Relevant extract of An Education Guide issued by CBEC in 2012
4.6.2 Would service tax be leviable on processes on which Central Excise Duty is leviable under the Central Excise Act, 1944 but are otherwise exempted?
No. If Central Excise duty is leviable on a particular process, as the same amounts to manufacture, then such process would be covered in the negative list even if there is a central excise duty exemption for such process. However if central excise duty is wrongly paid on a certain process which does not amount to manufacture, with or without an intended benefit, it will not save the process on this ground.
If process amounts to manufacture on which duty of Central Excise is leviable under Section 3 of Central Excise Act, 1944 is covered under Section 66 D(f).
See also Notification No.7/17-ST dated 1.2.17 which is applicable from the date of enactment. (still not enacted). Relevant extract is here:-
2. In paragraph 2, after clause (y), the following clause shall be inserted with effect from the date on which the Finance Bill, 2017 receives assent of the President, namely: -
“(ya) “process amounting to manufacture or production of goods” means a process on which duties of excise are leviable under section 3 of the Central Excise Act, 1944 (1 of 1944), or the Medicinal and Toilet Preparation (Excise Duties) Act, 1955(16 of 1955) or any process amounting to manufacture of opium, Indian hemp and other narcotic drugs and narcotics on which duties of excise are leviable under any State Act for the time being in force;”.