Treatment of invoice in GSTR1 & R9

To address the situation where an invoice was included in GSTR-3B (and tax was paid) but not reported in GSTR-1, you should rectify the records to ensure consistency. Since the tax liability has already been discharged in GSTR-3B, you are not required to pay additional tax or interest for the invoice itself.

Steps to Resolve

1. Report the Invoice in GSTR-1:

   Since the invoice was omitted from your previous GSTR-1, you should report it in your current GSTR-1 filing.

   • Reporting: Enter the invoice details in the relevant table (e.g., B2B, B2C Large, etc.) in the GSTR-1 of the current month.

   • Tax Liability: Because the tax was already paid in the GSTR-3B for December 2020, you do not need to pay it again. Simply include the details so that the GSTR-1 and GSTR-3B records align for the authorities and the recipient can claim the Input Tax Credit (ITC).

2. Addressing the Cancellation:

   You mentioned the invoice was cancelled but no credit note was issued. Under GST law, if an invoice is cancelled after being reported in a return, you should generally issue a Credit Note to nullify the liability.

   • If you have already paid the tax for this invoice in your December 2020 GSTR-3B, and you now want to reflect the cancellation, you should issue a Credit Note.

   • Report this Credit Note in your GSTR-1 for the month in which it is issued. This will adjust your outward tax liability in your corresponding GSTR-3B.

Summary

• Report the invoice: If the invoice is still considered "valid" (not cancelled), report it in your current GSTR-1 so the recipient can view it in their GSTR-2B.

• Issue a Credit Note: If the invoice was effectively cancelled, do not simply ignore it. You should issue a formal Credit Note, which allows you to adjust the tax liability already paid in the December 2020 return.

• Reconciliation: Always maintain documentation for the original invoice, the proof of tax payment in the December 2020 GSTR-3B, and any subsequent adjustments (like a credit note) to explain the discrepancy if you receive a notice from the GST department.