Mr Green said Thursday's budget struck fear and paranoia into the public service, and the savings identified were ''optimistic in the extreme''.

The public service will be forced to shed 700 positions, with 500 over the next two years, and 200 more over the next four.

''The impact on jobs and services is the deception at the heart of this budget,'' Mr Green said.

''These are not people who the Liberals accuse of sitting on their bums in an office in Hobart, they are real people who deliver real services in regional communities right around Tasmania,'' Mr Green said.

When parliament returns next week, Mr Green will deliver an alternative speech, but won't present an alternative budget.

''We'll be presenting a document that highlights issues that Tasmania faces as a result of this budget,'' he said.

''The government claims it is spending record amounts on health and education but at the same time is slashing budgets and clawing back tens of millions of dollars from government departments,'' he said.

Mr Green said he would be asking questions during estimates hearings on what the cuts would mean for agencies.

He said the real net number of public sector workers to go would be more than 1100, a figure unions agree with.

Community and Public Sector Union secretary Tom Lynch said the government was pushing the hard work onto agencies.

Mr Lynch said many government departments had already contacted staff to inform them savings had to be made.

He said the Justice Department had a meeting on Thursday to discuss job cuts, and the Department of Premier and Cabinet would hold meetings on Monday.

Mr Lynch said the State Fire Service, Education Department were also advising staff that savings measure processes were underway.