Japan's MOF Updates Inflation-Linked Bond Calculation for 2025 CPI RebasingA · FULL TRANSLATION
# inflation-linked bonds# MOF# CPI# inflation hedge# JGB
Key Points
- The MOF adjusted the indexation-coefficient method for inflation-linked JGBs to match the 2025 CPI rebasing
- Inflation-linked bonds adjust principal with CPI, an inflation hedge
- For investors: a CPI rebasing changes the bonds' calculation basis; holders should take note
Analysis
Japan's Ministry of Finance announced an adjustment to the indexation-coefficient calculation method for inflation-linked JGBs, to match the 2025 rebasing of the Consumer Price Index. Inflation-linked bonds adjust their principal with CPI, serving as an inflation hedge that protects real purchasing power as prices rise. When the CPI's statistical base is updated, the basis for the indexation coefficient must follow. For investors holding or considering Japanese inflation-linked bonds, this is a technical but real change to calculation and returns worth tracking in the official notice.