The controversial figure had her visa rejected by Home Affairs Minister Tony Burke in October 2024, ahead of a planned speaking tour throughout November as it was alleged she would "incite discord".
The High Court will rule on her appeal on Wednesday.
Owens argued her visa rejection went against implied freedom of political communication.
The character test on which visa decisions are made was more likely to exclude non-mainstream political views by saying they sparked division, her lawyers argued.
Perry Herzfeld SC contended the threshold of "inciting discord" to reject a visa on character grounds was so broad it could capture disagreements and robust debates and was "very much in the eye of the beholder".
This meant visas could be withheld from people who "will stimulate debate ... the minister doesn't like", he argued in the High Court in May.
Legal provisions saying a person couldn't attack Australian values were equally broad, he argued, saying the spectrum of what was an acceptable mainstream view changed over time.
He pointed to the decriminalisation of homosexuality and the legalisation of same-sex marriage.
Owens downplaying the impact of the Holocaust and claiming Muslims started slavery meant "Australia's national interest is best served when Candace Owens is somewhere else", Mr Burke said at the time.
The minister took into account the commentator being known for "controversial and conspiratorial views in relation to the Muslim, Black, Jewish and LGBTQI+ communities and her use of online platforms to promote her right-wing extremist views and ideology to foster division and fear", court documents read.
The Commonwealth contends Owen could encourage extremist behaviour, risk vilifying parts of the community or incite civil unrest if she were allowed into Australia and this constituted an unacceptable risk.
The court documents pointed to her being named in the manifesto of the man who claimed responsibility for a massacre at two New Zealand mosques.
The "incite discord" threshold to reject a visa on character grounds was intended to cover the more serious end of the spectrum, Solicitor-General Stephen Donaghue KC told the High Court during the May hearing.
Owens has more than 4.2 million subscribers on YouTube and 5.7 million on Instagram.
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