The Distributor's Discount That GST Refused to Recognise: Post-Sale Discounts Under Section 15(3)

A mid-sized FMCG distributor in Pune, whom we will call Sharma Distributors, moved packaged foods and personal care products to nearly 300 retailers. To push volumes, the business ran a familiar trade practice: retailers who crossed certain quarterly purchase targets received a discount, passed on later through a credit note.

Everything looked normal until the annual GST reconciliation. That is when the trouble surfaced.

The Problem: A Discount That Did Not Reduce Tax

Sharma Distributors had issued credit notes worth several lakh rupees as post-sale volume discounts. The accountant assumed these credit notes would automatically reduce the taxable value and, therefore, the GST payable.

But GST does not work on assumptions. Under Section 15(3) of the CGST Act, a discount can be excluded from the taxable value only in two situations:

• If the discount is given at or before the time of supply and is recorded in the invoice itself; or
• If the discount is given after supply, but it was agreed upon before or at the time of supply through an agreement, is specifically linked to relevant invoices, and the recipient has reversed the input tax credit attributable to that discount.

Sharma's quarterly discounts were decided informally, sales-target style, with no pre-agreed written arrangement and no linkage to specific invoices. The credit notes also did not confirm that retailers had reversed their proportionate ITC.

During scrutiny, the officer's position was straightforward: the post-sale discount did not satisfy Section 15(3)(b). So the tax value could not be reduced, and the GST originally charged remained payable. Sharma faced a demand on the discount amount he thought he had legitimately knocked off.

How They Solved It Correctly

Working with their consultant, Sharma Distributors restructured the entire discount mechanism instead of arguing over past mistakes.

Step 1: Put the discount policy in writing before supply

They drafted a distributor-retailer agreement clearly stating the volume slabs and discount rates, signed at the start of the financial year. This satisfied the requirement that the discount be established before or at the time of supply.

Step 2: Link credit notes to invoices

Each credit note now referenced the specific invoices to which the discount applied, so the discount was traceable and not a lump-sum adjustment.

Step 3: Ensure ITC reversal by retailers

They used financial credit notes (without GST) for discounts that could not meet all conditions, and commercial GST credit notes only where retailers confirmed ITC reversal. This distinction is critical: a financial credit note is a pure commercial adjustment and does not reduce GST, while a tax credit note under Section 34 reduces liability only when all Section 15(3) conditions are met.

Step 4: Reconcile before filing

Going forward, discounts were reconciled every quarter, with credit notes reflected within the Section 34 timeline, before the November return of the following year.

The result: the discount structure became compliant, future liability was correctly reduced, and the risk of repeat demands disappeared.

The Key Lesson

A discount is not automatically deductible from GST value just because you issued a credit note. For post-sale discounts to reduce your tax, three things must line up: a prior agreement, invoice-level linkage, and ITC reversal by your buyer. If any one is missing, treat it as a financial (commercial) discount that does not touch your GST liability.

Many distributors, wholesalers, and manufacturers lose this benefit purely on documentation, not on intent. The tax is real; the paperwork decides whether the relief is real too.

How GSTClear Helps

GSTClear flags credit notes that are not linked to underlying invoices and separates tax credit notes from purely financial ones, so you never wrongly reduce your liability. It reconciles your outward credit notes against buyer acknowledgements, tracks the Section 34 amendment window, and alerts you when a discount fails a Section 15(3) condition before you file. This turns a risky, manual reconciliation into a clean, audit-ready trail.

If your business runs trade schemes, target discounts, or year-end incentives, do not let good discounts turn into bad tax demands. Set up GSTClear today and make every discount count where it should.

FAQ

Can I reduce GST for any post-sale discount I give?

No. Only post-sale discounts that were agreed before or at the time of supply, are linked to specific invoices, and where the buyer reverses the proportionate ITC can reduce your taxable value under Section 15(3)(b).

What is the difference between a financial credit note and a GST credit note?

A financial credit note is a commercial adjustment that does not reduce GST liability. A tax credit note under Section 34 reduces GST, but only when all Section 15(3) conditions are satisfied.

Is there a deadline to issue a credit note that reduces GST?

Yes. A credit note affecting tax liability must generally be declared by the return of November following the end of the financial year, or the annual return date, whichever is earlier.