National's promising to stick to three spending guardrails if it returns to Government, and is calling on other parties to follow suit.
The party's promising a return to surplus in 2028/29 - and bending debt below 40 percent of GDP.
It's also promising to reduce the size of Government, bringing spending to 30 percent of GDP.
Finance Minister Nicola Willis joined the Weekend Collective to explain further.
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Qiulae Wong: Opportunity leader on the party's plan to regulate political donations
16:42

David Seymour: ACT Party leader on the party's plan to 'good employer' requirements from public service legislation
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Barbara Edmonds: Labour's finance spokesperson responds to National's budget responsibility rules
09:13