Front line Corrections staff will not be among the 140 people to lose their jobs if a proposal goes ahead to bring prisons, rehabilitation and probation services together.
Under the plan the services would be combined into one team that would be responsible for daily management and rehabilitation of all offenders across the country.
While it would see changes in management structure at head office and in some regional offices, front line staff would not be affected, said Department of Corrections chief executive Ray Smith.
The changes were aimed at making communities safer by "lifting our performance'' said Mr Smith, who has developed it over the last six months.
"The proposed new structure will enable us to work together to co-ordinate the management of each offender at every stage and address the underlying causes of their offending.''