Start with the county assessor's website. How much detail you can pull depends on the state. In California it's straightforward: go to the county tax assessor's site, enter the address, and pull up the tax statement for that parcel. The statement shows the effective tax rate. Consumer sites like Redfin usually display the assessed value without the rate. For a quick estimate, divide the total annual taxes by the total assessed value to back into it. One caution when you do that math. California's base rate is about one percent, but flat-dollar add-ons like school bonds and water district fees don't scale with the home's value. On a long-held home with a low assessed value, those add-ons can make the percentage look very different from what you'd pay at today's price. Two habits worth keeping: - Check the specific parcel, since add-ons can differ street to street. The neighborhood average can mislead you. - Get the full tax number into your payment math before you fall in love with a house.