Treatment of Post-Sale Discounts and Rebates: Section 153B Updates#
The Historical Problem with Post-Sale Discounts#
In industries like FMCG, Pharmaceuticals, and Automobiles, offering post-sale discounts (like year-end volume rebates or target-based incentives) is a standard trade practice. Historically, under Section 15(3)(b) of the CGST Act, a supplier could issue a Credit Note and reduce their GST liability for a post-sale discount only if two strict conditions were met:1. The discount was established in terms of an agreement entered into at or before the time of the original supply.2. The buyer (recipient) reversed the corresponding Input Tax Credit (ITC) attributable to the discount. The first condition was practically impossible to meet for many businesses. Dynamic market conditions often force companies to offer ad-hoc festive discounts, stock-clearance rebates, or secondary market support that were never documented in a pre-existing agreement. Because of this, companies could not reduce their GST liability when issuing credit notes for these discounts, leading to a higher effective tax burden.
The Relief: Section 153B of the Finance Act 2026#
Recognizing this commercial reality, the legislature introduced changes via the new Section 153B.
The most significant change is the dropping of the strict condition requiring a pre-established agreement for certain classes of trade discounts. Under the new framework, a supplier can issue a GST Credit Note to pass on a post-sale discount, and subsequently reduce their outward tax liability, provided:1. The discount is passed on through a valid GST Credit Note linked to the original invoices.2. Crucially: The recipient unequivocally reverses the corresponding ITC.
The Burden Shifts to ITC Reversal Verification#
While the removal of the "pre-agreement" clause is a massive relief, the government has tightened the technological enforcement of the second condition.
You cannot simply issue a Credit Note and immediately reduce your tax liability. The GST portal's matching system will now ensure that your tax liability is reduced only after the buyer has actually declared the Credit Note in their GSTR-3B and reversed the ITC.
If the buyer fails to reverse the ITC, the supplier will face a demand notice for the short-paid tax along with interest.
Commercial Impact#
This amendment is a major win for the FMCG and auto sectors. It allows for much more aggressive, dynamic pricing and secondary channel support without the fear of absorbing the GST cost of ad-hoc discounts. However, it requires robust vendor/dealer management. Finance teams must rigorously follow up with their dealer networks to ensure that whenever a volume discount credit note is issued, the dealer promptly reverses the ITC in that very month's return.