When you are exporting the finished goods, you can get inputs (raw materials) without payment of excise duty under various schmes-
-Inputs free of custom duty, CVD, SAD etc. through Adance authorisation; locally you can procure without payment of Central excise duty under Rule 19(2) of Central Excise rules; you can also procure through invalidation of advance auhorisation.
-The other option is to procure on payment of duty and take back the duty through CENVAT, or refund of cenvat under Rule 5 of Cenvat Credit rules or taking rebate on inputs or export of goods after payment of duty and taking rebate under Central Excise Rule 18&19.
-Another option is to take back duty through drawback (AIR or brand rate or special brand rate), or through retrun of duty paid on deeming provision like DEPB or taking advance authorisation on post export basis.
The principles on these scheme is very same- goods should be exported and taxes should not be exported. Which scheme is to be opted depends upon the nature of goods exported, nature of manufacturing process and nature of inputs required. Say, for example if raw material is priced lower in India, no need to import raw material on advance authorisation. As consultants to the industry, we need to develop a understanding of the mechanism so that we can advice the industry and exporting community suitably.