For taxable years beginning in 2018:

Ohio Taxable Income Tax Calculation $0 - $10,850 0.000% $10,851 - $16,300 $80.56 +1.980% of excess over $10,851 $16,300 - $21,750 $188.47 + 2.476% of excess over $16,300 $21,750 - $43,450 $323.41 + 2.969% of excess over $21,750 $43,450 - $86,900 $967.68 + 3.465% of excess over $43,450 $86,900 - $108,700 $2,473.22 + 3.960% of excess over $86,900 $108,700 - $217,400 $3,336.50 + 4.597% of excess over $108,700 more than $217,400 $8,333.44 + 4.997% of excess of $217,400