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Mizuho Securities

May 28, 2026

Scenario Analysis for Domestic Fiscal Impact of Higher Defense Spending

Macro ThematicRates Govt BondsMacro Economic IndicatorsOther

Japan's push for higher defense spending faces significant fiscal hurdles as inflation and GDP rebasing increase the absolute cost of the 2% GDP target. Reaching 3.5% of GDP would require up to JPY 17tn in additional annual funding, potentially pressuring the JGB market.

Key Takeaways

  • 1.Maintaining defense spending at 2% of GDP requires significantly higher absolute expenditure than previously estimated (approx JPY 13.8tn by FY2026) due to inflation and GDP rebasing.
  • 2.A transition to a 3.5% of GDP defense spending target could increase the annual fiscal burden by up to JPY 17.3 trillion by FY2031 compared to current levels.
  • 3.The government is likely avoiding specific spending targets currently to prevent rekindling market concerns regarding Japan's fiscal sustainability.

Table of Contents

  • Scenario analysis for the domestic fiscal impact of higher defense spending
  • Debate over magnitude of increase in defense spending and potential implications for the bond market
  • Important Disclosure Information
  • Analyst Certification
  • Disclaimer

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