Taxes in Texas. Each state’s tax code is a multifaceted system with many moving parts, and Texas is no exception. The first step towards understanding Texas’s tax code is knowing the basics. How does Texas rank? Below, we have highlighted a number of tax rates, ranks, and measures detailing Texas’s income tax, business tax, sales tax, and property tax systems. Our Texas Property Tax Calculator can estimate your property taxes based on similar properties, and show you how your property tax burden compares to the average property tax on similar properties in Texas and across the entire United States.. To use the calculator, just enter your property's current market value (such as a current appraisal, or a recent purchase price). The state of Texas has some of the highest property tax rates in the country. In Harris County, the most populous county in the state, the average effective property tax rate is 2.09%. That’s nearly double the national average of 1.08%.