Under the proposed deal, public service pensions will be cut, with former Taoisigh Brian Cowen and Bertie Ahern facing reductions of €7,500 a year.
There's also a clause in the agreement allowing for renegotiation at any stage, despite Minister Brendan Howlin saying that this will be the last ask of public servants.
The Association of Higher Civil and Public Servants became the first union to formally recommend a NO vote to its members.
And the Civil Public and Services Union's General Secretary Eoin Ronayne said they are likely to follow suit and will officially decide tomorrow.
Even though they had more influence on the deal while they were involved in the talks, he said they have no regrets about leaving early:
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