Choose the tax route before issuing the note
For a registered B2B supply governed by the amended provisions, a post-supply discount can reduce taxable value through a section 34 credit note where the recipient reverses the attributable input tax credit it has availed. Sections 153 and 154 of the Finance Act, 2026 commenced on 1 November 2026 under Notification 03/2026–Central Tax. The existing proviso to section 34(2), effective from 1 October 2025, prevents a supplier reduction where the registered recipient has availed attributable ITC and has not reversed it. In other cases, the proviso tests whether the incidence of tax was passed on. For transactions straddling commencement, assess the supply, discount, document and reporting dates before choosing the applicable text.
Read the applicable text: Gazette: Finance Act, 2026, sections 153 and 154 CBIC Notification 03/2026–Central Tax, Gazette copy CBIC statutory text: CGST Act section 34 CBIC Circular 251/08/2025.
Separate the legal change from the evidence trail
The amended section 15(3)(b) drops the former conditions of an agreement entered into at or before supply and specific linkage to invoices. It requires the supplier’s credit note and the recipient’s attributable reversal in accordance with section 34. If the recipient did not avail that ITC or has already reversed it, retain evidence of that fact and avoid a second reversal; reconcile the portal’s Invoice Management System (IMS) amount to the credit actually availed. Section 34(1) expressly accommodates this discount. Rule 53(1A) separately prescribes credit-note particulars including the corresponding invoice numbers and dates. Preserve the invoice allocation so the tax amount can be reproduced even where a discount is calculated across a period.
Reconcile amounts by recipient, invoice and tax head
Build the discount allocation from the commercial approval and the original tax basis. Identify each eligible recipient registration, distinguish taxable and exempt lines where relevant, and use the original rate and tax heads for the attributable amounts. Confirm that the reversal evidence corresponds to the same credit note, registration and tax heads. Keep an exception open when only part of the expected reversal is substantiated; do not assume that part of the supplier reduction is automatically permitted.
Use the earlier reporting cut-off
Section 34(2) requires declaration in the return for the month of issue and sets an outer limit of 30 November following the supply financial year or the date the relevant annual return is furnished, whichever comes first. The date of the discount approval does not start a fresh statutory clock. Check the actual filing evidence and any applicable relief before treating a credit note as reportable.
Keep commercial credits separate
A financial or commercial note may settle the receivable while the original GST stays intact. CBIC Circular 251/08/2025 explains that, on those facts, the recipient need not reverse ITC merely because of that note. Use a distinct posting code and do not upload it as a tax reduction. Where the arrangement pays for identifiable dealer services or involves another supply, analyse that separately rather than assuming every incentive is a discount.
Six worked illustrations
All facts and amounts are fictional. Calculations illustrate the stated assumptions, not a predetermined legal outcome.
Illustrative example 1: Single taxable rate
An interstate supply originally taxed at 18% later qualifies for a ₹20,000 discount. Attributable IGST is ₹3,600; the recipient that availed the entire original credit should match its reversal to ₹3,600.
Illustrative example 2: Two original rates
A ₹40,000 discount is supported by allocations of ₹10,000 to lines originally at 5% and ₹30,000 to lines originally at 18%. The respective tax effects are ₹500 and ₹5,400, or ₹5,900 in total.
Illustrative example 3: Incomplete recipient evidence
A discount of ₹50,000 on lines originally at 18% gives attributable tax of ₹9,000. Assume the recipient availed all ₹9,000 of attributable credit but evidence covers only ₹6,000 of reversal. Keep ₹3,000 as an unresolved difference and do not approve the claimed reduction on these facts.
Illustrative example 4: Commercial-only credit
A ₹15,000 commercial credit lowers a receivable of ₹100,000 to ₹85,000. Original GST stays unchanged; the tax adjustment and reversal attributable solely to that commercial note are each zero.
Illustrative example 5: Earlier annual return
A supply made on 15 December 2026 belongs to FY 2026–27. Assume the relevant annual return is furnished on 12 October 2027 and no applicable relief. The earlier limit is 12 October 2027, so a note first raised on 20 October 2027 is outside that reduction window.
Illustrative example 6: Separate tax heads
A ₹25,000 discount against intrastate lines originally charged at 9% CGST and 9% SGST gives ₹2,250 under each head and ₹4,500 in total. An IGST reversal for ₹4,500 would not reconcile to that split.
Ten-step verification table
| Step | Action | Evidence |
|---|---|---|
| 1 | Classify the event and applicable text | Supply date, discount approval and issue dates. |
| 2 | Choose tax or commercial treatment | Approved memo explaining the intended tax effect. |
| 3 | Confirm the recipient registration | Original invoice and recipient GSTIN. |
| 4 | Allocate the discount to the relevant supplies | Invoice-level support tied to the commercial amount. |
| 5 | Check original rates and tax heads | Original tax invoices and computation. |
| 6 | Complete the note particulars | Issued credit note checked against rule 53(1A). |
| 7 | Reconcile ITC reversal | Recipient-side evidence tied to the tax heads. |
| 8 | Calculate the earlier date | Supply FY and evidence of actual annual return furnishing. |
| 9 | Review return and ledger posting | Reporting extract, sales ledger and GST control accounts. |
| 10 | Close open differences before taking the reduction | Exception log, corrected documents and approval. |
Sixteen practitioner FAQs
1. Does a fresh discount agreement need to predate supply under the amended section?
The amended clause drops that statutory condition. Retain commercial approval and check the applicable regime.
2. Does the change eliminate invoice numbers from the note?
No. Check the independent particulars under rule 53(1A).
3. Who issues the tax credit note?
The supplier under section 34 where the statutory conditions apply.
4. Who reverses the attributable credit?
The recipient that availed the ITC.
5. Does a dealer acknowledgement itself prove reversal?
It helps identify the note. Reconcile to actual reversal evidence.
6. Can a commercial note lower the customer balance?
Yes, without reducing original GST when kept purely commercial.
7. Does that commercial note alone require ITC reversal?
The CBIC clarification says it does not on the stated facts.
8. Should the current rate be substituted for an earlier invoice rate?
Reconcile the note to the rate actually applicable to the original supply.
9. How do multiple rates affect a quarterly rebate?
Allocate the discount to the underlying rate populations before computing tax.
10. What if the recipient reports a different tax head?
Investigate and reconcile that difference before relying on it.
11. Which financial year sets the November deadline?
The financial year of the supply.
12. What if the annual return was furnished first?
The earlier furnishing date controls the outer limit.
13. Does a late commercial approval reset the GST limit?
No.
14. Can the new provision be used automatically for old supplies?
No. Assess the facts and temporal application before claiming reduction.
15. What if a dealer performs a separate promotional service?
Analyse the agreement and service consideration independently.
16. What is the release control?
Match note, original tax, recipient reversal and timely return declaration.
Official sources
Gazette: Finance Act, 2026, sections 153 and 154 CBIC Notification 03/2026–Central Tax, Gazette copy CBIC statutory text: CGST Act section 34 CBIC Circular 251/08/2025