The system of voting in all Dáil elections, Seanad elections, Presidential elections, European elections and local elections is proportional representation with a single transferable vote (PR-STV) in multi-seat constituencies (3-, 4- and 5-seat constituencies at Dáil elections).
Proportional representation means that as a voter, you can indicate your first and subsequent choices for the candidates on the ballot paper.
The names of the candidates will appear in alphabetical order on the ballot paper, together with their photographs and their party emblem (if they wish).
Voting by proportional representation
You indicate your first choice by writing 1 opposite your first choice and 2 opposite your second choice, 3 opposite your third choice and so on. You may stop marking your paper after 1 or any subsequent preference or you may go right down the ballot paper until a preference has been given to all candidates ending with the candidate of your lowest choice.
When you vote like this, you are instructing the returning officer to transfer your vote to the second choice candidate if your first choice is either elected with a surplus of votes over the quota or is eliminated. If your second choice is elected or eliminated, your vote may be transferred to your third choice and so on.
Counting the votes
When polling is over, all the ballot boxes are taken to a central counting place for each constituency. The count starts at 9am on the day after polling day. The ballot papers are then sorted into piles of ballot papers for each candidate.
The ballot papers are mixed, counted and sorted and spoiled papers are rejected. A paper is spoiled if it does not have an official stamp, if it does not indicate a clear choice, for example, if you have indicated No. 1 twice on the paper, or if anything is written on the ballot paper by which the voter can be identified. The total valid poll therefore, is the total number of votes minus the number of spoiled papers.
When the papers have been counted and sorted, the quota is calculated by dividing the Total Valid Poll by one more than the number of seats to be filled, ignoring any remainder and then adding 1 vote. For example, in a Dáil election in a 4-seat constituency with 50,000 votes cast, 50,000 divided by 4 plus 1 (that is, 5) = 10,000; 10,000 plus 1 is 10,001. This is the quota of votes to be reached by the candidates and it means that only 4 persons can be elected.
If a candidate receives more than the quota on any count, the surplus ballot papers are transferred to the remaining candidates in proportion to the next available preferences indicated by voters (that is, the next preference on each ballot paper for a candidate who has not been elected or eliminated). For example, if candidate A receives 900 votes more than the quota on the first count and on examining all of candidate A's ballot papers, it is found that 30% of these have next available preferences for candidate B, then candidate B does not get 30% of all candidate A's ballot papers (quota plus surplus), instead candidate B gets 30% of A's surplus, that is, 270 ballot papers (30% of 900).
Where a candidate is elected at the second or at later count, only the ballot papers that brought them over the quota are examined in the surplus distribution, that is, the parcel of ballot papers last transferred to the elected candidate.
If 2 or more candidates exceed the quota at the same time, the larger surplus is distributed first. The surplus must be distributed if it can elect a candidate or save the lowest candidate from elimination or qualify a candidate for recoupment of their election expenses or deposit (if applicable).
Where there is no surplus for distribution or the distribution of the surplus is prohibited, the next step is the elimination of the lowest candidate. Two or more of the lowest candidates must be excluded together where it is clear that they cannot possibly be saved from elimination in the long run. Where a candidate is eliminated, all of their votes are transferred to the next available preferences on them.
Counting continues until all the seats have been filled. The last seat can be filled either by a candidate(s) exceeding the quota or by a candidate(s) being elected without reaching the quota because it is clear that they are ultimately going to be elected. Thus, if the number of seats left to be filled is just one less than the number of candidates still in the running and an available surplus cannot bring the lowest candidate level with or above the second lowest candidate, all the candidates, except the one with the lowest number of votes, are deemed elected even though none of them have actually reached the quota.
Recouping election expenses
Candidates at most elections qualify for recoupment of their election expenses (up to a maximum of €8,700 at a Dáil election), provided the number of votes they receive at the count exceeds one-quarter of the quota. There are extra count rules that are designed to give candidates every chance of reaching this vote threshold. The threshold is calculated differently at a bye-election so that the minimum number of votes required to qualify for recoupment of elections expenses at a general election and at a bye-election in the same constituency is broadly comparable.
Candidates can ask for a recount of a particular count or of the entire count. A recount of a particular count involves examining all papers relevant to that count and moving papers to correct any errors. A complete recount generally occurs only towards the end of the entire count and involves checking all the votes as they stand (without moving any of them) to ensure that each is credited to the correct candidate and that each parcel of papers contains the correct number of papers. Any errors are noted and when the checking is completed, the cumulative effect of all the errors is analysed. The returning officer confirms the results already announced unless a significant error (that is, one likely to result in a different candidate being elected or excluded) is uncovered, in which case the votes are counted afresh at the point from which the error occurred.
When the count is completed, the returning officer declares the results of the election.
The Department of Housing, Planning, Community and Local Government have published a guide to proportional representation (pdf).
Where to apply