How to amend invoice

In case of wrongly raised invoice with more tax amount, you may change the actual invoice with correct figures if you haven't yet file gstr-1 & not disclosed the same in gstr-1. But if you have already filed the gstr-1 for the may month you may amend the invoice in gstr-1 for the month of June under B2BA tab. Further, you may file gstr-3b for the month of may with the actual correct figures.