You need to file a return both federally and generally speaking, each state you earned income. You should gather your income and expenses documents and speak with an attorney and/or an accountant to assist you in properly filing the necessary forms.
Louis T. Wierenga Assisting in mitigating your business and tax risks. www.LTWLAW.com E Ltw@LtwLaw.com Twitter @LTWLAW The information provided is for general purposes only and should not be construed to be formal legal advice nor the formation of a lawyer/client relationship.
If you are not a U.S. citizen and are planning to leave the country, you should determine if you are required to apply for a tax clearance certificate. This would require you to be in compliance with your tax obligations. See: http://www.irs.gov/Businesses/Departing-Aliens-and-the-Sailing-Permit