Almost 50 First Trust staff in Belfast will miss out on a Christmas bonus after parent company AIB was prevented from paying any incentives.
Call centre staff in Belfast, Swords, Naas, the Isle of Man and Jersey were due to share a 2.4m euros payout.
The money was part of an overall package of 40m euros (£33m) AIB planned to pay its staff in backdated bonuses.
However it was blocked after Irish finance minister Brian Lenihan threatened to withhold state funding.
AIB has already had a 3.5bn euros bail-out from the government.
Mr Lenihan said that financial aid would be conditional on the non-payment of bonuses "no matter when they may have been earned".
The Belfast workers were due to receive the bonus in their December salaries.
A spokesman for the bank workers' union, the IBOA, said it was seeking legal advice about AIB's decision not to pay the bonuses.