Income tax revision after due date

Ramesh patel (Business) (190 Points)

26 February 2020  
an assessee filed itr for financial years 2017-18 , n mistakenly quoted turnover 28,50,000 in itr instead of 1850000, this might lead to tax evasion charges when GSt is matched with itr , how can assessee revised return now since due date is over ?