Originally Posted by Wnhough

It depends; aslong asyou are a nonresident alien individual engaged or considered to be engaged in a trade or business in the US during the year. You must file even if your income did not come from a trade or business conducted in the US;you have no income from U.S. sources, or your income is exempt from income tax, then you must file a return, I guess both fed and CA returns.As mentioned previously, you must also file an income tax return if you want to claim a refund of overwithheld or overpaid tax, or claim the benefit of any deductions or credits. For example, if you have no U.S. business activities but have income from real property that you choose to treat as effectively connected income, you must timely file a true and accurate return to take any allowable deductions against that income.i guess you cancontact a CPA/IRAEA in your local area for more professional help in detail.