The Federal Government is ramping up the pressure on Opposition Leader Bill Shorten, questioning if he will "wibble wobble" like jelly over budget savings when parliament resumes next week.

Finance Minister Mathias Cormann made the attack in a speech to the Sydney Institute.

"Will Bill Shorten step up to the plate on budget repair in this parliament?" Senator Cormann asked the audience.

"Or will he be like jelly on that plate, the wibble wobble, wibble wobble jelly on a plate, first opposing, then supporting, then not knowing what to do?"

The Government plans to wrap together $6.5 billion of budget cuts into one omnibus bill, which it says will include measures Labor has indicated it will not oppose.

"We should not even have to have a conversation about those," Senator Cormann said.

"In fact that should only be the absolute minimum starting position."

But the Opposition has consistently said while it will honour its election commitments, it wants to see the legislation before deciding how to vote.

Government cuts will save $221b over the next decade

The Finance Minister said the Coalition had already made 800 policy decisions since 2013 that will save the federal budget a total of $221 billion over the next decade.

But the majority of the savings come from structural changes to the budget, which will have a bigger impact in the second half of that decade.

"$26 billion of that net saving falls into the period of the current forward estimates building up to a further $195 billion in the period from 2020-21 to 2026-27," Senator Cormann said.

"We will engage with Labor and all parties to achieve the successful passage of further budget improvements through the Senate."