Trade discount means difference between declared price and actually charged price from the buyer at the time of supply (sale) or after the supply ( sale).Cash discount is one of the types of trade discounts. Other trade discounts are quantity discount, annual turnover discount, off-season discount, conditional discount etc. Trade discounts must be passed on to the buyers. Trade discount is admissible in GST. Trade discount does not form the part of transaction value as per Section 15 (3) of CGST Act for the purpose of payment of GST.
Discount can passed on by way of credit note. Post sale (supply) trade discount is specifically provided under Section 15(3)(b)(i) of CGST Act with the condition that it has to be established via agreement before the time of supply and specifically linked to relevant invoice. ITC has to be reversed by the buyer attributable to the discount under Section 15 (3)(b)(ii) of CGST Act.
GST is applicable on the price difference (excess amount charged) by way of Debit Note.
If trade discount is not passed on to the buyer, the supplier will invite interest and penalty along with GST payable on the amount of discount not passed on.