20 March 2012
As per section 8(1)(b) of CST Act,If the selling dealer pays CST @ 2% or lower, he has to produce proof to his sales tax assessing authority that the purchasing dealer is eligible to get these goods at concessional rate.
If the basis of a claim for credit or refund is that a customer gave you an exemption certificate♦ after you remittedthe tax with your return, you must send copies of the ex-emption certificates, invoices and credit memoranda involved in the claim. If your customer originally paid you sales or use tax then submitted an exemption certificate requesting a credit or refund of the tax, you must send, with your claim, proof of repayment of the tax to the customer, such as a copy of the canceled check or a credit memo Submit documents in a format suitable to determine thecorrect amount of refund or credit(e.g. invoices,exemption certificates, credit memoranda, etc.)