@user17553787901 , sorry you are missing the point --- the employer DOES NOT ever subtract the standard / itemized deduction--- it depends on your filing status. The employer only withholds your federal and state taxes ( and for most employees the FICA taxes ).
When you file your return , next year, you include the deduction ( standard / itemized whichever is larger ) amount as I mentioned in my last post. In your case and assuming that you file as single, yes it is 15,000 or thereabouts. What the US-India tax treaty allows an Indian student to do is use the standard deduction -- other international students are limited to using itemized deduction.
Now are we on the same page ?
Is there more I can do for you ? Do you wish to PM me ( just NO PII -- Personally Identifiable Information)
pk
