I have submitted my GSTR 1 but before filing I came to realize that some sales invoices is not included in return. Is it possible to change the data or what can I do to rectify the mistake ???
File in the next month GSTR1 , but interest applicable , after submission I don't think you can revise GSTR1 , but just confirm with Help Desk number on portal .
You can show the same in gstr 3B but then there will be missmatch between G1 and G3B for current month as well as next month. in your next month's return Gstr 1 value will be greater than sale shown in Gstr 3B which may lead to showcause notice/ Visit from tax authorities u/s.75 (12) (recovery of self assessed tax).
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