Data Analyst
158 Points
Joined April 2017
If buyers add those invoices in their GSTR-2, then you will have to accept and your tax liability will increase.
GSTR-1 allows you to amend B2C tax liability of earliar months, but GST portal is not ready with this feature. GSTN has not published any timeline for amend feature yet.
I recommend you to use OCTA-GST which has inbuilt GST rule engine and reports invoices in approriate GSTR-1 sections to avoid such human mistakes.
Octa GST - Free offline desktop application to file your GST returns
https://octabits.in