The real estate company Signa is the target of investigations by the Austrian Economic and Corruption Prosecutor's Office (WKStA).
Several Austrian media reported on Tuesday that Signa Holding had been searched.
The company, which is controlled by the Tyrolean investor René Benko, did not give a statement on request.
According to the reports, between 2016 and 2018 an "Austrian entrepreneur" allegedly offered a senior employee in the Ministry of Finance a benefit - namely a well-paid managerial position in this group - for partisan support in the tax audit process of his group, so that it could be closed no or the lowest possible tax assessment.
Michael Seiser
Business correspondent for Austria and Hungary based in Vienna.
Follow I follow
The WKStA spoke of house searches at two company locations.
"The investigators from the Public Prosecutor's Office for Economic Affairs and Corruption were apparently looking for documents from appraisers who had valued one or more of the group's properties in Vienna," the daily newspaper "Standard" also reported.
Benko had already been questioned in the Ibiza-U committee because he had been named as a supposed party donor by the former chairman of the FPÖ, Heinz Christian Strache, in the well-known "Ibiza video" - about the freedom's willingness to corrupt.
One of the topics of his survey was the immense increase in value of the Postal Savings Bank - a historic Art Nouveau building - in Vienna a few years after it was acquired by the investor.
Or the purchase of the furniture store Kika-Leiner,
in which the high-ranking employee of the Ministry of Finance, Thomas Schmid, was involved at the time and a court was said to have been opened in order to be able to process the transaction over the Christmas holidays.
The opposition also wants to question the real estate investor in the current ÖVP corruption investigation committee.
All strands of investigation that resulted from the Ibiza video are summarized in the pending proceedings.
In this context, the WKStA is investigating around four dozen suspects (natural persons and associations) on suspicion of infidelity, false testimony, abuse of official authority, corruption, bribery and violation of official secrecy in various forms of participation.
The department store group Galeria Kaufhof Karstadt, which has already received financial aid from German taxpayers twice and has now got into trouble again, also belongs to Signa Holding.