Income tax 234 a

GEORGE JOSEPH ( Practising CA) (100 Points)

01 August 2016  

due date of filing return for AY 2016-17 extended to Aug 5,2016.When paid balance tax by my client today 01,aug 2016, and filed return ITR 1  by"quick file" option, interest under 234 A coming.why interest before 5 , aug?