Post sale discounts: input tax credit preserved unless discounts form inducement under an agreement as consideration. Where suppliers issue commercial or financial credit notes without reducing the original transaction value, the supplier's tax liability remains unchanged and the recipient retains full Input Tax Credit; generally, post sale discounts paid by manufacturers to dealers that simply lower the dealer's sale price are not consideration for the dealer's supply to the end customer absent an agreement with the end customer, but when a manufacturer-agreed discount to an end customer is enabled by credit notes to the dealer, that discount is part of the overall consideration as an inducement; discounts are not consideration for promotional services unless distinct services are provided under an express agreement with defined consideration.