@raghavgupta93 , you should not have to do anything special. Your W-2 ( assuming it is the same employer ( as at OPT), would adjust the Box-3 and Box-5 of your W-2 to account for this . There should be a difference between Box-1 and Box-3 ( and generally Box-5 should be the same as Box-3 unless of course you are over the limit of Box -3 -- very well paid indeed ). If your employer has not taken care of this then you need a corrected W-2 from your employer (note that when you contribute to FICA the employer has to also contribute an equal amount ).
Namaste
