Real Market Value (RMV) is typically the price your property would sell for in a transaction between a willing buyer and a willing seller on January 1, the assessment date for the tax year. To estimate the initial RMV for your property, your county assessor appraises your property using a physical inspection and a comparison of market data from similar properties. For ensuing tax years, your county assessor may study trends of similar properties to update the RMV for your property.