Reserve Bank of New Zealand Deputy Governor Christian Hawkesby said on Monday that policymakers want rates to be "comfortably above neutral" to help lower core inflation.

Hawkesby told Reuters in a phone interview the RBNZ had "certainly considered 25 or 75" basis point increases last week before ultimately deciding to raise the cash rate by 50 basis points (bps).

He said if the committee thought that market pricing was wrong and they need to shift it they would consider a larger move than 50 bps.

"At the meeting last week, we sort of reflected that actually market pricing for the OCR (official cash rate) over the period ahead was reasonably similar to what we were putting out in our OCR projections," he said.

New Zealand's central bank last week delivered its seventh straight interest rate hike and signaled a more hawkish tightening path over coming months to rein in stubbornly high inflation. The cash rate is now at 3.0%, a level not seen since September 2015, and rates are forecast to be at 4.0% by early next year.

Hawkesby said the central bank's strategy was to get the cash rate "comfortably above neutral" to help to bring down core inflation.

"That will afford us some breathing space to see how things are playing out," he said.

"Once we get the OCR up into that 4%-4.25% level we're seeing things evenly balanced from there. So we'd put equal weight on having to put the OCR up as we would putting it down."

A number of economists are expecting the central bank will be forced to cut rates in 2023 due to slowing growth. In the first quarter, New Zealand's economy unexpectedly contracted due to a surge in COVID-19 cases and growth is expected to be restrained over coming quarters due to tightening financial conditions.

"The economy will evolve differently than our projections. There will be shocks that come along. There'll be data that's different than the forecast. And we'll just keep coming back to what does it mean for our mandates," Hawkesby said.

"We certainly are projecting an environment where the economy cools," he said.