Conversion of old B2Cs invoices to B2B

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I am a regular GST filer. I issued 16 B2Cs invoices to my client from April 25 to June 25. Though my client has GST registration but he never informed me till date. Now he is demanding to convert all invoices into B2B. Is it possible under GST laws , if yes how. Please explain me the whole procedure. I will be very thankful.
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Under GST laws, once an invoice is issued, it cannot be changed or converted from one type to another (e.g. from B2C to B2B) without proper documentation and justification. 

The GST PORTAL ALLOWS for the filing of GSTR-1, which includes details of all outward supplies, including B2B and B2C transactions.

Procedure to Address the issue:

1.Check if the client's GST registration was active during the period when the B2C invoices were issued. If it was, the client should have provided their GSTIN (GST Identification Number) at the time of the transaction.

2. Issuance of Credit Notes and New Invoices: To convert the B2C invoices to B2B invoices, the supplier needs to issue credit notes for the original B2C invoices and then issue new invoices with the correct GSTIN of the client. This process effectively cancels the original invoices and replaces them with new B2B invoices. 

3. Filing of GSTR-1: The supplier should file an updated GSTR-1for relevant tax period, reporting the credit notes and new B2B invoices. This will adjust the outward supplies reported earlier. 

4. Rectification in GST Returns: Ensure that the rectification is reflected in the subsequent GST returns (GSTR-3B and GSTR-1) to avoid any discrepancies or penalties.


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