Hi
if you are paying TA under reimbursement against travel reimbursement, it do not attract ESI. i feel you wanted to consider TA as one component in salary structure and looking for an exemption? if you say so, you may get away from ESI, but you need to cover them Workmen Compensation and Group personal accident policy and mediclaim insurances as welfare measure. As ESI covers from all the above, it would be good to make employees members to ESI, releived of from risk involved from seeking exemption. However, above ins cover is necessary for the employees drawing more then the ESI limit