June 27, 2025 Establishment and Notification of Standard Charge Indices for Specified Telecommunications Services Provided by Nippon Telegraph and Telephone East Corporation (NTT East) and Nippon Telegraph and Telephone West Corporation (NTT West)

　The Ministry of Internal Affairs and Communications (MIC), following Article 21, Paragraph 1 of the Telecommunications Business Act (Act No. 86 of 1984), has established the standard charge index applicable to specified telecommunications services (subscribed telephone, ISDN and public telephone) provided by NTT East (Headed by SHIBUTANI Naoki, President) and NTT West (Headed by KITAMURA Ryota, President). These standard charge indices are applicable for one year, from Wednesday, October 1, 2025, through Wednesday, September 30, 2026, and MIC has notified NTT East and NTT West of the indices today.

1. Notified standard charge index

Note: The initial value of the standard charge index is 100 (charge index as of April 1, 2000).
　The figures in parentheses are the current standard charge indices (from October 1, 2024, through September 30, 2025).
*1 Subscribed telephone and ISDN (basic charge, subscriber telephone subscription fee and calling fee), public telephone (calling fee), and number guide fee

[Formula for calculating the standard charge index]
Standard charge index = Standard charge index during the previous applicable period
× (1 + Rate of change in consumer price index - Estimated rate of increase in productivity (X-value) + Exogenous factors)

*2 The current X-value (applicable from October 1, 2024, through September 30, 2027) is calculated based on the March 2024 report of the Study Group on the Operation of the Price Cap System.