GST Post-Sale Discounts & Credit Notes Explained

The 56th GST Council meeting held on September 3, 2025 brought one of the biggest relief measures for Indian businesses dealing with post-sale discounts. The government has amended Section 15(3)(b) and Section 34 of the CGST Act, removing the long-standing requirement of a pre-supply agreement before a discount can reduce taxable value. Now, as long as a GST credit note is issued and the recipient reverses the Input Tax Credit (ITC), the discount qualifies for reduction in taxable value – no pre-agreement needed. This article explains what changed, how it affects your business, and what action steps you should take right now.

Amendment Summary

What Changed and Why It Matters

Before this amendment, Section 15(3)(b)(i) required that any post-sale discount must be agreed upon before or at the time of the original supply, and it had to be linked to specific tax invoices. This was a major compliance headache.

If a supplier offered a loyalty bonus or a performance-linked discount after the invoice was already raised – say, at the end of a quarter – it often did not meet the legal conditions under Section 15(3)(b). The supplier could not reduce GST liability through a credit note. Instead, they had to issue a commercial credit note without any GST impact, which left both parties in an awkward position regarding ITC.

Now, both these conditions have been dropped. A post-sale discount can reduce taxable value simply if:

• The supplier issues a GST credit note under Section 34, and
• The recipient reverses the ITC attributable to that discount.

The Circular No. 212/6/2024-GST which had required CA/CMA certificates or written undertakings to prove ITC reversal has also been rescinded as part of this reform.

What Changed in Section 34 (Credit Notes)

Section 34 governs when a supplier can issue a credit note that adjusts GST liability. Historically, post-sale discounts were not explicitly covered here unless they met the conditions in Section 15(3)(b).

The amendment adds a direct cross-reference between Section 34 and Section 15(3)(b). This makes it legally clear that a GST credit note can be issued specifically for post-supply discounts provided the ITC reversal condition is met.

When Must You Issue a GST Credit Note?

• Taxable value or tax charged in the original invoice is higher than what was actually payable
• Goods supplied are returned by the recipient
• Deficiency in goods or services supplied
• Post-sale discount given after the supply – now explicitly covered

A credit note for post-sale discounts must be issued before November 30 of the financial year following the one in which the original supply was made, or before filing the annual return – whichever is earlier.

Role of IMS (Invoice Management System) in ITC Reversal

Since the CA/CMA certificate requirement has been dropped, how does a supplier confirm that the recipient has actually reversed ITC? The answer lies in the Invoice Management System (IMS) on the GST portal.

IMS allows recipients to accept or reject credit notes issued by suppliers. When a supplier issues a credit note and the recipient accepts it on the IMS portal, it creates a digital trail confirming ITC reversal. This replaces the older, manual certificate-based mechanism.

Best Practice for ITC Handling

• First, claim ITC under ‘All Other ITC’ in your GSTR-3B
• If the ITC later turns out to be ineligible (e.g., credit note received), reverse it
• This approach avoids interest liability, since reversal done proactively does not attract interest
• Track all credit notes issued against post-sale discounts in your accounting system
• Match IMS data regularly to ensure recipients have accepted your credit notes

Practical Tips for Businesses

Open Issues and Pending Clarifications

While the amendment is a significant step forward, a few grey areas remain. The term ‘discount’ itself has not been redefined in the law. This leaves open questions such as:

• Can surprise or unannounced discounts (e.g., stock liquidation deals) qualify under the amended provision?
• Will the distinction between discounts and third-party consideration (services) still apply?
• How will the tax authorities treat situations where a manufacturer passes discounts through dealers to end consumers?

Businesses should watch for new CBIC circulars that are expected to clarify these finer points. The deletion of Circular 212/6/2024 has removed the old compliance roadmap, and a replacement framework is anticipated.

Conclusion

The amendment to Section 15(3)(b) and Section 34 of the CGST Act is a welcome reform that significantly simplifies how post-sale discounts are handled in GST. By removing the pre-agreement condition and the CA/CMA certificate burden, the government has made it much easier for businesses to legitimately reduce taxable value through credit notes. The key takeaway is straightforward: issue a GST credit note under Section 34 and ensure your recipient reverses the ITC via the IMS portal. Update your internal processes, train your team, and monitor the GST portal regularly. A few grey areas around what qualifies as a ‘discount’ still need official clarification, so watch for upcoming CBIC circulars.

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Frequently Asked Questions (FAQs)

1. Do I still need a prior agreement to give a post-sale discount under GST?

No. The amendment to Section 15(3)(b) removes the requirement for a pre-supply agreement. A post-sale discount can now reduce taxable value if you issue a GST credit note under Section 34 and the recipient reverses the related ITC.

2. Is ITC reversal by the recipient still mandatory?

Yes. Even under the new rules, the recipient must reverse the ITC attributable to the discount. This is tracked through the IMS system on the GST portal.

3. What happened to the CA/CMA certificate requirement?

Circular No. 212/6/2024-GST has been rescinded. You no longer need CA or CMA certificates or undertakings from recipients to prove ITC reversal. The IMS portal now serves as the verification mechanism.

4. What is the deadline to issue a GST credit note for a post-sale discount?

A credit note must be issued before November 30 of the financial year following the supply, or before filing the annual return – whichever comes first.

5. Can I issue a commercial credit note instead of a GST credit note?

Yes, but a commercial credit note does not reduce your GST liability. To benefit from a lower taxable value and recover the tax paid on the discounted amount, a GST credit note under Section 34 is the right instrument.