Efforts to reduce carbon emissions quickly enough to meet government targets will be "tight", and still well below what's needed to avoid a large offshore carbon credits bill in the future.
The Act party would cut climate and social spending, but increase defence spending to match Australia's as a proportion of the economy.
The strong labour market continues to prop up the government's books.
Reserve Bank of New Zealand governor Adrian Orr said RBNZ has been "very courageous" in raising interest rates before other central banks.