GST PAYMENT AND FILING OF CONTRACTORS

Ayaz Ansari (39 Points)

12 March 2019  
Suppose i am a contractor and i have got a contract of 10,00,000 and when i started working i am getting payment in installment as my work goes to completion stage and final bill will be issued after completion. so my question is whether i have to file all the gst return NIL till the completion of contract or i have to file 3b on payment basis and at the time of completion final invoice will be shown in that periods gstr1??
Please explain me