Six hundred Bank of Scotland (Ireland) workers are to strike over the closure of the finance house, union chiefs have revealed.
Some 94% of front desk and back office staff voted to take action over management plans to lay off hundreds and wind down the business.
The Unite trade union claimed affected employees were still in the dark over a new firm being set up to oversee the close of business by the end of the year.
Brian Gallagher, Unite official, warned the industrial action will cause significant disruption to management and have consequences for the bank's global reputation.
"The Bank of Scotland (Ireland) management have continually sought to sugar its closure announcements with promises and undertakings," he said.
"At no point, though, have they come forward with proposals to the workers on critical issues including terms of secondment to the new company that will manage the winding down of the bank's interests in an orderly fashion as is required by law; redundancy issues, a pension scheme deficit that must be addressed and the question of equal treatment for all staff."
"We continue to make ourselves available for meaningful negotiation at a single moment's notice."
Unite said it plans to hold the industrial action on Wednesday October 20.
Members at the bank cast their votes at offices in Dublin, Cork, Limerick, Galway, Waterford and Sligo today and management will be notified of details of the strike on Wednesday.
Bank of Scotland (Ireland) announced in August it was shutting its doors with employees transferred to an independent firm to close accounts and manage the existing 30 billion euro loans.