It was a slow start to the day with just 24,000 people turning out to cast a vote by lunchtime on Saturday out of more than 130,000 registered in the northern Gold Coast electorate.
That is on top of 36,000 who hit pre-polls and 19,000 postal votes sent out.
Cost of living pressures could sway ballots according to LNP candidate Cameron Caldwell, who is firm favourite to replace former coalition minister Stuart Robert.
Asked if Mr Robert's involvement in the robodebt scandal that engulfed the previous Liberal-Nationals government was impacting voters, Mr Caldwell said they have other things on their minds.
"(Cost of living issues) are really starting to bite in their households and it's whether people can put food on the table and keep the lights switched on," he told Sky News.
"That's really what's on their mind as they walk into the polling booth today."
Under Mr Robert, whose resignation from parliament in May triggered the by-election, the LNP held the seat with a margin of 10.6 per cent after the 2022 national poll.
Robodebt is the name given to an unlawful debt recovery program that saddled almost half a million welfare recipients with hundreds of millions of dollars in false Centrelink debts between 2015 and 2019.
A royal commission investigation into the scheme released earlier this month laid the blame at the feet of senior public servants and coalition ministers including Mr Robert, Scott Morrison, Alan Tudge and Christian Porter.
Labor has tried to use this to bolster its candidate for Fadden, Letitia Del Fabbro, who says any swing to her would be a blow to the coalition in one of their safest seats.
Ms Del Fabbro, who is contesting the seat for the second time, was credited with whittling down Mr Robert's margin from 11.2 per cent at the 2019 federal election to 10.6 per cent.
"Any swing against the LNP would be a loss to them," the nurse educator told reporters on Saturday as she cast her vote.
She agreed cost of living issues had dominated the campaign, although there was also interest in the robodebt scandal and the Indigenous voice to parliament.
"People have definitely been talking to us about the voice and they're interested in hearing about the voice when we're knocking on doors and making phone calls, but it's really the cost of living issues that people are mostly interested in," she said.
Treasurer Jim Chalmers said the average swing against a government in a by-election was about four per cent so anything less would be embarrassing for Opposition Leader Peter Dutton.
"Our expectations are tempered, but we couldn't have put forward a better candidate and we're focused on the issues that matter to people here," he said after handing out how-to-vote cards.
Labor has won Fadden only once - in 1983 under the election of the Hawke government.
Prime Minister Anthony Albanese isn't expecting a result like the historic Aston by-election, which Labor claimed in April, after the resignation of former coalition minister Mr Tudge.
"That was an extraordinary result the first time in 100 years that the government have won a seat off the opposition," he said on Friday.
A total of 13 candidates are running in Fadden including from the Greens, Pauline Hanson's One Nation and the Australian Democrats.
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