Government plans to merge some of its departments are being described by critics as arbitrary cost-cutting measures.
Prime Minister John Key says the aim is to make them more efficient and responsive but Labour thinks the opposite will happen.
"Constantly reorganising the public service doesn't make it more efficient," state sector spokesman Chris Hipkins said on Tuesday.
"Constantly spending money on restructuring doesn't improve the quality of services."
Public Service Association national secretary Brenda Pilot says there's no overall plan.
"All we've had so far is cuts, cuts and more cuts," she said on Radio New Zealand.
"That's not a substitute for a good plan for the public service, it's just cutting for the sake of it."
Mr Key will outline the government's intentions in a speech in about three weeks, until then he isn't confirming there will be job cuts.
Finance Minister Bill English told NZ Newswire early this year there would be more public sector job losses in the next 12 months.
Mr Key says money is going to be tight for all departments and his May budget will have a new spending cap of $800 million.
Most of that will go to health and education, but they'll only just be able to cope with population increases.
"It's going to be tight for those two big-spending ministries, let alone anyone else," he said on Monday.
NZN