Pending bills of 17-18 in gst return

I think GSTR 1 for year 2017-18  is still  open for  amendments up to 31/3/2019 please confirm if  yes  then  you can add  your sales  Invoices in  GSTR 1, and tell  your supplier  to add  Invoices in GSTR 1   which is purchase  for you .  

Dear Avadhesh,

For Sales bill, you could upload the same in form GSTR 1 on or before due date of GSTR 1 for Mar'19 and make payment through form DRC-03.

For Purchase bill, avail eligible ITC on or before due date for filing GSTR 3B for Mar'19 provided the same to be reflected in your GSTR 2A in terms of Order no. 02/2018 - Central Tax.