The exact property tax levied depends on the county in Oregon the property is located in. Clackamas County collects the highest property tax in Oregon, levying an average of $2,814.00 (0.85% of median home value) yearly in property taxes, while Gilliam County has the lowest property tax in the state, collecting an average tax of $956.00 (0.96% Taxes in Oregon. Each state’s tax code is a multifaceted system with many moving parts, and Oregon is no exception. The first step towards understanding Oregon’s tax code is knowing the basics. How does Oregon rank? Below, we have highlighted a number of tax rates, ranks, and measures detailing Oregon’s income tax, business tax, sales tax, and property tax systems. 4. Check the 2020 Oregon state tax rate and the rules to calculate state income tax 5. Calculate your state income tax step by step 6. If you want to simplify payroll tax calculations, you can download ezPaycheck payroll software, which can calculate federal tax, state tax, Medicare tax, Social Security Tax and other taxes for you automatically. You can try it free for 30 days, with no obligation and no credt card needed.