The tax sleuths had earlier searched the residence of P Rama Mohana Rao, when he was the chief secretary of the state. In a rare instance, the officials also searched his office at the secretariat during the time.
I-T officials have been conducting raids in various parts of the country to book tax evaders in the recent past.
The raid also comes at a time when the All India Anna Dravida Munnetra Kazhagam (AIADMK) government is facing a by-election amid a split in the party. Two AIADMK factions, one led by party secretary V K Sasikala and her relatives and the other lead by former chief minister O Panneerselvam, are contesting the election, apart from the Opposition Dravida Munnetra Kazhagam and a party formed by Deepa Jayakumar, niece of late J Jayalalithaa.