Here's a breakdown of the process.
The count process: what’s happening today?
Fianna Fáil, Fine Gael, and Green party members have returned their ballot papers which will be counted today.
In the region of 14,500 Fianna Fail members were eligible to vote.
Ballot papers which have been submitted will be counted at a Dublin city centre location on Friday.
The sorting of votes will commence at 9am, with counting expected to begin around lunchtime. It is expected it will conclude in the late afternoon.
A live feed from the count centre will be broadcast on Fianna Fail’s Facebook page.
A total of 50 per cent of votes, plus one will be needed for the deal to be accepted.
The Green Party count will begin on Friday morning at the offices of Mazars in Dublin and will be conducted by Mazars staff.
The count will be live-streamed to a small group of people who have been nominated by members of the parliamentary party to observe the process, both yes- and no-voting members.
It is not expected that there will be a running tally of results, and the counting of votes is not expected to be completed before evening time.
The results will be announced publicly by the party.
The Green Party will require a two-thirds majority from its members.
Fine Gael will count votes received from its electoral colleges system today.
The parliamentary party accounts for the vast majority of this vote while the national executive, councillors, and party members account for smaller percentages of the vote.
It is expected that the count will begin around lunchtime tomorrow with a result expected by tomorrow afternoon.