"All costs are in the baselines of the previous agencies."
He said the merge would save the Government $5 million.
The savings targets of the former individual government departments are to be landed with the new super ministry that's taken them over.
The Department of Labour's $223 million savings target now falls on the newly created ministry - nicknamed Mobie.
Minister of Economic Development Steven Joyce told Newstalk ZB the same applied to the other departments that have been merged into the new ministry.
"What will happen is that the savings that were committed to under the four-year budget plans of the previous ministries will continue to need to be obtained."
Public Services Association national secretary Richard Wagstaff said it would be business as usual for about 3000 people employed across the four agencies but staff at the upper levels of those agencies were going through a change proposal.
"Change comes at a cost, it means people aren't as focused - they are worried about their jobs. They are worried about things around them."
He said it was an odd group of agencies to bring together.