The Association of Higher Civil and Public Servants will be recommending a 'No' vote in a ballot of its members on the proposed extension of the Croke Park Agreement.
Trade unions and the Government are today considering the finalised copy of the draft deal from the LRC.
The agreement will see pay cuts of 10% for those earning more than €185,000 and 5.5% for those earning more than €65,000 a year, as well as longer working hours and lower overtime payments.
This decision was taken today by the Executive Committee of the AHCPS who said: "The current proposed cuts are simply a step too far."
General Secretary of the AHCPS Dave Thomas said: "Today’s decision is one that was not taken lightly, however given the scale of the pay cuts proposed we have no other choice but to strongly recommend a no vote on the part of our members.
"AHCPS members have already suffered pay reductions of between 15% and 17% before tax and USC increases are taken into account, in addition to extra working hours.
"In addition these proposals raise legitimate questions as to the actual value that the Government currently places on the work carried out by civil and public servants.
The AHCPS, which represents mainly high-ranking civil servants and the non-commercial semi-state sector, urged the Government to look at tax reform.
The union has more than 2,700 members.