I got the e-invoice wrong and 24 hours have passed

The IRN is generated, the customer has it, and the mistake is only visible now: a wrong address, a wrong PIN, a tax amount that should not have been there, or a GSTIN that belongs to somebody else. The portal will not let you cancel it, because the cancellation window closed 24 hours after generation. Here is what the e-invoice system's own FAQs and the CGST Act say about the position you are in, and the different corrections people confuse with each other.

The IRN is a one-way door

IRN (Invoice Reference Number) is the unique number the government's e-invoice portal (the IRP) gives each e-invoice.

The IRP's own cancellation FAQ is blunt about editing:

"The IRN, once generated cannot be modified or deleted. However, if IRN is generated with wrong information, it can be cancelled. Once cancelled, the same document (with same document number) can't be reported again for generation of IRN. The cancellation is required to be done within 24 hours from the time of generation."

So there are three facts here, and they compound. Nothing on the IRN can be edited. The single remedy the system offers is cancellation. And cancellation carries its own deadline: 24 hours from generation, not 24 hours from discovery.

The next FAQ entry states the remedy and its cost together:

"If there is a mistake, incorrect or wrong entry in the e-invoice, then it cannot be edited or corrected. Only option is to cancel that invoice/IRN and report a new document (with new number) and generate a fresh IRN."

Read that twice. The correction is a new document with a new number. It is not an amended version of the same invoice, and per the first FAQ the cancelled document number cannot be reported again for generation of an IRN. An error therefore costs you one number and one re-issue.

The gateway also refuses half-measures: "E-Invoice/IRN can't be partially cancelled. It has to be fully cancelled", and "The e-invoice mechanism enables invoices to be cancelled. This will have to be triggered through the IRP within 24 hours."

What 24 hours actually buys you

Inside the window, the fix is the one the FAQ describes: cancel the IRN, report a new document with a new number, and generate a fresh IRN against it.

Pull your own copy while you can, too. The IRP FAQ says: "Once the e-invoice system has validated and registered an IRN, it will be made available to the taxpayer for reference on e-invoice system for only 24 hours." That sentence is about how long the portal shows the invoice for reference. Keep your own copy of every e-invoice you generate in your accounting records rather than relying on the portal screen.

After 24 hours: work out which mistake you made

"Correct the e-invoice" hides several different problems. The first question is whether the supply itself changed, or whether only the reporting of it was wrong.

1. The supply itself changed: goods came back, the value was overstated, the service fell short. This is what credit notes are made for. Under section 34(1) of the CGST Act, where "the taxable value or tax charged in that tax invoice is found to exceed the taxable value or tax payable in respect of such supply, or where the goods supplied are returned by the recipient, or where goods or services or both supplied are found to be deficient", the supplier "may issue to the recipient one or more credit notes for supplies made in a financial year containing such particulars as may be prescribed." A credit note is a fresh document with its own number.

Two limits sit on it. First, section 34(2) says the credit note must be declared in the return for the month in which it is issued, within the time described in the next section. Second, the proviso to section 34(2) says no reduction in the supplier's output tax liability is permitted if (i) the input tax credit attributable to the credit note, if availed, has not been reversed by the recipient, where the recipient is a registered person; or (ii) the incidence of tax on the supply has been passed on to any other person, in other cases. A credit note is therefore not a unilateral way of cutting your own tax liability.

2. The tax is right, but a particular in the invoice details was wrong. Section 37(3) of the CGST Act speaks to errors in what you have already reported in your outward supply return: a registered person who has furnished details under section 37(1) "shall, upon discovery of any error or omission therein, rectify such error or omission in such manner as may be prescribed, and shall pay the tax and interest, if any, in case there is a short payment of tax on account of such error or omission, in the return to be furnished for such tax period." Note the words "in such manner as may be prescribed": the mechanics (which form, which table) sit in the rules and portal procedure, which this article does not describe. Check the current procedure on the GST portal or with your return preparer before acting.

The e-invoice is not the same thing as the section 37 return, and the FAQs above do not say that correcting one corrects the other. They say only that the IRN itself cannot be edited.

3. The invoice was raised on the wrong GSTIN. Section 34(1) lists excess value or tax, returned goods and deficient supply. A wrong recipient is not among the grounds listed. For a wrong recipient GSTIN, the provision on disk that deals with errors in reported outward supplies is section 37(3), above. We have not found any official FAQ in our files that prescribes a specific e-invoice step for a wrong recipient GSTIN after the 24-hour window, so we do not describe one. Take advice on the specific facts.

The deadlines that people miss

The GSTN FAQ says: "No, there is no time limit to prepare the credit notes or debit notes against the e-Invoice." That is true about preparing the document, and it is where the reading usually stops.

Section 34(2) fixes a different deadline, the one that actually bites:

"Any registered person who issues a credit note in relation to a supply of goods or services or both shall declare the details of such credit note in the return for the month during which such credit note has been issued but not later than the thirtieth day of November following the end of the financial year in which such supply was made, or the date of furnishing of the relevant annual return, whichever is earlier, and the tax liability shall be adjusted in such manner as may be prescribed."

You may prepare the note whenever, per the FAQ. You must declare it in the return for the month of issue, and no later than 30 November following the end of the financial year of the original supply, or the date of furnishing of the annual return if that comes first.

Rectification under section 37(3) has a similar outer limit. Its proviso says no rectification of error or omission in the details furnished under section 37(1) "shall be allowed after the thirtieth day of November following the end of the financial year to which such details pertain, or furnishing of the relevant annual return, whichever is earlier."

What not to do

Do not re-issue the invoice with the same number. The FAQ is explicit that a cancelled document's number cannot be reported again for generation of an IRN.

Do not treat a credit note as a catch-all. Its grounds are value or tax in excess, returned goods and deficiency (s.34(1)), and the proviso to s.34(2) conditions any reduction of output tax liability.

Do not wait for a month-end clean-up. The 24-hour cancellation window is fixed by the IRP FAQ and is counted from generation.

Do not assume the 30 November date moves. Both section 34(2) and the proviso to section 37(3) fix it by reference to the end of the financial year of the supply, or the annual return, whichever is earlier.

The short version

FAQ

The error is a wrong PIN code in the address. Can I cancel the IRN now? No. Cancellation is available within 24 hours of generation, per the IRP FAQ.

Can I amend the invoice instead of cancelling it? The IRN "cannot be modified or deleted"; the only correction the e-invoice system itself offers is cancellation within the window.

If I cancel, can I re-use the invoice number? No. "Once cancelled, the same document (with same document number) can't be reported again for generation of IRN." Generate the replacement with a new number.

Is there no time limit at all on credit notes? There is none for preparing them. Section 34(2) still requires the credit note to be declared in the return for the month of issue, and not later than 30 November following the end of the financial year of the supply, or the date of furnishing of the annual return, whichever is earlier.

Where is my copy of the e-invoice if the portal only shows it for 24 hours? The FAQ says the system makes it available for reference for only 24 hours, so keep your own copy in your books at the time of generation.

What to do now

• Check the time since the IRN was generated. If it is under 24 hours, cancel and re-issue with a new number (IRP FAQ).
• If it is over 24 hours, decide which of the three cases above you are in, and note the date by which the correction must be declared: the return for the month of issue, and no later than 30 November after the end of the financial year of the supply, or the annual return date if earlier (s.34(2); s.37(3) proviso). For a supply made in FY 2025-26 that is 30 November 2026, unless the annual return is filed first.
• Miss that date and the Act does not allow the credit note to be declared or the rectification to be made (s.34(2); proviso to s.37(3)). Your output tax stays as reported.

Have a CA review your facts before you file a credit note or a rectification. Which case you are in is a judgment on your invoice, not a template.

IRP/GSTN FAQ text and CGST Act sections 34 and 37 quoted from the official files on our record. General information, not advice on a particular invoice.

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See Also

• I filed GSTR-1 with the wrong GSTIN — can the invoice still be fixed?
• The buyer rejected the goods at the gate — how do they come back?
• The squad stopped my truck and detained the goods — what do I do with the order in my hand?