Issue with Duplicate Tax Liability in GSTR-3B Due to Amendment in GSTR-1

[Ramanathan Seshan]

Dear Experts,

We mistakenly reported B2B invoices as B2C in their GSTR-1 for the Jan–Mar 2025 quarter. To correct this, the B2C entries were amended and correctly reported as B2B in the Apr–Jun 2025 GSTR-1.

However, this has resulted in the tax liability reflecting again in the Apr–Jun GSTR-3B, even though the tax was already paid in Jan–Mar. What’s the correct way to handle or adjust this duplication in GSTR-3B?

Regards,

S Ram

[Ganeshan Kalyani]

If B2C was reduced and B2B was increased /shown then the net effect is NIL. No liability should arise.

[Raam Srinivasan Swaminathan Kalpathi]

One cant amend a B2C invoice as B2B in GSTR-1.  The only option available would be to issue a credit note against those invoices which were erroneously shown as B2C and issue new B2B invoices.  You may also have to take the customer also into confidence.

[Shilpi Jain]

Ideally when you amend the B2C to reduce the liabiltiy and add the B2B liability, no additional liability should arise.

AI Summary

Correction of GSTR 1 classification: reclassify via credit notes and reissued invoices to avoid duplicate GSTR 3B liability.
Reclassification of supplies from B2C to B2B in successive GSTR 1 filings should not create a fresh tax demand where the aggregate tax position is unchanged; issuing a credit note against erroneously classified B2C invoices and reissuing B2B invoices, with recipient coordination, reconciles turnover and tax paid and prevents duplicate recognition of liability in GSTR 3B.