Ohio income tax rate and tax brackets shown in the table below are based on income earned between January 1, 2019 through December 31, 2019. Outlook for the 2020 Ohio income tax rate is to remain unchanged with income tax brackets increasing due to an annual inflation adjustment. Taxes in Ohio. Each state’s tax code is a multifaceted system with many moving parts, and Ohio is no exception. The first step towards understanding Ohio’s tax code is knowing the basics. How does Ohio rank? Below, we have highlighted a number of tax rates, ranks, and measures detailing Ohio’s income tax, business tax, sales tax, and property tax systems. The Ohio income tax has seven tax brackets, with a maximum marginal income tax of 5.00% as of 2020. Detailed Ohio state income tax rates and brackets are available on this page.