Is Japan's public balance sheet exposed to yen appreciation and rising rates?
Core argument: Japan's consolidated public sector has issued total liabilities worth 255% of GDP, and large-scale asset purchases have sharply shortened the duration of those liabilities.
The consolidated Japanese public sector has issued total liabilities worth 255% of GDP. The large-scale asset purchases have dramatically shortened the duration of those liabilities. Bank reserves held at the BoJ — floating-rate liabilities — are worth 75.5% of GDP in 2025Q3, down from 90.7% in early 2024. On the asset side, the public sector has a long position of 56% of GDP in foreign securities, largely unhedged. The massive depreciation of the JPY has provided a nice fiscal tail wind. As the BoJ raises short rates and lets the long end of the yield curve snap back, the appreciation of the JPY would cause large losses on the asset side. In addition, the public sector has another 50% of GDP invested in equities, long-duration assets that will be marked down as real rates climb.



