New South Wales Treasurer Mike Baird says public sector workers who are offered voluntary redundancies will be sacked if they do not accept them.

The State Government has today released details of the first 1,900 public sector jobs which will go as part of a plan to shed 5,000 positions.

The job cuts were announced by Mr Baird when he handed down his first budget last month, and were described at the time by the Treasurer as "voluntary redundancies".

But this morning Mr Baird was quizzed in an estimates hearing in State Parliament about what will happen if a worker refuses to accept a redundancy package.

"If they decide they don't want to pursue that then there is three months to look for another job," Mr Baird told the committee.

"What we have done is get rid of that unattached list."

Workers that do not find another job within the three months will not be kept on the public payroll.

Mr Baird's stance was criticised by Labor MP Walt Secord.

"Voluntary no longer means voluntary. Voluntary means sacked," Mr Secord said.

The 1,900 redundancies offered today cover 10 departments.

In the Justice Department 498 packages have been offered, while the Education Department is to shed 262 jobs.

The Government says the jobs being cut are not front-line positions, but Opposition Leader John Robertson says the end result will be the same.

"These jobs, whether they're on the front-line or back of house, are going to lead to reduce service levels because people will be taken away from the front-line to fulfil those functions," Mr Robertson said.