The Employment Wage Subsidy Scheme is being cut by up to €147 a week for each staff member today.
Until now, the state paid up to €350 a week towards a worker's wages.
But from today, the maximum rate is €203.
Padraig Cribben, the chief executive of the Vintners Federation of Ireland, is calling on the government to reverse the decision.
"What we have seen over the last two weeks is a very, very significant amount of parties that would take place at this time of the year being cancelled on foot of the public health advice.
"And yes, it is necessary that the supports be maintained at their current level until those restrictions are lifted."
