In Oregon, property taxes help support police, fire protection, education and other services provided by local taxing districts, such as cities, counties and schools. The amount of property tax you pay is based on two things: 1) the assessed value of your property, and 2) the amount of taxes that each taxing district is authorized to raise. The Oregon constitution places limits on both of these factors. It establishes a maximum assessed value and limits the increases of this value. The constitution also places a limit on operating tax rates for most of the taxing districts in the state.
Property is taxed on its assessed value. A property's assessed value is the lower of its real market value or its maximum assessed value. Each year, the county assessor determines the property's real market value and calculates its maximum assessed value. You are taxed on the lesser of the two, which is called the assessed value