@kiransaravi ,
(a) having lived in the USA for a long time ( and depending on your visa ) may require you get an exit clearance from the IRS. Please tell me more about the 10 years -- when did you enter the country and with which visa; were there any status adjustments, are you married and if so to whom ( US citizen/ GreenCard or to an NRA ) ?
(b) generally if you are a resident for tax purposes ( having passed the Substantial Presence Test -- SPT ), you are taxed on your world income by the US. Else you are taxed ONLY on US sourced income. In no case would your liability be zero i.e. all your withholdings be returned. AS a student however, you may get any FICA withholding back ( if your country has a totalization agreement with the USA )------which country are you from ?
( c) do you own any assets here in the USA -- stocks/ bonds/ savings account / house etc. etc. ?
(d) also note that if you leave the country before a full calendar year, you cannot use standard deduction and must use itemized deduction.
I will circle back once I hear from you -- yes ? If your situation is too specific and/or you do not want to share the answers on this public board, you can PM me .
pk
