Can a referendum or plebiscite be held at the same time as a federal election?
Generally speaking, yes. These different types of votes could be held at the same time.
In fact, since 1901 there have been 8 times when referendums were held at the same time as a federal election. These dates are:
- 12 December 1906
- 13 April 1910
- 31 May 1913
- 13 December 1919
- 17 November 1928
- 28 September 1946
- 18 May 1974
- 1 December 1984.
To date, there has not been a plebiscite held at the same time as a federal election in Australia.

People line up outside a polling station on referendum day, Brisbane, 1899.
State Library of Queensland, Image No. 109589
People line up outside a polling station on referendum day, Brisbane, 1899.

State Library of Queensland, Image No. 109589
Description
A black and white photograph of a group of men, women and children (and a dog) gathered around the entrance of a low building. A sign reads 'Polling Booth Brisbane North'.