THIS MONTH IN TAX (Selected highlights)
- Notification of special withholding amounts for individual resident tax
- Final corporate income tax and consumption tax returns for March fiscal year-ends (deadline:June 1)
- Interim corporate income tax and consumption tax returns for September fiscal year-ends (deadline: June 1)
Wage-Increase Tax Incentive Update
The wage-increase tax credit, which reduces corporate tax liability when employers raise wages, is being revised for fiscal years beginning on or after April 1, 2026. Provisions applicable to largecorporations will be abolished, and the supplemental measures tied to employee training costsunder the small- and medium-enterprise provisions will likewise be eliminated.
May has arrived with its characteristic fragrance — the gentle winds that carry the scent of fresh, young leaves through the air. In classical haiku tradition, this image belongs to the season of summer, and so summer, by the poet’s reckoning, is already upon us. Warm days are no longer a surprise; they are simply the season.
This month, we turn our attention to a notable development in Japanese corporate tax administration.
New Documentation Rules for Intragroup Transactions
It is common for companies within the same corporate group — parent and subsidiary, or affiliated siblings — to share systems, expertise, and administrative functions. In practice, this often means a parent company bears the costs of accounting, general affairs, advertising, and website operations on behalf of its affiliates, or leases office space within its own buildings to related entities. These arrangements typically involve the subsidiary making periodic payments to the parent company.
Under rules now taking effect, companies engaged in such arrangements are required to retain documentation setting out “the matters necessary to determine the consideration paid.” In concrete terms, this means not only contracts and invoices, but potentially the underlying calculations themselves — the methodology by which the price was arrived at.
The regulation addresses a longstanding concern: because the parties are related, prices have sometimes been set informally, with amounts determined more by convenience than by any principled basis. Where profits are shifted from one group entity to another without objective justification, tax authorities have reason for concern. This new requirement is designed to ensure that the arithmetic is transparent and defensible.
Two Practical Dimensions
The new rules operate along two distinct lines.
Substantive justification. The consideration charged must be grounded in an identifiable methodology — typically, allocating underlying costs plus a reasonable margin, apportioned by an appropriate metric such as revenue share. Crucially, when the consideration is revised, the revision itself requires justification. Raising an amount simply because the paying entity is profitable — or reducing it in lean years — is unlikely to be regarded as an adequate basis. The rationale must stand on its own.
Documentary compliance. Contracts, invoices, and supporting calculations must be prepared and retained. As with ordinary receipts and invoices, failure to maintain these records may constitute grounds for the revocation of blue-return status — a significant consequence that would eliminate access to a range of favorable tax provisions.
Questions That Remain Open
Whether transactions with individual officers and directors fall within the scope of these rules is among the questions that have not yet been definitively answered. Implementing regulations, ministerial ordinances, and official guidance are expected to be published in due course, and we will monitor these developments closely as they emerge.
The new rules apply to transactions entered into on or after April 1 of this year, meaning they are already in force. We recommend that each company take stock, at the earliest opportunity, of whether such intragroup arrangements exist within its operations, how the amounts involved are currently determined, and whether the relevant agreements are properly documented and retained.
As the early summer breezes arrive, we hope these matters can be approached with the same clarity and freshness that the season inspires.
