Japan has strengthened its tax reporting regime for foreign entities. Revised rules under Japan's tax legislation took effect from the fiscal year beginning April 1, 2025. Foreign businesses that generate income in Japan – or that hold Japanese assets – now face expanded disclosure and filing obligations. Missing the compliance deadline carries significant financial penalties under Japanese tax legislation.
Japan's updated tax reporting rules require foreign entities with a permanent establishment (a fixed place of business under Japanese tax law) or Japan-sourced income to file enhanced disclosures with the Kokuzei-cho (National Tax Agency of Japan). The primary compliance deadline for the first affected fiscal year falls in March 2026 for entities with a December year-end, or within two months of each entity's fiscal year-end otherwise. Failure to comply can trigger penalties, back-assessments, and denial of tax treaty benefits.
This alert sets out exactly what changed, which business categories are affected, and the immediate steps international companies must take now.
What changed and when it applies
Japan's revised tax legislation introduces three key changes for foreign entities operating in or through Japan.
First, the enhanced country-by-country reporting rules now apply to a broader set of multinational groups. The threshold for mandatory group reporting has been revised downward, bringing mid-sized international groups within scope for the first time. Groups that previously fell below the threshold should reassess their position immediately.
Second, the rules governing corporate income tax assessments for foreign entities with a permanent establishment in Japan have been tightened. Attribution rules now require a more granular allocation of profits between the Japanese permanent establishment and the foreign head office. A common mistake among international businesses is underestimating the scope of their Japanese permanent establishment – particularly where sales agents or dependent representatives operate locally. Japan's tax legislation deems certain agent arrangements to constitute a permanent establishment even without a registered branch.
Third, revised withholding tax procedures apply to cross-border payments of dividends, royalties, and service fees. Payers in Japan must now apply enhanced due diligence before reducing withholding rates under an applicable tax treaty. The practical consequence is that recipients abroad must supply updated residency and beneficial ownership documentation to their Japanese counterparties earlier in the payment cycle. Delays in providing this documentation can result in full withholding tax being applied at the domestic rate rather than the treaty rate – a cost that is difficult to recover retroactively.
The effective date is the fiscal year starting on or after April 1, 2025. Entities with non-standard fiscal years must calculate their first affected period accordingly.
Who is affected and what thresholds apply
The revised rules apply to the following categories of foreign entity:
- Foreign corporations with a registered branch or subsidiary in Japan
- Foreign corporations deemed to have a permanent establishment in Japan under domestic tax legislation or an applicable tax treaty
- Foreign entities receiving Japan-sourced income subject to withholding tax, including royalties, dividends, and certain service payments
- Multinational groups whose consolidated revenue exceeds the revised country-by-country reporting threshold
The question of tax residency is central to determining which obligations apply. An entity incorporated abroad but managed and controlled substantially from Japan may be treated as a Japanese tax resident under domestic rules – even without a formal registration. This is a non-obvious risk that affects holding structures and regional headquarters arrangements in particular.
Foreign entities relying on a tax treaty to limit their Japanese tax exposure must confirm that their treaty position remains valid under the updated rules. Japan has revised its administrative procedures for claiming treaty benefits, and prior arrangements that were informally accepted may now require formal documentation and certification.
For a comprehensive review of your Japanese tax position, contact us at info@ferrazwhitmore.com or visit our Japan tax law practice page.
Immediate actions for international companies
Entities within scope should take the following steps without delay.
Review your permanent establishment exposure. Conduct a factual audit of all commercial activities in Japan – including agent relationships, digital service delivery, and management functions performed locally. Japan's tax legislation applies a broad definition, and passive arrangements can create unexpected filing obligations.
Update withholding tax documentation. If your entity receives Japan-sourced payments under a tax treaty rate, contact your Japanese counterparties now. Supply current tax residency certificates and beneficial ownership confirmations. Allow sufficient time for your counterparty to complete their enhanced due diligence before the next payment cycle.
Assess country-by-country reporting obligations. If your group's consolidated revenue is near or above the revised threshold, obtain a formal assessment. Groups that were outside scope in the prior year may now be caught. The filing must be submitted to the National Tax Agency within 12 months of the fiscal year-end.
Review intercompany profit allocation. The new corporate income tax attribution rules require a documented analysis of how profits are allocated between the Japanese permanent establishment and the foreign head office. Transfer pricing documentation should be updated to reflect the revised standards before the filing deadline.
Engage local counsel early. The interaction between Japan's domestic tax legislation and its network of tax treaties is technically demanding. An error in treaty classification or permanent establishment analysis made at this stage can generate a multi-year back-assessment. Engaging a lawyer in Japan with cross-border tax experience at this point – rather than at the filing deadline – significantly reduces that risk.
For detailed guidance on corporate law implications of the new reporting rules, see our corporate law services in Japan. For a parallel development in another high-growth market, our alert on tax reporting changes in the UAE offers useful comparative context.
About Ferraz & Whitmore
Ferraz & Whitmore is an international law firm based in Lisbon, advising clients on tax law and corporate compliance across 46 jurisdictions. As a law firm with Japan practice experience, we assist foreign entities in assessing their corporate income tax exposure, permanent establishment risk, withholding tax obligations, and tax treaty eligibility under Japan's evolving tax legislation. Our team combines Portuguese civil law expertise with English common law tradition – giving international clients a cross-border perspective that single-jurisdiction firms cannot provide. The firm's Asia-Pacific practice supports international entrepreneurs, institutional investors, and in-house counsel navigating regulatory and commercial challenges in Japan and across the region. To discuss your Japanese tax reporting position, contact us at info@ferrazwhitmore.com.
Disclaimer: This publication is provided for informational purposes only and does not constitute legal advice. The information herein should not be relied upon as a substitute for professional legal counsel tailored to your specific circumstances. Ferraz & Whitmore assumes no liability for actions taken or not taken based on the contents of this material. For advice regarding your particular situation, please contact info@ferrazwhitmore.com.