Why should i file itr?

Individuals having total income up to Rs.5,00,000 for FY 2010-11, after allowable deductions, consisting of salary from a single employer and interest income from deposits in a saving bank account up to Rs.10,000 are not required to file their income tax return. Such individuals must report their Permanent Account Number (PAN) and the entire income from bank interest to their employer, pay the entire tax by way of deduction of tax at source, and obtain a certificate of tax deduction in Form No.16. but Persons receiving salary from more than one employer, having income from sources other than salary and interest income from a savings bank account, or having refund claims shall not be covered under the scheme therefor 

not required to file the return