I don't know a lot more about this, but there is a double taxation avoidance agreement between India and other foreign countries. This is in place so you don't have to pay double taxes in 2 countries.
Ideally a certain amount of your salary will be withheld by US (withholding tax i think) as their tax. The remaining salary will be credited into your account as it is without any more deductions. Now, when you file ITR in India, you can show the withholding tax as your tax paid (Don't know the specifics) and be except from any other additional taxes.