The Revenue Commissioners have sent tax demands to some of the 715 Aer Lingus staff who availed of a lucrative "leave-and-return" redundancy scheme in 2008, under which they were rehired on lesser terms.
Last night, a spokesman for the airline declined to comment, saying Aer Lingus was still awaiting a decision from the Department of Enterprise, Trade and Innovation about whether it classed the layoffs as genuine redundancies.
However, the Revenue Commissioners have sent tax demands to some of the 715 staff who availed of the scheme.
The scheme was made available to ground staff at the airline, who received payments of between €30,000 and €140,000.
Employees who received the favourable tax treatment represented an estimated loss of between €25m and €40m to state coffers.