This discussion clarifies the mandatory filing requirements for GSTR-9 and GSTR-9C returns for FY 2017-18 and FY 2018-19. Generally, both returns are mandatory for taxpayers with an aggregate turnover exceeding Rs 2 Crores per PAN. However, the reconciliation statement in GSTR-9C is not mandatory for businesses with a turnover up to Rs 5 Crores, effective from FY 2018-19 as per notification 16/2020 CT.