What is substituted Filing of income tax returns (ITR)?

6) What is substituted Filing of income tax returns (ITR)?

Substituted Filing of ITR is the manner by which declaration of income of individuals receiving purely compensation income the taxes of which have been withheld correctly by their employers. Instead of the filing of Individual Income Tax Return (BIR Form 1700), the employer’s annual information return (BIR Form No. 1604-CF) duly stamped received by the BIR may be considered as the “substitute” Income Tax Return (ITR) of the employee, inasmuch as the information provided therein are exactly the same information required to be provided in his income tax return (BIR Form No. 1700). However, said employees may still file ITR at his/her option.

Source : http://www.bir.gov.ph/index.php/tax-information/withholding-tax.html#wt0013