Job work exemption permits sending inputs and capital goods to job workers tax-free subject to return, supply, and accounting conditions. The provision permits a registered principal to send inputs and capital goods to a job worker without payment of tax subject to prescribed intimation and conditions; the principal must bring back such goods within specified periods or supply them from the job worker's premises on payment (or with/without payment for export). The principal must keep proper accounts and declare the job worker's premises as an additional place of business unless exceptions apply. Failure to return or supply within the periods results in those goods being deemed supplied by the principal on the date they were sent out. Waste and scrap may be supplied by the registered job worker on payment of tax or by the principal if the job worker is unregistered.