How do you register a business in ohio? Starting a Business. 1. First, register with the Ohio Secretary of State. Registration information as well as forms are available online or at (877) SOS-FILE. 2. Contact the Internal Revenue Service (IRS) to obtain an Employer Identification Number (EIN). Additional information and an online application are available at www.irs.gov - seach "EIN.".What is the fax number for the ohio department of taxation? The phone number for the Department of Taxation is: 419.394.3303 Option #2. The fax number for the Department of Taxation is: 419.394.3304. The Covington tax rate is 1.5%.Does ohio have state income tax? While Ohio does not have a corporate income tax, the Ohio gross receipts tax serves a similar purpose and applies to most businesses. Three other states have a similar setup instead of a corporate income tax, including Texas, Michigan, and Washington.Are services taxable in ohio? TAXABLE Sales of janitorial services are subject to sales tax in Ohio. In the state of Ohio, transportation of any persons by aircraft or motor vehicle, with the exception of transportation by ambulance or transit bus, is not considered to be exempt.