He was Managing Director of Indian Aluminum Company Ltd. (INDAL) from 1991 to 1998. He also served as Chairman of Confederation of Indian Industries (CII), Eastern Region, as well as on a number of national committees of CII. Currently he is a Member of State Planning Board, West Bengal and Tripura. Tapan is a Director of Tube Investment of India Ltd. and Essel Propack Ltd. He is a member of the Nomination and Remuneration Committee and Audit Committee of Tube Investments of India Ltd. and is also a member of the Audit Committee of Essel Propack Ltd.