Input methodologies are the rules, requirements and processes that underpin regulation under Part 4 of the Commerce Act.
Input methodologies (IMs) underpin the information disclosure requirements that Auckland, Christchurch and Wellington International Airports are subject to.
The IMs cover matters like how assets are to be valued, depreciated and revalued, how we estimate the cost of capital, how tax should be treated, and how common costs should be allocated where businesses provide both regulated and unregulated services.
The IMs for airports were originally determined in 2010 and there have been amendments made to the IMs since then.
We are required to review the IMs at least every 7 years. We substantially completed our first review of the IMs in 2016. We completed the second review on 13 December 2023. You can find more information about both reviews below.
The reasons for the IMs for airports are captured in the reasons papers for the original IM determination and all subsequent amendment determinations – certain determinations and reasons papers can be found via the links below.
Current input methodologies for airports
The consolidated determination below includes the input methodologies that apply for information disclosure regulation. The consolidated determination below does not include the amendments to the input methodologies in “Airport Services Input Methodologies (IM Review 2023) Amendment Determination 2023 [2023] NZCC 34” (Amendment Determination 2023) that apply for information disclosure regulation from the commencement of disclosure year 2026.
Interested persons should use the Amendment Determination 2023 below to identify the input methodologies that apply for information disclosure regulation from the commencement of disclosure year 2026.
On 13 December 2023, we published our final decisions, completing our review of the rules and processes that underpin the Commission’s regulation of airport services, electricity lines services, and gas pipeline services.
