In GSTR – 3B, the tax implications on the credit notes, debit notes & purchases from unregistered dealers which are falling under RCM have to be reported and paid, in case of f the taxpayer has missed all these documents, they can upload the same in GSTR – 1 and GSTR – 2 and this will automatically get updated in the GSTR – 3 and the tax liability can be settled and be GST compliant.
india-gst.in 