Secondary and post-sale discounts under GST clarified for input tax credit, consideration, and dealer promotional services. Clarification is issued on the GST treatment of secondary or post-sale discounts, and the circular is made applicable mutatis mutandis under the TNGST Act, 2017 for uniform implementation. Where a recipient makes discounted payment to a supplier on the basis of a financial or commercial credit note, the recipient is not required to reverse input tax credit, because the original transaction value is not reduced. Post-sale discounts to dealers are not treated as consideration for onward supply or for a separate supply of services unless an agreement expressly provides for identified services with defined consideration.