The Finance Minister's dropped a few crumbs on what's shaping this year's budget.

Nicola Willis will unveil her growth budget on May 22.

She says the public service won't get more funding, for doing the same thing.

Willis says there's only more money if people are going to benefit from additional services - or improved impact from those services.

But she says she won't be doing away with entire departments or agencies.

"That's not on the agenda for this budget, because the judgement that we've made at this stage is that it could end up costing us more in the short-term than we would deliver in savings."

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