22 March 2013
For Interstate purchase, in the invoice need to add the CST, CST percentage is based on your C form applicable or not. if C form apply then rate will be 2% otherwise local vat rate apply as CST. you need to check with your chennai supplier about their invoice, why they not shown the tax
24 March 2013
1. Yes. if C form not apply Local vat rate charged as CST. vat rate of the origin of the goods.since goods you are purchase from tamilnadu then local vate rate of tamilnadu is apply as CST.
2. Yes, incase the particular product got exempted from VAT, CST as well exempted