Where to file your taxes for Form 1120-S ; A foreign country or U.S. possession. Corporations file Schedule M-3 (Form 1120) to answer questions about their financial statements and reconcile financial statement net income (loss)Get your employer ID number (EIN), find Form 941, prepare to file, make estimated payments, access your business tax account and more. Businesses must file federal and state income tax returns. We touch on some important issues for the most common business structures. An individual or entity (Form W-9 requester) who is required to file an information return with the IRS must obtain your correct taxpayer. You must register to file the Airline Flight Property if you own, lease, loan, or make available flight property to an airline company operating in Minnesota . This form was developed to comply with Internal Revenue Service (IRS) regulations and Minnesota statute and to assist Hennepin County in.