The former member for Wagga Wagga, whose clandestine relationship with ex-NSW premier Gladys Berejiklian led to her political downfall, appeared at Sydney's Downing Centre Courthouse for the verdict on Friday.
Magistrate Clare Farnan ruled that Maguire misled the NSW Independent Commission Against Corruption while giving evidence during a hearing in July 2018.
Immediately after handing down her decision, Maguire applied to suppress the finding.
His barrister argued publicity about his guilt would prejudice a jury in an upcoming trial over an alleged visa fraud conspiracy expected to commence in September.
The bid was opposed by the ABC and Nine but backed by federal prosecutors.
Ms Farnan rejected Maguire's application.
"The interests of the community in open justice is in my view not outweighed by Mr Maguire's interests," the magistrate said.
The magistrate's reasons for determining Maguire's guilt are not yet clear after media and the former MP himself were caught in an administrative mix-up.
Another court official on Friday adjourned the case to October only for the magistrate on another level to hand down her decision, without media present.
At ICAC, Maguire was asked about what he expected to get out of the sale of an estimated $48 million property development in Campsie in Sydney's southwest.
During the criminal hearing earlier in 2025, prosecutors claimed Maguire changed his evidence during questioning over claims he was not expected to be reimbursed.
He will face a sentence hearing on August 15.
ICAC grilled Maguire and others in 2018 under Operation Dasha, which probed allegations of corruption at the local council.
The Wagga Wagga MP resigned from the Berejiklian government after giving evidence, before succumbing to pressure and quitting parliament altogether.
ICAC opened a further probe into Maguire, exposing his secret romantic relationship with Ms Berejiklian in 2020.
She also stood down from her role and was later found by ICAC to have breached public trust in failing to disclose the relationship, spanning at least five years while she was transport minister, treasurer and then premier.
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