Short answer: Under Section 15(3) of India’s Central Goods and Services Tax Act, 2017 (CGST Act), a dealer discount shown on the invoice can be excluded from taxable value when it is given before or at the time of supply. A discount granted after supply reduces taxable value only when three statutory conditions are met: it was agreed at or before supply, it is specifically linked to the relevant invoices, and the recipient reverses the input tax credit (ITC) attributable to the discount on the supplier’s document. A commercial credit note may record a later business adjustment, but issuing one does not automatically reduce the supplier’s original GST liability.
The name used by the parties—rebate, incentive, scheme support or credit note—is not the legal test. Timing, contract terms, invoice linkage, dealer obligations, money flows and ITC treatment determine the result.
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The two Section 15(3) routes for excluding a discount from GST value
Section 15 of the CGST Act establishes when a discount can be left out of the value on which GST is calculated. The distinction is between a discount given before or at supply and one granted after supply.
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A discount given before or at the time goods or services are supplied is excluded from taxable value when it is duly recorded on the invoice. The invoice should show the price, discount and resulting taxable value clearly enough to connect the reduction with that supply. GST is then calculated on the net value shown on the invoice, subject to the other valuation rules in Section 15.
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Discount granted after supply
A post-supply discount is excluded only if every condition in Section 15(3)(b) is satisfied:
- The discount was established in an agreement entered into at or before the time of supply.
- The discount is specifically linked to the relevant original invoices.
- The recipient reverses the ITC attributable to the discount on the basis of a document issued by the supplier.
Failure of any one condition means the supplier should not reduce the taxable value merely because a rebate was paid or a credit note was issued. The statutory wording requires the ITC reversal: Section 15(3)(b) refers to “input tax credit as is attributable to the discount on the basis of document issued by the supplier has been reversed by the recipient of the supply.”
Invoice discount versus post-sale rebate
| Question | Invoice discount | Post-supply discount |
|---|---|---|
| When is it granted? | Before or at the time of supply | After the supply |
| Where is it documented? | On the original tax invoice | In the prior agreement, linked invoices and a supplier-issued document |
| Prior agreement required? | Not as a separate Section 15(3)(b) condition, although commercial documentation remains important | Yes. The discount must have been established at or before supply |
| Invoice linkage | The invoice itself records the reduction | The amount must be specifically linked to the relevant original invoices |
| Recipient ITC action | ITC is based on the tax invoice for the net value | Recipient must reverse ITC attributable to the discount |
| Can the supplier reduce taxable value? | Yes, when properly recorded on the invoice | Yes, only when all Section 15(3)(b) conditions are met |
Can a post-sale discount reduce GST?
It can, but only through the statutory route. A year-end rebate, quarterly volume incentive or secondary discount does not qualify automatically because it is calculated after invoices were issued. Start with the scheme agreement that existed before the supplies. It should explain how the discount is earned, the period or products covered, the calculation method and how individual invoices will be identified.
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Step 1: Check the agreement date
Keep the signed agreement, dealer appointment terms or scheme circular showing that the discount was established at or before the relevant supplies. A document created only after the sales period is over is evidence of a later commercial decision, not proof that the Section 15(3)(b) condition existed when the supplies were made.
Step 2: Link the amount to invoices
The supplier should map the discount to the original invoice numbers, dates and taxable amounts. A spreadsheet or system report that identifies each invoice can support the credit-note trail. A single unexplained year-end figure, with no invoice-level linkage, should not be described as a qualifying value reduction merely because the dealer reached a purchase target.
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Step 3: Issue the supplier document
For a qualifying post-supply discount, issue the document required by the GST rules and identify the invoices and discount amount. The document should allow the dealer to determine the ITC attributable to the reduction. Retain evidence of delivery and accounting entries on both sides.
Step 4: Obtain and record ITC reversal
The dealer or other recipient must reverse the ITC attributable to the discount. The reversal should be supported by the supplier’s document and the recipient’s GST records, returns and reconciliation. If the recipient keeps the full original ITC, the supplier cannot treat the discount as excluded from taxable value under Section 15(3)(b).
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What a commercial credit note does—and does not do
CBIC Circular 92/11/2019-GST, dated 7 March 2019, recognizes that a supplier may issue a financial or commercial credit note even when the conditions in Section 15(3)(b) are not satisfied. The circular states that “financial / commercial credit note(s) can be issued by the supplier even if the conditions mentioned in clause (b) of sub-section (3) of section 15 of the said Act are not satisfied.”
Such a note can record the amount the parties have agreed commercially. It may be settled by payment, set-off against future invoices or another contractual method. It does not, by itself, reduce the taxable value of the original supply, the output tax reported by the supplier or the recipient’s ITC. The supplier must account for GST on the original taxable value when the Section 15(3)(b) conditions are missing.
Two separate accounting questions
- Commercial settlement: What amount does the supplier owe or credit to the dealer under the business agreement?
- GST valuation: Does the adjustment satisfy Section 15(3) so that the original taxable value and tax can be reduced?
Confusing these questions is a common source of errors. A note can be valid for commercial settlement while having no effect on the GST value of the earlier supply.
Are dealer incentives consideration for a separate service?
The answer depends on what the dealer is required to do, not on the label “incentive.” If payment is simply a reduction in the dealer’s purchase cost with no additional obligation, it is analyzed as a discount under Section 15(3). If payment is conditional on advertising, a special sales drive, an exhibition, product placement or another identifiable activity, the arrangement may involve a separate supply by the dealer. That question requires a fact-specific analysis of the contract, deliverables, consideration and documentary evidence.
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Do not rely on the former CBIC interpretation that automatically treated certain activity-linked incentives as consideration for dealer services. CBIC Circular No. 105/24/2019-GST, dated 28 June 2019, discussed those situations but was withdrawn ab initio by Circular No. 112/31/2019-GST, dated 3 October 2019. Circular 112 expressly says it “hereby withdraws, ab-initio, Circular No. 105/24/2019-GST dated 28.06.2019.” The withdrawn circular is historical context, not operative CBIC guidance.
Questions to ask when a service may exist
- Does the dealer have a written obligation to perform a defined advertising or promotional activity?
- Must the dealer provide proof such as photographs, media invoices, event records or campaign reports?
- Is the payment calculated for the activity, rather than for purchase volume or a price reduction?
- Is there a separately identifiable service description, tax invoice and consideration?
- What does the current contract and applicable GST guidance say about that precise fact pattern?
Because Circular 105 was withdrawn, obtain current professional advice before treating an incentive as a taxable service or as a pure discount.
How volume and year-end rebates work
Businesses often set a target at the start of a quarter or financial year and calculate the rebate after the dealer’s purchases are known. Circular 92 describes staggered and periodic or year-end volume discounts that were agreed before or at supply and later passed through credit notes. They can be excluded from taxable value when the Section 15(3)(b) requirements are met, including invoice-specific linkage and the recipient’s ITC reversal.
The fact that the amount is based on purchase volume is not enough. If the scheme was not established before supply, or if the final amount cannot be allocated to the relevant invoices, treat the payment as a commercial adjustment unless a current legal analysis supports another treatment.
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Is GST payable on a dealer incentive? A decision checklist
- Identify the payment. Write down whether it is an invoice discount, retrospective rebate, target incentive, advertising allowance, price support or another payment.
- Read the operative documents. Review the dealer agreement, scheme letter, purchase terms, amendments and any annexures in force when the goods were supplied.
- Determine timing. Establish whether the amount was fixed or earned before or at supply, or decided only afterward.
- Test invoice linkage. Reconcile the calculation to original invoice numbers, dates and taxable values.
- Test ITC treatment. Confirm how the recipient will calculate and reverse attributable ITC and retain proof of that reversal.
- Classify the document. Decide whether the supplier document is being used for a Section 15(3)(b) value reduction or only for commercial settlement.
- Check for dealer obligations. If advertising, exhibitions or special campaigns are required, analyze a possible separate supply using current authority rather than Circular 105.
- Report consistently. Align invoices, credit notes, GST returns, ledger entries and dealer confirmations so the tax position matches the contract and money flow.
Records to keep for an audit
- The agreement or scheme terms dated on or before the supply period.
- Original tax invoices and an invoice-level rebate calculation.
- Supplier-issued credit notes or other documents identifying the linked invoices.
- Proof of payment, set-off or other commercial settlement.
- The dealer’s ITC-reversal workings and return or reconciliation evidence.
- Documents showing whether any advertising or promotional activity was required and performed.
- Internal approvals explaining why a note is a GST value reduction or only a commercial credit.
- Correspondence that resolves changes, cancellations or disputed targets.
Good records do not cure a failed statutory condition, but they make the actual arrangement visible and reduce the risk that a commercial label will be mistaken for a qualifying discount.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common mistakes and how to correct them
“We issued a credit note, so GST automatically falls.”
Correction: first determine whether Section 15(3)(b) is satisfied. If not, keep the note as a commercial adjustment and do not reduce the original taxable value on that basis.
“Every year-end rebate is a post-supply discount.”
Correction: verify that the rebate was established before or at supply and can be linked to the invoices. A calculation made only after the year closes does not prove those conditions.
“The dealer can retain the original ITC.”
Correction: attributable ITC reversal is an express condition for excluding a qualifying post-supply discount. Build the reversal into the settlement process.
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Correction: assess the actual dealer obligations and consideration. A label cannot create a separate supply, and the withdrawn Circular 105 cannot be treated as current authority.
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“A supplier-funded customer price cut has one automatic treatment.”
Correction: examine who sets the customer price, who bears the reduction, what the dealer promises to do and how the payment is documented. Circular 105 discussed supplier support for reduced customer prices but was withdrawn; obtain current, fact-specific advice.
Which authority should you read?
Section 15(3) of the CGST Act is the primary legal source. CBIC’s sectoral FAQ restates the two discount routes in plainer language and is useful as a cross-check, but the Act governs. Circular 92/11/2019-GST, issued on 7 March 2019, explains commercial credit notes, secondary discounts and volume schemes. Circular 105/24/2019-GST, issued on 28 June 2019, should be treated only as historical material because Circular 112/31/2019-GST withdrew it ab initio on 3 October 2019.
For a real transaction, review the contract, scheme terms, original invoices, supplier document, money flow, dealer obligations and ITC records together. The documents cited here do not determine every possible fact pattern, and a specific position may require current professional advice.
Frequently Asked Questions
Does a dealer have to reverse ITC when a post-sale rebate is used to reduce GST value?
Yes. For the supplier to exclude a post-supply discount under Section 15(3)(b), the recipient must reverse ITC attributable to that discount on the basis of a supplier-issued document.
Can a supplier issue a credit note for a year-end volume rebate?
Yes. The supplier can issue a commercial or financial credit note, but GST value is reduced only when the prior agreement, invoice linkage and ITC-reversal conditions in Section 15(3)(b) are all met.
Is every sales incentive a separate taxable service?
No. The result depends on the dealer’s actual obligations and the consideration. Activity-linked payments require current, fact-specific analysis; Circular 105/24/2019-GST, which discussed some such cases, was withdrawn ab initio.
The Bottom Line
A dealer rebate lowers GST value only when it fits Section 15(3): invoice-recorded discounts qualify when given before or at supply; post-supply discounts require a prior agreement, specific invoice linkage and reversal of attributable ITC. A commercial credit note can settle money without changing GST, and withdrawn Circular 105 should not be used as current guidance.
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