The short answer
Australia’s 2017 marriage-law change involved several distinct decisions. A voluntary postal survey measured public views; parliament then considered and passed legislation; royal assent and commencement followed. Treating these as one vote obscures who held legal authority and what the survey result meant. The sequence also belongs to a longer history of campaigning and disagreement about whether equal access to marriage should be put to a public poll.
Chronology
A timeline of the turning points
Definition inserted into the Marriage Act
The Howard government’s amendments expressly define marriage in opposite-sex terms.
Plebiscite proposal blocked
The Senate does not pass the government’s planned compulsory plebiscite.
Voluntary postal survey
The ABS conducts a nationwide survey asking whether the law should allow same-sex couples to marry.
Results and legislation
The ABS announces a majority yes response; the amendment Bill is introduced in the Senate.
Senate passage
The Senate agrees to the third reading of the amendment Bill.
Passage and assent
The House passes the Bill on 7 December; royal assent follows on 8 December.
Main changes take effect
Marriage is no longer restricted by the sex or gender of the couple under the amended law.
The legislative question emerged from a longer campaign
The 2017 reform followed decades of work by LGBTQIA+ communities and supporters. Earlier reforms to criminal laws, discrimination protections and recognition of relationships did not themselves create equal access to marriage.
In 2004, the Howard government amended the Marriage Act to expressly define marriage in terms of a man and a woman. Subsequent marriage-equality Bills failed or lapsed. This history explains both the specific provision reformers sought to change and why supporters did not regard the question as a new initiative invented by Malcolm Turnbull’s government.
A voluntary survey replaced the planned compulsory plebiscite
The Coalition went to the 2016 election proposing a compulsory national plebiscite. After the Senate blocked that route, the government proceeded with a voluntary postal survey conducted by the Australian Bureau of Statistics.
The survey was a consultation about changing ordinary legislation, not a constitutional referendum. Its outcome did not itself amend the Marriage Act or legally bind parliamentarians. Contemporary TIME reporting described the government’s promise to allow parliamentary consideration after a yes result and the continuing division within the Coalition. Turnbull supported yes, but public consultation and legislative authority remained separate.
The result needs both its percentage and its denominator
On 15 November 2017, the ABS reported 7,817,247 yes responses and 4,873,987 no responses. Yes represented 61.6 per cent of people who expressed a view; no represented 38.4 per cent. Participation was 79.5 per cent of eligible Australians.
These are different measures. The result was not a finding that 61.6 per cent of every Australian resident voted yes, and non-response should not be counted as a no response. Every state and territory returned a majority yes among expressed views. The official totals establish the consultation’s result, rather than the legal effect of subsequent legislation.
Sources for this section: [2]
Parliament still had to debate and enact a change
The Marriage Amendment (Definition and Religious Freedoms) Bill was introduced in the Senate on 15 November 2017. Parliamentary records show Senate passage on 29 November and final passage through both Houses on 7 December. Royal assent followed on 8 December.
The Act amended the definition of marriage and related provisions, rather than replacing the entire marriage system. It also addressed religious celebrants and protections relating to solemnisation. Thus the final text, not the survey question by itself, determined the law’s scope. Parliamentary passage, assent and commencement should not be compressed into a single date.
The main amendments commenced on 9 December, not in January
The Act’s commencement table and the Attorney-General’s Department establish 9 December 2017 for the main changes. From that date, the right to marry was no longer determined by sex or gender. Overseas same-sex marriages also became generally recognised under Australian law.
Ordinary marriage requirements continued to apply. January 2018 is often associated with weddings after the normal notice period, but it is not the commencement date of marriage equality. A narrative that starts legal recognition in January misses the December change and the recognition of existing overseas marriages. This guide describes the historical reform, not individual legal advice.
A successful reform did not make the process uncontested
Some supporters objected to subjecting equal rights to a public survey at all. Others considered the consultation politically necessary, while opponents of changing the law campaigned for no. A majority result did not mean the debate had no personal cost.
On the results day, the Australian Psychological Society welcomed the outcome but said people had experienced physical or psychological abuse during the debate and needed support. Its statement is evidence of a professional body’s contemporaneous concern, not a count of every person harmed. The distinction allows an account to recognise both the legislative achievement and disagreement about the path taken to reach it.
Biography context
Explore Australia through connected lives
Connected biographies
Prime ministers in the legislative history
1954–
Malcolm Turnbull
Prime minister, lawyer, businessman and republican advocateMalcolm Turnbull moved from journalism, law and investment banking into Liberal politics. Australia’s prime minister from 2015 to 2018, he governed through a narrow parliamentary majority and deep divisions within his party.Read biography
1939–
John Howard
Former Australian treasurer and Australia’s 25th prime ministerA Sydney solicitor who became treasurer, twice led the opposition and served as prime minister from 1996 to 2007 before losing government and Bennelong.Read biographyQuick answers
Common questions
- Did the postal survey itself change the law?
- No. The voluntary survey was non-binding. Parliament had to pass legislation, which then received royal assent and commenced.
- What did the 61.6 per cent yes result mean?
- It was the yes share among eligible participants who expressed a view, not among every Australian. The ABS reported participation of 79.5 per cent of eligible Australians.
- When did parliament pass the marriage-equality Bill?
- The Senate passed it on 29 November 2017 and it completed passage through both Houses on 7 December. Royal assent followed on 8 December.
- When did the main legal changes take effect?
- On 9 December 2017. January 2018 wedding dates after the normal notice period should not be confused with legal commencement.
- Was this a referendum to amend the Constitution?
- No. It concerned a change to the Marriage Act, an ordinary federal statute, not a constitutional amendment.
Primary and institutional sources
How this history was checked
ABS results control the numerical denominators. Parliament’s Bill record supplies passage and assent dates; the enacted commencement table and Attorney-General’s Department control the December start date. Museum history, contemporary TIME reporting and the APS statement establish campaigning and objections without claiming universal views or measured harm. The photograph shows Turnbull in March 2013, not during the survey or the December vote. This article was reviewed on 24 October 2026.
- National Museum of AustraliaMarriage equality: campaigning, the 2004 law and the postal survey
- Australian Bureau of StatisticsAustralian Marriage Law Postal Survey 2017: national results, 15 November 2017
- Parliament of AustraliaMarriage Amendment (Definition and Religious Freedoms) Bill 2017: progress and assent
- Federal Register of LegislationMarriage Amendment (Definition and Religious Freedoms) Act 2017: as made
- Attorney-General’s DepartmentMarriage equality in Australia: commencement and recognition of overseas marriages
- TIMEAustralia Has Its Say on Same-Sex Marriage, 5 October 2017
- Australian Psychological SocietyResponse to the yes vote and concerns about the debate, 15 November 2017
- Eva Rinaldi / Wikimedia CommonsMalcolm Turnbull, Driving Miss Daisy opening, 2 March 2013: Flickr-reviewed CC BY-SA 2.0 photograph