Written with assistance from Daigo Sato
Executive Summary
The 2026 Japan Tax Reform introduces targeted measures to enhance tax equity and reduce opportunities for tax base erosion. Two key developments are: (i) the enhancement of an Alternative Minimum Tax (AMT) framework applicable to high levels of financial income, including capital gains and dividends, and (ii) changes to the inheritance and gift tax valuation of real estate, particularly where valuations based on Rosenka (official land valuation) materially diverge from fair market value (FMV).
1. Alternative Minimum Tax on Capital Gains/Dividends
Overview: Japan’s current regime applies a flat tax rate of 20.315% to listed securities. The 2023 reform introduced an AMT-type regime to ensure that high-income individuals pay a minimum effective tax rate when significant financial income is involved. This regime is effective from 2026. Under the 2026 reform, the threshold for high-income individuals was reduced.
Key Features:
- Applies to high-income individuals exceeding certain income thresholds (e.g., currently approximately JPY 330 million, and JPY 165 million from 2027).
- Requires comparison between existing separate taxation and a minimum tax calculation incorporating financial income.
- Final tax liability is the higher of the two calculations.
Implications:
- Narrows the disparity between the taxation of financial income and progressive employment income.
- Increased focus on monitoring effective tax rates.
- Portfolio structuring and income timing strategies may require reassessment.
2. Inheritance Tax Reform – Real Estate Valuation (Rosenka)
Overview: Real estate has traditionally been valued using Rosenka, which is set at approximately 80% of FMV. Rosenka is subject to certain adjustments to reflect various circumstances related to the property, in accordance with the detailed guidelines set out in the Asset Valuation Basic Tax Circular. Typically, rental property is subject to an adjustment to reflect the value of the tenant’s rental rights. As this adjustment can significantly reduce the property value for the landlord, it has historically been used in tax planning to reduce the inheritance tax value of real estate. In some aggressive cases, however, the tax authorities have discretionarily used FMV instead of the Rosenka-based valuation. The reform amends the guidelines for rental property to adjust valuations where significant discrepancies exist between FMV and the Rosenka-based value.
Key Changes:
- Where rental property was acquired by the deceased person within five years before the time of inheritance, under certain conditions, it will be valued at 80% of the acquisition cost, as adjusted to reflect changes in land prices.
- Greater reliance on market comparables and appraisal methodologies.
- Targets leveraged structures and recent acquisitions with depressed valuations.
Implications:
- Increased audit scrutiny and risk of valuation adjustments.
- Increased importance of independent appraisals and documentation.
- Traditional estate planning strategies using valuation discounts may be less effective.
Conclusion
These reforms signal a continued shift toward fairness and substance-based taxation. Taxpayers should reassess existing structures, strengthen valuation support, and proactively evaluate potential exposure under the revised rules.
DISCLOSURES
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This document provides a general overview of the Japan 2026 Tax Reform and does not constitute tax or legal advice. Specific advice should be obtained based on individual circumstances.
