(i) Appropriate duty is payable only if the process amounts to manufacture. On this very basis exemption to job worker was granted vide Notification No. 25/12-ST dated 20.06.12 as amended.
(ii) Central Excise duty and Service Tax both cannot be charged simultaneously on the same activity or process. Either CE duty is leviable or Service Tax is leviable. If CE duty has been paid, exemption from Service Tax is available to the job-worker otherwise not.
FIRST SCENARIO (IF THE PROCESS AMOUNTS TO MANUFACTURE)
(i) If any activity or process amounts to manufacture, Central Excise duty is leviable/payable and exemption to job worker from Central Excise duty is available only if CE duty has been paid on the final product by the principal manufacturer. A job worker works for and on behalf of the principal manufacturer. The principal manufacturer is responsible for discharging Central Excise duty liability. The whole liability is cast upon the principal manufacturer.
(ii) If any process carried out by the job worker amounts to manufacture, the cost of job-worked goods is to be included in the cost of the manufacture of the final product for the purpose of payment of Central Excise duty. Here the cost of job-work carried out by both job workers (A & B) will be included in the cost of the manufacture of the final product for the purpose of payment of duty.. Since the whole Central Excise duty stands paid/payable by the principal manufacturer, so exemption from CE duty is admissible to both job workers (A & B) due to inclusion of the cost of job work in the cost of manufacture of the final product.
(iii) in view of the duty payable/paid by the principal manufacturer, exemption from CE duty is admissible to both job-workers and NOT from Service Tax.
SECOND SCENARIO (IF THE PROCESS DOES NOT AMOUNT TO MANUFACTURE)
(i) If any process does not amount to manufacture, Service Tax is leviable/payable on the activity/process, if otherwise not exempted from ST specifically. The querist at serial no. 7 above has informed that the fettling of castings does not amount to manufacture
(ii) In the instant case, the activity or process does not amount to manufacture, so Service Tax is leviable/payable on the process or activity carried out by both job workers.
(iii) Since the querist's activity or process falls in the Second scenario, ST is leviable. B will charge Service Tax from A and A will charge Service Tax from principal manufacturer. Notification No. 25/12-ST dated 20.6.12 as amended is not applicable to both job workers inasmuch as their activity or process does not amount to manufacture.