ANZ Bank union members will be walking off the job tomorrow, after a vote earlier this week to take strike action.
The First Union said members from several of the bank's branches were striking tomorrow "speaking out against bank proposals that would be highly disruptive to family life."
Workers' key concern was a proposal from ANZ for more 'flexibility' that would leave some staff not having predictable days, start and finish times they could rely on, said Maxine Gay, Retail and Finance Secretary, FIRST Union.
An ANZ spokesman said the bank was "disappointed that union members have voted for industrial action when a very good offer is on the table. The same offer has been made available to non-union staff and has met with a very positive response."
He said the bank expected all branches would remain open and that all banking services will be available to customers tomorrow.