Today is the last day to submit your postal vote for the same-sex marriage survey in order to ensure that it arrives at the Australian Bureau of Statistics office by the November 7 deadline.
"Throughout the survey, it's been our aim to make sure every eligible Australian is given the opportunity to have their opinion counted," ABS Deputy Statistician and Taskforce Lead Johnathan Palmer said.
"That's why we're asking people not to leave it until the last minute to get their form back.
"Time is running out. Don't delay and send your form back straight away.
"If you don't get your form back to us in time, it will not be included in the final results."
Nearly 12 million eligible forms have been received by the ABS, which is roughly three out of four people.
However, there remain approximately 4 million people who are yet to submit their forms.
The vote closes at 6pm on November 7, with the result to be announced on November 15.