Post-Supply Discounts under GST: Current Legal Position, Budget 2026 Proposals and Compliance Considerations
1. Introduction
Valuation under the Goods and Services Tax regime continues to be one of the most debated areas of indirect tax compliance. A particularly contentious issue has been the treatment of post-supply (post-sale) discounts – especially with respect to their exclusion from the value of taxable supply and the corresponding ITC implications.
While the GST law provides certain conditions for deduction of post-supply discounts from taxable value, practical difficulties have persisted. The Union Budget 2026 proposed changes to this framework; however, these amendments are proposals in the Finance Bill 2026 and have not yet been brought into force through notification.
This article outlines the current legal position, the Budget proposals, and practical compliance considerations.
2. Statutory Framework – Section 15(3) of the CGST Act
Under Section 15(1) of the Central Goods & Services Tax Act, 2017 (“CGST Act”), the value of supply is generally the transaction value – the price actually paid or payable. Section 15(3) carves out certain discounts from the value of supply.
Specifically, Section 15(3)(b) provides that post-supply discounts may be excluded from value only if:
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Such discount is established in terms of an agreement entered into at or before the time of supply,
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It is specifically linked to relevant tax invoices, and
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The recipient reverses the ITC attributable to such discount.
In practice, this framework has created challenges when discounts are commercial in nature and determined after the invoice without a formal prior agreement.
3. Practical Difficulties under the Current Law
Under the existing text of Section 15(3)(b):
- A written agreement before or at the time of supply is required for discount deduction even if the discount arises later;
- Linking each discount to specific tax invoices is operationally onerous;
- ITC reversal by the recipient must be documented and verifiable.
These requirements have often resulted in compliance hurdles and disputes, particularly in industries where discount structures are dynamic, performance-based, or volume-linked rather than pre-contracted.
4. Budget 2026 Proposals – Proposed Amendments
The Union Budget 2026 proposed amendments to valuation and credit note provisions in the CGST Act with a view to simplify the treatment of post-supply discounts. The key proposals are:
A. Amendment to Section 15(3)(b)
The Budget 2026 proposals recommend amending Section 15(3)(b) to:
- Omit the requirement for a pre-existing agreement and specific invoice linkage;
- Permit reduction of taxable value where a credit note has been issued for post-supply discount and the recipient reverses the corresponding ITC under Section 34.
B. Amendment to Section 34
Section 34 of the CGST Act, which governs issuance of credit notes, is proposed to be amended to expressly include issuance of credit notes for post-supply discounts referred to in Section 15(3)(b).
C. Effective Date
These amendments are proposed to take effect from a date to be notified by the Government. They are part of the Finance Bill, 2026 and become law only after enactment and subsequent notification.
5. Current Compliance Position (Until Notification)
Until the proposed amendments are formally notified:
- The existing statutory text of Section 15(3)(b) continues to apply;
- Post-supply discounts will be excluded from taxable value only if all conditions of the current law are satisfied;
- Credit notes must satisfy Section 34 requirements to adjust tax liability.
Taxpayers should therefore continue to default to the present provisions while monitoring notification of the Budget proposals.
6. Classification of Credit Notes
Under the current law, it is important to distinguish between:
(A) Tax Credit Notes
These reduce the original output tax liability and require corresponding ITC reversal by the recipient.
(B) Financial / Commercial Credit Notes
These adjust commercial value without altering the output tax liability; in such cases, ITC reversal may not be necessary as tax charged remains unchanged.
Correct classification and reporting is essential to avoid disputes during audit or scrutiny.
7. ITC Reversal – Compliance Under Current Law
Where taxable value is reduced by issuance of a credit note under Section 34:
- Recipients must reverse the attributable ITC.
- Mismatch between supplier return reporting and recipient’s ITC reversal may trigger system scrutiny under automated return matching mechanisms.
Adherence to timelines and reconciliation is therefore important.
8. Implications of Proposed Amendments
If the proposed provisions are notified:
- The requirement for pre-existing agreements would be removed;
- Commercial post-supply discounts could be deducted more flexibly if documented through credit notes and supported by ITC reversal;
- Operational ease would improve for industries with dynamic discount structures.
However, until notification, taxpayers must continue compliance under the existing statutory provisions.
9. Practical Compliance Guide
To manage post-supply discount transactions effectively:
1. Document discount policies and scheme terms clearly, even if not legally mandated yet;
2. Ensure issuance of credit notes with prescribed particulars;
3. Maintain clear linkage between credit notes, returns, and ITC reversal;
4. Reconcile GSTR-1, GSTR-3B, and books of account;
5. Monitor official notifications for effective date of proposed amendments.
10. Conclusion
The treatment of post-supply discounts under GST remains governed by the current statutory language of Section 15(3)(b) and Section 34 of the CGST Act until such time that the Budget 2026 proposals are notified and brought into force.
The proposed amendments reflect an effort to align GST valuation provisions with commercial practices and reduce litigation. Until notification, taxpayers should carefully comply with existing requirements and prepare for transition to the updated legal framework once it becomes effective.
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