The Tamil Nadu Migration Survey (TMS 2015) was commissioned by the Non Residence Tamils (NRT) Welfare Board under the Commissioner of Rehabilitation, Tamil Nadu, through funding from the Tamil Nadu Planning Commission. Additional resources were provided by the Loyola Institute of Social Science Training and Research, Loyola College (autonomous) Chennai, Centre for Diaspora Studies, M S University, Tirunelveli, Central University of Tamil Nadu, Thiruvarur and Rajiv Gandhi National Institute of Youth Development and Centre for Development Studies, Thiruvananthapuram. We are grateful to B. Anand IAS, Principal Secretary and Commissionerate of Rehabilitation and Welfare of Non Resident Tamils and Vice-Chairperson - Santha Sheela Nair, State Planning Commission, Government of Tamil Nadu and and K. Ramesh of NRT. This is an abridged version of the larger report prepared by the authors for the Tamil Nadu Planning Commission. Larger version can be obtained from the Authors. We are also thankful for the referees for the constructive comments.