Context & Reform Highlights
With the 令和8年度税制改正 (FY 2026 tax reform), Japan made significant changes aimed at improving fairness in income taxation, especially for very high-earning individuals. These measures are enacted as part of the tax reform package passed in late December 2025, and are effective for taxable years beginning on or after January 1, 2026 (令和8年分所得税等) unless otherwise specified. (mof.go.jp)
Key changes include:
- The special deduction threshold (for calculating additional tax burdens on very high incomes) has been lowered from ¥330 million to ¥165 million. (mof.go.jp)
- The tax rate for incremental taxable income above that threshold has been increased from 22.5% to 30%. (mof.go.jp)
- Other reforms include increases in basic deductions and wage income deductions to offset cost-of-living pressures, meaning non-high earners get relief even as the top brackets become steeper. (mof.go.jp)
Who Is Impacted
- Individuals with annual taxable income exceeding approximately ¥165 million. Those who once benefitted from generous cuts are now subject to more taxes on income above that level.
- High-income professionals: corporate executives, celebrities, investment fund managers, entrepreneurs with high profit shares.
- Tax planners and advisors crafting compensation and benefits arrangements for individuals nearing the old threshold.
Example: Before vs After
Suppose an individual has taxable income of ¥200 million (excluding deductions):
- Under the old rules, the portion above ¥330 million would not apply; they would stay in previous bracket rates.
- Under new rules: the portion above ¥165 million is now taxed at 30%, substantially increasing marginal tax rate for that slice.
- However, increased basic deductions and wage income deduction minima will slightly cushion this for those not far above the threshold.
Mitigation & Planning Strategies
- Shift income timing or type: defer realization of income to future years, or convert it into dividends, capital gains or investment income if these are taxed more favorably under bilateral treaties.
- Use tax treaties: for foreigners, double-taxation agreements may provide relief. Review recently signed treaties like the upcoming Japan-Philippines convention for investment income and business profit clauses. (mof.go.jp)
- Leverage deductions: maximize contribution to eligible deductions: housing loan interest, certified energy efficient (省エネ) investments, spouse and dependent exemptions. The reform also increased wage income deduction minima.
- Plan compensation structure: consider forms such as bonuses vs salary, deferred compensation, equity or stock options — all of which can affect timing and rate.
Compliance Imperatives
- Employers must update payroll systems, and ensure withholding (源泉徴収) reflects new rate bands.
- Update tax return templates and schedules especially those for high income slabs.
- For foreign nationals working in Japan or non-residents with Japanese source income, carefully check treaty applicability.
Conclusion
If you earn in higher brackets (~¥165 million+), FY 2026 reforms bring meaningfully higher taxes on income exceeding the threshold, despite relief elsewhere. Be proactive: assess income mix, optimize deductions, consider timing, leverage treaty structures — or consult a tax attorney if needed.