It is usually calculated by applying the county's tax rate to the assessed value. The group hopes that one day these AI creations will become your friend, lover, companion and even your caregiver. In general, the lower tax benefit carries on to surviving spouses when their partners pass away. Showing 1- 7 of 7. Under state law, a property's taxable value is first set to market value when there is a new owner - in other words, when you buy your home.