In a message to CIPR members sent out today, McCapra said he had opened a consultation with CIPR staff on a restructure of the sectretariat, and the job cuts would be made if his proposals go ahead.
"This will reverse a trend we have seen in recent years for staff members to steadily increase," he said.
He added that plans to improve the way the institute is managed were being brought forward, and the CIPR would "move away from being a central provider of services towards a lighter, more networked organisation".
He said: "The structures we have in place now are top-heavy, slow, and old-fashioned. In a couple of weeks Council will be working on proposals for a new structure which is leaner, more responsive and more businesslike."
He also announced plans to make the organisation less London-centric, including appointing a permanent representative in Scotland and holding this year's AGM in Manchester.
In addition, charges for membership of more than two CIPR groups have been abolished, to encourage members to develop a broad range of knowledge.