NHAI restores 1.641 WPI linking factor for toll revisions
Roadstar Infra Investment Trust announced that NHAI has restored the WPI linking factor to 1.641 for toll fee revisions via Circular No. 18.127/2026 dated July 08, 2026. This supersedes the previous circular that had lowered the factor to 1.561. The directive follows a MoRTH Office Memorandum dated June 29, 2026, ensuring uniformity in implementation for existing and future highway projects.

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Roadstar Infra Investment Trust announced that the National Highways Authority of India (NHAI) has restored the Wholesale Price Index (WPI) linking factor to 1.641 for the computation of toll fees. This regulatory update supersedes the prior directive issued on September 13, 2025, which had revised the factor to 1.561, thereby impacting the calculation of annual user fee hikes. The restoration ensures that the methodology for connecting the WPI series of 2004-05 to the 2011-12 series remains consistent with the original framework adopted in 2018.
The Trust, in its filing to the exchanges, referenced NHAI Policy Circular No. 18.127/2026 dated July 08, 2026. This circular was issued in pursuance of Office Memorandum No. H-24032/05/2025-Toll (E-253390) dated June 29, 2026, from the Ministry of Road Transport & Highways (MoRTH). The MoRTH directive specifically mandates the adoption of the 1.641 linking factor for all existing contracts and concession agreements, including those of the Trust's Special Purpose Vehicles (SPVs).
The decision follows observations from the Comptroller and Auditor General (C&AG) and directions from the Hon'ble High Court of Delhi regarding the use of the linking factor. The MoRTH memorandum highlights that the move aims to maintain uniformity and consistency in implementation across National Highway projects. The 1.641 factor was originally adopted by NHAI via Policy Circular No. 18.30 dated March 20, 2018.
The latest circular explicitly supersedes the NHAI notification dated September 13, 2025 (Policy Circular No. 18.109/2025). The earlier circular had altered the base year conversion rate from 1.641 to 1.561, affecting the toll fee revision mechanism. The restoration of the original factor applies to all future National Highway projects until further orders or amendments to the National Highways Fee Rules are issued.
| Parameter | Details |
|---|---|
| NHAI Circular No. | 18.127/2026 |
| Circular Date | July 08, 2026 |
| MoRTH Office Memorandum No. | H-24032/05/2025-Toll (E-253390) |
| MoRTH OM Date | June 29, 2026 |
| WPI Linking Factor | 1.641 |
The filing was signed by Jyotsna Shyamkant Matondkar, Company Secretary & Compliance Officer of Roadstar Investment Managers Limited, acting as the Investment Manager to the Trust.
Historical Stock Returns for Roadstar Infra Investment Trust
| 1 Day | 5 Days | 1 Month | 6 Months | 1 Year | 5 Years |
|---|---|---|---|---|---|
| 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
How will the restoration of the 1.641 WPI linking factor impact Roadstar Infra Investment Trust's projected revenue and toll collection for the upcoming fiscal year?
Will this regulatory decision set a precedent for other infrastructure InvITs facing similar disputes over toll fee calculation methodologies?
What are the potential long-term effects on traffic volume and user sentiment if annual toll fee hikes increase due to the higher linking factor?

































