The Tokyo Core CPI y/y is a key leading indicator of national inflation trends in Japan, as Tokyo is often considered a bellwether for the country's broader price pressures. By excluding volatile fresh food prices, the core CPI provides a clearer picture of underlying inflation, which is crucial for the Bank of Japan (BOJ) in determining its monetary policy settings.

Scheduled for release on October 1, 2026, at 23:30 GMT, the forecast for this reading is 2.4%, marking a potential acceleration from the previous month’s 1.8%. A rise toward 2.4% would likely be seen as a sign that inflation is becoming more entrenched, potentially increasing pressure on the BOJ to reconsider its long-standing accommodative monetary stance.

The data will have a direct impact on the Japanese Yen (JPY). If the print hits or exceeds the 2.4% forecast, it could boost the Yen against major counterparts like the USD and EUR, as market participants anticipate the BOJ may eventually move toward policy normalization. A reading significantly below expectations, however, might lead to Yen weakness, as it would suggest that inflation remains subdued and that the central bank has little reason to alter its current path.