Question: how to do a gst return?
Answer: On this page. ... 
Enter your personal business information.
Enter your total sales and other revenues (line 101) ... 
Calculate your net tax (lines 103, 104, 105, 106, 107, 108, and 109) ... 
Enter other credits (lines 110, 111, 112, and 113 A) ... 
Enter other debits (lines 205, 405, and 113 B)