When counting the votes after voting finishes, there are several different phases we follow to determine the winner. All of these phases are required by legislation.

To win a seat in the House of Assembly, a candidate must receive an absolute majority of the total formal votes cast in the electoral district they are contesting. 

That means more than 50% of all the valid votes. Although the media may often ‘call’ the winner of an election early based on probability, ECSA will not announce a winner until the outcome of the election is certain.

Election night counts

When voting ends at 6:00 pm on election night, most of the votes cast at polling booths that day are counted. After the last voters have left and the doors of the polling booths are closed, election staff open and empty the House of Assembly ballot boxes.

First preference count

Ballot papers are unfolded and are sorted into separate piles according to the number ‘1’ preference (also known as ‘first preference’) marked on them. After they have all been sorted, the number of ballot papers in each pile is counted. The result of the first preference count is recorded and is then published progressively on the ECSA website and in the media.

Two-candidate preferred count

The first preference count is often insufficient to indicate the most likely winner of an election. This is why we next conduct a two-candidate preferred (or 2CP) count.

This time, election staff distribute all the formal ballot papers into just 2 piles – one pile for each of the two candidates predicted to be the leading candidates in the election. Staff look at the ballot papers for all the other candidates and sort them according to whichever of the 2 predicted leading candidates has been given the higher preference by the voter. The 2 piles are then counted, and the result of the 2CP count is recorded and then published on the ECSA website and in the media.

After these two election night counts are finished, the ballot papers are packaged up in their piles, and securely transported to the returning officer for the electoral district.

Re-check counts

After the election every vote counted on election night is counted again under the supervision of the returning officer for each electoral district.

The returning officer also looks closely at all the ballot papers that were placed in the informal pile on election night. Some ballot papers may in fact be formal and can be counted. Some ballot papers that don’t have all the preferences marked on them can be accepted as formal if they match a voting ticket lodged by a candidate.

Any updates to the results after the re-checks have been done are published on the ECSA website and in the media.

Counts conducted in the week after polling day

Postal, early and declaration votes are counted from the Monday after polling day. 

Declaration vote counts

Most votes are counted on election night. But postal votes, early votes and all other types of declaration votes are not counted until the week after polling day.

Before they can be counted, tens of thousands of early votes need to be securely transported to our central processing centre, sorted and then delivered to the returning officer for each district. Tens of thousands of postal votes arriving from South Australia, interstate and overseas will be delivered to returning officers each day by Australia Post until the Saturday 7 days after polling day.

All these ballot papers need to be validated against the electoral roll before we can count them. Returning officers count them progressively during the week after polling day. The counting process for declaration votes is no different to the process described above. Returning officers continue to update the first preference results and 2CP results throughout the week, as more ballot papers get added to the count.

Distribution of preferences

On the Sunday, 8 days after polling day, the returning officer brings together all the ballot papers and conducts a final count. Ballot papers are grouped together into separate piles for each candidate and then preferences are distributed until only 2 candidates remain in the count.

A candidate is elected as soon as they receive an absolute majority of votes. In some cases, candidates get an absolute majority of first preference votes and are elected without us needing to distribute preferences to determine the winner. But if no candidate has more than 50% of the votes on first preferences, a distribution of preferences is needed. To learn about how we determine the winner see how the House of Assembly result is determined.