Real property tax is calculated by multiplying the tax rate (per $100) by the property's assessed value (obtained from State Department of Assessments and Taxation (SDAT)). The tax rate is set each year by the County Council. The tax rate schedule is available on the web. To use the rate schedule, locate the tax rate on the tax bill, (for example, R42), then go to the schedule and match the number with the tax class line on the schedule. Read across the line to view which taxes apply to that property.