A credit note in GSTR-1 is reported in the Credit/Debit Notes (Registered) table if it relates to a B2B invoice, or the Credit/Debit Notes (Unregistered) table if it relates to a B2C large or export invoice. You report the note in the return period in which you issue it, not the period of the original invoice, and it reduces your outward tax liability by the note's taxable value and tax amount. A debit note follows the same tables but increases liability instead of reducing it.
Sellers using marketplaces, running sales returns, or issuing post-sale discounts deal with credit and debit notes every month. Getting the reporting table, the original invoice reference, and the tax rate wrong is one of the more common reasons a GSTR-1 return needs correction later. This guide covers where each note goes, how it changes your liability, and how OneBooks GST handles this inside GSTR-1 preparation.
What Is a Credit Note and a Debit Note Under GST?
A credit note is a document a supplier issues to reduce the value or tax charged on an earlier tax invoice, while a debit note is issued to increase it. A credit note is typically raised when goods are returned, a service is found deficient, a post-sale discount is agreed, or the original invoice overstated the taxable value or tax rate. A debit note is raised when the original invoice understated the value or tax payable, for example when a rate was quoted incorrectly and needs to be revised upward.
Both documents must reference the original invoice number and date. Without that reference, the note cannot be matched to the original supply, and GSTR-1 validation on the GST portal will flag it.
When Do You Need to Report a Note in GSTR-1?
You need to report a credit or debit note in GSTR-1 whenever any of the following happens after a tax invoice has already been reported in an earlier return:
- The buyer returns goods, fully or partially.
- You agree to a post-sale discount that was not known or fixed at the time of the original invoice.
- A service is found deficient and part of the value is refunded.
- The tax rate or taxable value on the original invoice was incorrect and needs correction.
- An e-commerce order is cancelled or partially rejected after the original invoice was already filed.
The note is reported in the GSTR-1 of the period in which you issue it, even if the original invoice belongs to an earlier tax period.
Where Do Credit and Debit Notes Go in GSTR-1?
GSTR-1 splits credit and debit notes by whether the original recipient was registered. The table below summarises where each type is reported.
| GSTR-1 Table | Applies To | What It Captures |
|---|---|---|
| Credit/Debit Notes (Registered) - CDNR | Notes issued against B2B invoices to GST-registered buyers | Note number, note date, original invoice number and date, taxable value, tax amount, place of supply |
| Credit/Debit Notes (Unregistered) - CDNUR | Notes issued against B2C large invoices or export invoices to unregistered buyers | Same fields as CDNR, without a buyer GSTIN |
| B2C small supplies | Notes against small-value B2C invoices | Netted into the state-wise B2C summary rather than listed as a separate note |
How Do You Fill the Credit or Debit Note Details Table?
Each note entry on the GST portal, and in any GSTR-1 preparation tool, asks for a consistent set of fields. Missing or mismatched fields here are a frequent cause of validation warnings.
| Field | Why It Matters |
|---|---|
| Note type | Determines whether the entry reduces (credit) or increases (debit) your liability |
| Note number and date | Uniquely identifies the document; note numbers should follow your own numbering series |
| Original invoice number and date | Links the note to the supply it corrects; a mismatch here is a common validation error |
| Taxable value and tax rate | The tax rate should normally match the original invoice unless the note is correcting the rate itself |
| Place of supply | Should stay consistent with the original invoice in most cases |
| Reason for the note | Sales return, deficiency in service, correction in value, or other, as selected on the portal |
How Does a Credit Note Adjust Your Tax Liability?
A credit note reduces the output tax liability you report for the period in which it is issued. For example, if an original invoice carried a taxable value of ₹50,000 and 18% GST of ₹9,000, and the buyer returns goods worth ₹10,000, the credit note is reported with a taxable value of ₹10,000 and tax of ₹1,800. That ₹1,800 is subtracted from your total output liability for the month, alongside your regular sales, rather than being adjusted against the original invoice directly.
A debit note works the same way in reverse: its taxable value and tax amount are added to your output liability for the period in which the debit note is issued.
Can a Credit Note Cover Multiple Invoices?
Consolidated credit or debit notes covering more than one invoice issued to the same recipient are permitted under GST, which is useful for sellers issuing frequent small adjustments to the same regular buyer. The exact conditions and any limits on this have been refined over time, so if you plan to issue a single note against multiple invoices, verify the current rule on the official GST portal at www.gst.gov.in before relying on it.
What Are Common Mistakes When Reporting Notes?
- Wrong original invoice reference - the note is linked to an invoice number that does not match what was actually filed.
- Note reported in the wrong table - a B2B note entered under CDNUR, or vice versa.
- Tax rate mismatch - the note's tax rate differs from the original invoice without a valid reason.
- Reporting in the wrong period - trying to adjust the original invoice's period instead of the period the note was actually issued in.
- Books and GSTR-1 disagreeing - the credit note recorded in accounting books does not match the value filed in GSTR-1, which surfaces later during GSTR-1 to books reconciliation.
How Does OneBooks GST Handle Credit and Debit Notes in GSTR-1?
OneBooks GST is a GST and accounting platform for Indian businesses that prepares GSTR-1 covering B2B, B2C, credit and debit notes, HSN summary, and document summary, alongside validation warnings before you export the return. When marketplace sales data is imported from Amazon, Flipkart, Meesho, Myntra, AJIO, or JioMart, order returns and cancellations are reflected as credit note lines within the GSTR-1 preparation workspace, so you are not manually re-typing note details from a separate returns report.
Before filing, OneBooks GST's validation warnings flag entries such as a note referencing an invoice number that was not found, or a taxable value that looks inconsistent with the original invoice, which reduces the chance of a JSON error at upload. The GSTR-1 automation workspace also lets you review credit and debit note entries alongside your regular B2B and B2C tables before exporting the GSTR-1 JSON, CSV, Excel, Tally XML, Miracle, or Profit NX file. If you are also filling the GSTR-1 HSN summary for the same period, note adjustments should be reflected there too since they affect the HSN-wise value totals. See OneBooks GST plans for details on what is included.
Frequently Asked Questions
Do I report a credit note in the month I issue it or the month of the original invoice?
You report a credit or debit note in the GSTR-1 of the period in which you actually issue the note, regardless of which period the original invoice belonged to. The note is not backdated into the original invoice's return.
What is the difference between CDNR and CDNUR in GSTR-1?
CDNR covers credit and debit notes issued against B2B invoices to GST-registered buyers, while CDNUR covers notes issued against B2C large invoices or exports to unregistered buyers. Both require the original invoice number and date.
Does a credit note automatically reduce my GST liability?
Yes, a correctly reported credit note reduces your total output tax liability for the period by its taxable value and tax amount, netted against your regular outward supplies in that return.
Can I amend a credit note after filing GSTR-1?
Yes, a credit or debit note can generally be amended in a later GSTR-1 the same way an invoice is amended. See our guide on how to amend GSTR-1 after filing for the process.
Is there a time limit for issuing a credit note under GST?
GST law sets an outer time limit for issuing and reporting a credit note relative to the financial year of the original supply. This limit can change, so verify the current time limit on the official GST portal at www.gst.gov.in before issuing a note close to that boundary.
