Recent developments in Japan and Korea indicate a significant intensification of tax enforcement, driven by digital tools and a focus on cross-border transactions. Professionals must note critical shifts in audit procedures, the application of economic substance principles, and heightened risks in specific industries.
Japan: Data-Driven Scrutiny and Procedural Shifts
The Japanese National Tax Agency (NTA) is leveraging advanced analytics to enhance audit efficiency and revenue yield, particularly in international tax matters.
Key Developments & Practical Implications:
- Digital Audit Transformation:
- Development: The NTA is institutionalizing digital audits, utilizing platforms like Microsoft Teams and secure government cloud services for meetings and data exchange. The option for digital audits is becoming more widely available from September 2025.
- Impact & Practical Issue: This increases the speed of audits and demands that taxpayers have robust, readily accessible digital record-keeping systems. The ability to quickly compile and transmit electronic data is now a critical component of audit readiness.
- Enhanced Scrutiny on Intangibles and Transfer Pricing:
- Development: The NTA is using its Kokuzei Sogo Kanri (KSK) system to perform risk assessments, focusing on intellectual property transactions, profit splits, and the valuation of intangible assets. Transfer pricing audits are frequently conducted separately from corporate tax audits.
- Impact & Practical Issue: This segregated approach necessitates dedicated preparation for transfer pricing reviews. Companies must ensure their local files and master files are robust, with contemporaneous documentation supporting valuation methodologies for intangibles.
- Compliance and Fraud Focus:
- Development: There is increased monitoring of foreign companies liable for Japanese Consumption Tax (JCT) and rigorous verification of large JCT refund claims to combat fraud.
- Impact & Practical Issue: Entities claiming significant JCT refunds should pre-emptively ensure their invoice and transaction data is impeccable to withstand scrutiny and avoid protracted disputes.
- Critical Procedural Consideration:
- Development: Japan does not recognize attorney-client privilege to the same extent as common law jurisdictions.
- Impact & Practical Issue: Communications with tax advisors may be subject to disclosure. Engaging legal counsel early in the audit process is crucial to define the scope of information requests and protect sensitive communications.
Korea: AI-Enabled Enforcement and Substance-Over-Form
The Korean National Tax Service (NTS) is pursuing an aggressive audit strategy, funded by recent tax rate increases and powered by artificial intelligence to target perceived avoidance.
Key Developments & Practical Implications:
- AI-Driven Risk Assessment and Data Collection:
- Development: The NTS employs AI for risk-based audit selection, enhancing its use of forensic digital investigations, dawn raids, and Exchange of Information (EOI) treaties.
- Impact & Practical Issue: The threshold for triggering an audit has lowered. MNEs must assume all cross-border transaction data is visible to the NTS. Comprehensive, real-time documentation is essential to defend against AI-identified discrepancies.
- Expansive Interpretation of Permanent Establishment (PE):
- Development: A key focus area is asserting a taxable presence for foreign entities in the digital economy and cross-border services through the PE concept.
- Impact & Practical Issue: Foreign companies with any operational footprint in Korea must reassess their PE risk. This includes dependent agent arrangements and the potential digitalization of services creating a taxable nexus.
- Recharacterization of Payments and Withholding Tax:
- Development: The NTS actively applies the “substance over form” principle to reclassify payments for digital assets and service fees as royalties.
- Impact & Practical Issue: This creates significant withholding tax obligations for Korean payers and potential unanticipated tax liabilities for foreign recipients. The legal nature of transactions must be clearly substantiated by contractual and operational reality.
- Post-COVID Transfer Pricing Scrutiny:
- Development: While Presidential Decree allowed for the use of loss-making comparables during COVID-19, the NTS is now auditing the application of these measures. High-performing sectors during the pandemic (e.g., tech, e-commerce, semiconductors) are specific targets.
- Impact & Practical Issue: Companies that applied COVID-era transfer pricing relief must be prepared to justify their selections comprehensively. The NTS is challenging what it views as the prolonged or incorrect use of these allowances.
Conclusion and Strategic Recommendations
The audit environments in Japan and Korea are characterized by technological sophistication and an assertive approach to cross-border taxation.
Key actions for multinational entities include:
- Proactive Documentation: Implement robust, real-time documentation for transfer pricing, intangibles, and JCT/VAT processes.
- Digital Readiness: Ensure IT systems can support efficient digital audits and secure data exchange.
- Substance Analysis: Conduct a pre-emptive review of operations in Korea to assess PE risk and the characterisation of cross-border payments.
- Engage Local Expertise: Collaborate with local tax and legal advisors to navigate unique procedural rules, including the lack of privilege in Japan and the legal distinction between audit types in Korea.
Failure to adapt to these evolving enforcement trends will likely result in increased audit frequency, substantial tax adjustments, and potential penalties.