Prime Minister Christopher Luxon has shared his Christmas list heading into the first 100 days of the newly elected Parliament, as well as commented on some of the high-profile public service jobs that could be in the firing line.

Luxon spoke with the Mike Hosking Breakfast today after the official swearing-in of his coalition government with Act and New Zealand First and provided insight on the "pen-stroke" initiatives to get done before December ends.

"We want to get on and repeal RMA reform, we'll want to start the process of getting Three Waters repealed," he said.

"We want to get rid of fair-pay awards, so that's the big goal for this week - to get our government's one-hundred-day plan sorted."

Luxon's immediate attention after the swearing-in will be to establish the plan and "get everybody signed up to it".

The plan will contain up to 50 actions designed to kickstart the three-way government's momentum to accomplish the policies it agreed during coalition talks.

Hosking asked about the December mini-budget, which will give a first look at the new leadership's analysis of the country's financial predicament – noting the heavy emphasis on the word "mini" from those in National's camp.

Luxon said the Treasury’s Half-Year Economic and Fiscal Update (Hyefu), which is a set of forecasts the finance minister has to ask the Treasury to produce by the end of December under the Public Finance Act, will typically come in the week before Christmas.

At this point, the Government will review the figures with briefings - the Prime Minister suspects there will be “fiscal cliffs” and holes that will emerge as the numbers are revealed.

"We're not particularly hopeful the books are in good a shape as [former finance minister, Grant] Robertson said they would be," said Luxon.

"We need to look at that and make any adjustments we can and measure any decisions before Christmas as quickly as we can. There will [also] be a series of actionable decisions we will take to try and course-correct some of it and obviously correct the rest of it in the big budget in May."

Hosking asked about the job security of two public servants in particular - Adrian Orr, Governor of the Reserve Bank and Police Commissioner, Andrew Coster.

Luxon admitted neither he nor Finance Minister Nicola Willis had spoken with Orr yet because they were not yet sworn ministers.

He noted Orr had been signed up for four years, but the Government would do a performance review of the Reserve Bank to determine its actions - particularly over the Covid-19 pandemic period - to see if it made things worse.

Luxon said he would be willing to work with Orr.

Hosking remarked many believed Orr had performed poorly, a view Luxon said wasn't necessarily his own.

"We need to make sure we have a good understanding of exactly what has happened in that context," he said.

"We need to work with the Reserve Bank, we'll do that very well and professionally, but we want to understand the bank on a few of those issues and get focused on one mandate - controlling inflation."

Coster’s job has been speculated to have hung in the balance since National was elected last month and Luxon said the decision on his job would be made by Police Minister Mark Mitchell.

Luxon said there has been no discussion yet about Coster's role.