Credit Note vs Debit Note in GST – Complete Guide (2026)
Credit notes and debit notes are two of the most commonly used — and most commonly mishandled — documents in GST invoicing. Whether goods are returned, a price is corrected, or an extra amount needs to be charged, one of these two documents applies. Get the timing or the reporting wrong, and the result is usually a GSTR-1/GSTR-3B mismatch and, eventually, a notice.
This guide has been reviewed and updated for 2026, including a significant compliance change that took effect from the October 2025 tax period and now directly affects how every credit note’s tax benefit is finally settled.
When Is a Credit Note Issued?
- Goods are returned by the customer (sales return)
- The original invoice overcharged the customer
- A discount is given after the sale
- The goods or services supplied were found deficient
- The original invoice needs to be cancelled or corrected downward
When Is a Debit Note Issued?
- The original invoice undercharged the customer
- Additional goods or services were supplied after the original invoice
- There was an upward price revision
- An additional tax liability arose that wasn’t captured on the original invoice
Format Comparison
| Particulars | Credit Note | Debit Note |
|---|---|---|
| Effect on invoice value | Decrease | Increase |
| Issued by | Supplier | Supplier |
| GST impact | Reduces the supplier’s output tax liability | Increases the supplier’s output tax liability |
| Reporting in GSTR-1 | Table 9B (registered recipients); B2C notes are generally adjusted against Table 7 or the B2C Large table depending on the transaction | Table 9B (registered recipients) |
| Statutory time limit (Section 34) | Must be declared in a return by 30 November following the end of the financial year of the original supply, or the date of filing the annual return (GSTR-9) — whichever is earlier | No outer statutory time limit for issuing or reporting |
GSTR-1 Reporting Process
1Reference the original invoice number and date
2Enter the credit/debit note number and date
3Report the difference in taxable value and tax amount
4Submit the details in GSTR-1 Table 9B (for registered recipients)
5The document then flows through to the recipient’s Invoice Management System (IMS) dashboard and, once accepted, into their GSTR-2B
The October 2025 Change: Credit Notes Now Go Through the Invoice Management System (IMS)
This is the single biggest change affecting credit notes since GST began, and it was missing from most older guides written before late 2025 — so it is worth explaining clearly.
Section 38 of the CGST Act was amended (through a notification effective the October 2025 tax period), and a new Rule 67B was inserted to govern how a rejected credit note adjusts the supplier’s liability. Together, these changes mean that a supplier’s output tax reduction from a credit note is no longer automatic just because the credit note was correctly reported in GSTR-1. It now depends on the recipient’s action in the Invoice Management System (IMS) — the GST portal screen where every credit note, debit note, and invoice saved by a supplier appears for the recipient to Accept, Reject, or keep Pending.
- If the recipient accepts the credit note: it flows into their GSTR-2B, and they reduce their Input Tax Credit (ITC) accordingly. As of an October 2025 GSTN advisory, the recipient can also manually adjust the reversal amount so that only the ITC actually availed is reversed.
- If the recipient rejects the credit note: the supplier’s output tax liability, which had been reduced, is increased back in a subsequent return period — effectively reversing the benefit of the credit note for the supplier.
- If the recipient takes no action: specified documents, including credit notes, can be kept “Pending” in IMS for only one tax period before the recipient must accept or reject them.
The practical effect: a supplier can no longer assume a credit note’s tax benefit is secure the moment it is filed in GSTR-1. It is worth checking the IMS dashboard and following up with recipients who leave credit notes pending or reject them without explanation, since this now has a direct, mechanical effect on your own liability in a later return.
Common Mistakes
- Missing the credit note reporting deadline — once 30 November following the financial year (or the GSTR-9 filing date, if earlier) has passed, the claim cannot be adjusted through GST
- Assuming a correctly filed credit note automatically reduces your liability, without checking whether the recipient has accepted it in IMS (see above)
- Giving the wrong original invoice reference
- Adjusting credit notes and debit notes manually in the books without reporting them in GSTR-1
- Confusing a financial credit note (no GST impact, issued purely for accounting purposes) with a tax credit note
Financial Credit Note vs Tax Credit Note
Tax credit note: Issued under Section 34 of the CGST Act, reported in GSTR-1, and used to adjust the supplier’s GST liability (subject to the IMS acceptance discussed above).
Financial (commercial) credit note: Issued purely for accounting purposes — for example, a trade discount agreed after the deadline for a tax credit note has passed. It is not reported in the GST return, and it does not adjust the supplier’s output tax liability.
ITC Impact for the Recipient
When a supplier issues a credit note, the recipient’s corresponding Input Tax Credit generally needs to be reduced. Since the October 2025 IMS changes, this happens through the recipient’s own action — accepting the credit note in IMS is what triggers the ITC reversal in their GSTR-2B, rather than a reversal happening automatically or being left entirely to a manual GSTR-3B adjustment as under the earlier process.
E-Invoicing and Credit/Debit Notes
If your business is above the applicable e-invoicing turnover threshold — currently an aggregate annual turnover exceeding ₹5 crore in any financial year since 2017-18 — credit notes and debit notes issued to registered persons must also be registered on the Invoice Registration Portal (IRP) to generate an Invoice Reference Number (IRN), the same as an original tax invoice. Once your turnover crosses this threshold in any year, the e-invoicing requirement continues even if turnover later falls below it, so confirm your applicability status rather than assuming it based only on the current year’s numbers.
Credit Note Accounting Treatment
In the books of account, issuing a credit note reduces recorded sales/revenue. If payment had already been received against the original invoice, the excess is either refunded to the customer or adjusted against a future invoice, and this should be reflected consistently in both the accounting records and the GST return.
Credit Notes and the GSTR-9 Annual Return
After the financial year ends, all credit notes for that year are also reconciled in GSTR-9 (Annual Return). If a credit note was missed in GSTR-1 by mistake, the Annual Return filing date — or 30 November, whichever is earlier — is the last opportunity to correct it through the GST system.
ITC Impact of a Debit Note for the Recipient
When a supplier issues a debit note (increasing the invoice value), the recipient becomes entitled to claim additional ITC. This flows through the recipient’s IMS dashboard in the following period and, once accepted (or deemed accepted), appears in their GSTR-2B, from where it can be claimed in GSTR-3B.
Practical Example — Sales Return Scenario
Suppose an invoice was issued for ₹1,00,000 plus 18% GST (₹18,000), and the customer returns 30% of the goods. A credit note is issued for ₹30,000 plus ₹5,400 GST. The supplier’s output tax liability reduces by ₹5,400 once the credit note is correctly reported and accepted by the recipient in IMS, and the recipient correspondingly reverses ₹5,400 of previously claimed ITC.
Credit Notes in B2C Transactions
Credit notes can also be issued for B2C (business-to-consumer) transactions. Since the consumer is not GST-registered, there is no ITC reversal to track on their side — only the supplier’s taxable value and tax liability are adjusted. Reporting for B2C credit notes generally differs from the B2B process: smaller B2C supplies are typically adjusted net against outward supply values, while larger B2C transactions above the prescribed invoice-value threshold are reported separately, so check which category applies before filing.
Credit Note vs Sales Return — the Accounting Difference
Issuing a credit note is not, by itself, sufficient when goods are physically returned — stock records also need to reflect the goods coming back into inventory. Keep the “sales return” entry in your accounting/inventory records and the “credit note” entry in your GST records in sync, or your inventory count and your GST filings can end up mismatched.
Frequently Asked Questions
Q1. Is there a deadline for issuing a credit note?
There is no restriction on when a credit note can be physically issued, but for it to have GST effect (reduce your output tax), it must be declared in a return by 30 November following the financial year of the original supply, or the Annual Return filing date — whichever is earlier.
Q2. Is there a time limit for debit notes?
No outer statutory time limit applies to issuing or reporting a debit note — it can be issued whenever an undercharge is identified.
Q3. What does the recipient need to do after a credit note is issued?
The recipient needs to act on the credit note in the Invoice Management System (IMS) — accepting it triggers the corresponding ITC reversal in their GSTR-2B; rejecting it reverses the benefit back onto the supplier’s liability in a later period.
Q4. Can a credit note be issued for a partial amount?
Yes. If only part of the goods were returned, or a partial discount was agreed, a credit note can be issued for the proportionate value.
Q5. Does the recipient need to approve a debit note before it is issued?
No — a supplier can issue a debit note unilaterally. In practice, however, communicating with the recipient beforehand helps avoid later disputes.
Q6. Does a correctly filed credit note guarantee my GST benefit?
Not on its own, since the October 2025 changes. The benefit is only finalised once the recipient accepts the credit note in IMS (or the pending period lapses without rejection). Track your IMS dashboard rather than assuming the reporting step alone is sufficient.
Conclusion
Correct use of credit notes and debit notes, timely GSTR-1 reporting, and — since October 2025 — active monitoring of how recipients respond to your credit notes in IMS are now all part of staying GST-compliant. Missing the Section 34 deadline still permanently forfeits the tax adjustment; missing the IMS follow-up can now silently reverse a benefit you had already claimed. Build both checks into your monthly GST routine.