows, and capital repatriation routes; consider establishing a Japanese holding company if needed.
• Reevaluate transfer pricing policies to comply with OECD standards & Global Minimum Tax requirements.
• Establish data systems for Global Minimum Tax reporting from 2026 onwards to avoid penalties and audit risks..
▲ Conclusion
Japan’s 2025 tax reform is not a single policy change but a systematic restructuring of corporate tax rates, international tax rules, and profit repatriation mechanisms. For multinational companies entering Japan or partnering with Japanese firms, this signals a shift towards a “high-transparency, high-regulation” era.
The earlier companies conduct tax simulations, optimize structures, and ensure compliance, the more they can reduce costs and avoid top-up tax risks. For businesses with cross-border supply chains or capital allocation needs, now is the best time to plan — before the new tax regime fully takes effect.
