Oregon Corporate Income & Excise Tax History
C-Corporation net income attributable to Oregon is taxed under the corporate excise tax. The tax rate is 6.6%. The corporate excise tax is the second largest tax source for the state General Fund. The corporate tax revenue is projected to provide 4.5% of General Fund revenues in the 2007-09 biennium. Oregon uses federal taxable income, with some modifications, as its tax base. Corporations pay taxes only on income attributable to Oregon.