Property ownership in Harris County involves an annual property tax cycle, and changes in property values can affect the amount shown on a property account. For homeowners and commercial property owners, monitoring yearly property values can be an important part of managing the property. Reviewing historical information can also provide context about how property values and reductions have changed over time. The Harris County Property Tax Trends resource gives property owners access to information that can help explain these changes and provide a broader view of Harris property tax values. Harris CAD trends can change from one year to another.