How to Read Zillow Property Tax History and What It Tells You
Patrick Bushe
March 17, 2025 · 5 min read
Most Zillow listings include a Public tax history table near the bottom, taken from county records. It shows what the current owner paid, which is useful, but often not what you'd pay after buying. Here's how to read it.
What the table shows
- Year: the tax year.
- Property taxes: the total tax billed that year.
- Tax assessment: the value the county assessor put on the property for tax purposes. The county's own records often split it into land and improvements (the house).
- Change: how much the tax or assessment rose or fell from the year before.
Assessed value isn't market value
The assessed value is what the county uses to calculate tax, and in many places it's well below what the home would sell for. Some states assess at a fraction of market value; others limit how fast assessments can rise. Don't read a low assessment as a sign that the home is overpriced. Compare the asking price with recent sales instead, starting with price per square foot against similar homes nearby.
Why your taxes may be higher than the seller's
- Reassessment on sale. Many places reset the assessment when a home sells. In California, for example, Proposition 13 limits yearly increases for an owner, but the assessment resets to the purchase price when the home changes hands. A long-time owner's low tax bill can jump for the next buyer.
- Exemptions that don't transfer. Homestead, senior, veteran and disability exemptions belong to the owner, not the house. When they end, the tax goes up.
- Special assessments. Some areas add charges for things like schools, roads or community facilities on the tax bill. They may not show up clearly on Zillow.
What the history can tell you
- Steady rises show how fast taxes grow in that area.
- A sudden drop can mean the owner appealed the assessment, or a new exemption started.
- A big jump often follows a sale, a renovation, or a new building permit.
- Missing years usually mean the data just wasn't captured, not a problem with the property.
How to estimate your own taxes
- Find your county's tax rate, from the county assessor's or treasurer's website.
- Apply it to the price you expect to pay (or to the new assessed value, if your state assesses at a fraction).
- Add any special assessments shown on the county's tax bill for the property.
- Subtract exemptions you'll qualify for, such as a homestead exemption, and remember you usually have to apply for them.
For the exact numbers, look the property up on the county's own website, which shows the full bill. Ask your agent or lender for an estimate too, since they'll use it for your monthly payment.
When comparing several listings at once, Zillow Price/SqFt shows price per square foot on every listing card, so you can spot outliers before digging into each one's tax history.
