Where to file your taxes for Form 1120-S ; A foreign country or U.S. possession. 1. First, register with the Ohio Secretary of State.Registration information as well as forms are available online(opens in a new window) or at (877) SOS-FILE. File Your Business Taxes Online. Get your employer ID number (EIN), find Form 941, prepare to file, make estimated payments, access your business tax account and more. The CCA – Division of Taxation office hours are Monday through Friday, am – pm. RITA makes it easy to file your municipal Taxes. For the quickest, easiest filing methods use FastFile and MyAccount. Get your refund status. A current address will ensure that you receive important mailings.