Interest on late payment

Nitesh Jhawar (MUMBAI) (67 Points)

25 August 2014  
an assessee has filed return before due date in assessment year 2013-14 and show tax liability of rs. 3000. he didn't paid tax till now and also didn't sent ITRV till now. he want to pay tax now. Is he liable to pay any interest, if yes under which section and what will be rate of interest and further consequences.please give your suggesssion as soon as possible.