2027 Fibre Input Methodologies Review

The Commission has begun its first review of the fibre IMs. Our initial view is that the fibre IMs are generally working well, and an in-depth bottom-up review is not required. While considering the breadth of the IMs, our work in the review focuses on the areas of highest value to end-users of fibre services.

On 27 March 2025, two Notices of Intention and an Open letter seeking stakeholder views on the process and initial focus areas of the Fibre IM review were published. This included signalling that the where the fibre cost of capital IMs were common regulated suppliers under Part 4 of the Commerce Act we would be considering these IMs, these common areas include our approach to the cost of debt, the risk-free rate of interest for equity, and the tax-adjusted market risk premium. Submissions on the Open letter closed on 29 April 2025.

The Fibre IM Review 2027: Issues paper (Tranche 1) and the Fibre input methodologies draft decision-making framework paper were published on 10 July 2025. Stakeholders provided their views on these papers through submissions and cross-submissions.

The final Fibre input methodologies Decision-making Framework paper was published on 10 March 2026. This is an enduring document that will be used in future fibre IM reviews.

Consultation on our draft decision

We are now seeking stakeholder views on our draft decision. The draft decision is delivered as two packages:

• The Common cost of capital input methodologies review (fibre and regulated suppliers under Part 4) draft decision package published on 10 March 2026.
• The Fibre IM Review 2027 (Tranche 1) draft decision package published on 17 March 2026.

The submission period for both closes on Tuesday 16 April 2026, with a cross-submission period from 22 April to 6 May 2026.

There will be further opportunities for stakeholders to present their views as we progress through this project.