This totally depends on how your municipality levies property taxes. In many parts of the Northeast US, for example, the county first sets its budget for the year, and then levies tax by dividing the budged among property owners in proportion to assessed property value. Therefore, if the county's budget hasn't changed, and if all of your neighbors' houses have increased in value by the same % as yours, then you'll pay the same tax as last year. Conversely, it's possible for your house to increase in value but to owe less tax if your neighbors' houses increased in value by more than yours.