New York has very tough rules regarding new york source income. If your W-2 shows New York wages then you must file New York Non-resident income tax return. You should also file California Resident income tax return if you are a resident of California. You can take a credit of taxes paid to New York on your Califonia return.
You should contact a professional to clarify your tax situation.
If you need help, let me know. I work for a CPA firm and prepare taxes.
Last edited: 24-Jan-12 08:10 PM