Excess deduction wrongly declared

Kamal (Student) (65 Points)

26 July 2019  
Unfortunately, the client(Salaried employee) has declared a excess amount of Rs. 25,000 under section 80C and the same has reflected in the form 16 part B.

Now while filing income tax and filling up ITR -1, can we reduce the deductions and file the same?

would there be any future consequences because of this ?