The Finance Sector Union has confirmed that 560 jobs are set to go at Westpac Bank, with 150 of those going offshore.
The departments affected by the job cuts are technical services, administration, legal, retail and business banking and administration.
Westpac is consulting with staff about their employment.
The staff briefings follow Westpac's decision to review 28 IT management roles in its wholly owned BT Financial Group and Westpac Institutional Bank last month as part of a group-wide restructure announced last November.