The transfer of assets between Idea and its unit Aditya Birla Telecom were subject to capital gains tax according to tax officials, the Economic Times reported, citing an unidentified person close to the development.
The company, part of the $40 billion Aditya Birla Group conglomerate, said on Friday it believed the demands were "unjustified and based on erroneous interpretation of current tax laws".
Idea is evaluating options including challenging the tax demand, the company added.
($1 = Rs. 54.8350)