Due date for August 2020 is 20/09/2020 bt it can be filled till 30/09/2020 with interest and penalty for those companies having turnover less than 5 cr
If your turnover is more than 5 crores then due date was 20th September 2020. If turnover is less than 5 crores then the due date was 22nd and 24th September depending upon the state