The department had carried out country-wide searches in this case last month.
After charges were slapped against him, Bihar Deputy Chief Minister Tejashwi Yadav called it vendetta politics. The department has seized properties raided in May.
In a big setback for RJD chief Lalu Prasad Yadav and his family, the Income Tax (I-T) department has slapped charges against the RJD chief's wife, daughter and son under Benami Transactions Act. The deed value of these properties is Rs 9.32 crore, but the I-T department has estimated the market price of such immovable assets to be Rs 170 - 180 crore.
The IT department said it has attached farm houses, land and buildings in Delhi and Patna, including plots in the Bihar capital where a mall was to be built.
Benami properties are those which are purchased in the name of someone else than the actual beneficiary.
Tax department officials had said Mr. Prasad's kin held some of the properties under their scanner in a "benami" way.
In this case, a chartered accountant, Rajesh Kumar Agrawal, allegedly linked to Bharti and others, was also arrested by the Enforcement Directorate (ED) on May 22.
"Investigation is ongoing and necessary action has been taken today (Monday)", said an I-T official, requesting anonymity.
Agrawal is alleged to have aided in illegal transactions involving Prasad's kin. The RJD chief, earlier, had put up a courageous face after the I-T raids in this case, saying he was "not scared at all" and would continue to fight against the "fascist forces". If it tries to silence one Lalu, crore of Lalu will come forward. The BJP had also accused Prasad, Bharti, Tejashwi and his other son Tej Pratap of involvement in corrupt land deals worth over Rs 1,000 crore, and had asked the central government to probe such transactions.