The bulletin intends to provide insights to Consultants in the preparation of their cost estimates to better inform their project estimates in which the NTA is the approving authority.
The bulletin is updated annually, or earlier if the macroeconomic conditions continue unstable.
The latest version of the bulletin was published in June 2026 , replacing the May 2025 bulletin and supplementary notes. It should be used to provide guidance to Sponsoring Agencies on the treatment of future inflation from June 2026 onwards.
For more information on it, please contact capitalprogrammeoffice@nationaltransport.ie
Advice Note The inflation report in its entirety (Modelling & Analysis) was completed prior to the onset of the Middle East conflict which commenced on 28th February 2026. The report in its entirety has been prepared by Grant Thornton and AECOM. All modelling, assumptions, and estimations contained herein have been developed by Grant Thornton and represent estimates rather than certainties; as such, they are subject to change. Considering current global developments, market conditions are inherently volatile. Accordingly, all inflation projections and forecasts presented in the report should be interpreted with an appropriate degree of caution.
Main document:
Support documents:
- 2026 NTA Inflation Full Report
- Cover Note to the NTA Inflation Bulletin June 2026
- NTA Inflation Bulletin – User Guide
- Information Note – Application for NTA and TII – June 26
