Introduction
Japan’s 令和8年度税制改正の大綱 (FY2026 Tax Reform Outline) introduces significant changes to the 外国子会社合算税制 (CFC rules). These reforms affect how Japanese parent companies are taxed on foreign subsidiaries, especially those in low-tax or paper-company jurisdictions.(mof.go.jp)
Key Changes to the CFC Regime
| Area | Old Rule | New Rule / Revision |
|---|---|---|
| Tax burden threshold | A foreign subsidiary’s effective tax burden needed to be 30% or more to qualify for exemption | Threshold lowered to 27%—more subsidiaries may now be caught under CFC rules.(mof.go.jp) |
| Paper-company (資産割合) requirement | Required checks even if revenue was zero | If total assets (貸借対照表上の総資産) are zero, then asset ratio requirement is waived, reducing paperwork.(mof.go.jp) |
| Timing of consolidation | CFC inclusion related to business year ended, with deadlines around February | Change allows more time: certain deadlines moved to April after foreign subsidiary’s fiscal year end.(mof.go.jp) |
| Documentation burdens | Extensive document attachment requirements for all foreign subsidiaries | For some 部分対象外国関係会社 (part-subject companies) with no consolidated amount, obligations relaxed: attaching documents becomes saving documents; certain documents removed.(mof.go.jp) |
Practical Impacts
- More entities may be in scope now that lower tax thresholds apply. If your foreign subsidiary has borne an effective tax rate below ~27%, Japanese parent may need to include its income under CFC rules. - Less burden where no real activity: asset zero firms will avoid some tests and paperwork. - Administrative deadlines shift, allowing more time to prepare. - Risk of penalties if unaware—compliance must be proactive in corporate reporting.
Examples
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Example 1: A Japanese company owns a foreign holding with minimal assets and no revenue (asset value zero). Under revised rules, it doesn’t need to satisfy paper-company asset ratio if effective tax burden is low, and documentation is lighter if no profits (合算金額) to report.
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Example 2: A business with a foreign subsidiary in a jurisdiction that has recently increased corporate tax. Previously exempt; now with the effective tax burden still below 27%, the Japanese parent needs to consolidate its profits for Japanese taxation.
Actionable Steps
- Map all foreign subsidiaries: identify those in paper-company or low-tax jurisdictions.
- Calculate actual effective tax rate: include all relevant foreign and domestic taxes to see whether they cross the 27% threshold.
- Determine asset and revenue metrics: check if the subsidiary has total assets zero or negligible revenue—this could reduce burden.
- Review document requirements: identify which forms/document types can be dropped for entities with no consolidation.
- Update internal systems to align with new deadlines—especially fiscal year-ends and parent company reporting.
Conclusion
Japan’s CFC reforms under the FY2026 tax reform aim to balance anti-avoidance with reducing burdens on companies with little real activity abroad. While thresholds lowered and paperwork eased in certain cases, the risk for non-compliance has increased. Multinational groups should assess exposure now to avoid surprises when new fiscal years begin.