It’s one of the most common property-tax questions: my house is just like the one down the street, so why is my tax bill higher? Almost always, the answer is that the two homes are not taxed the same, even if they’d sell for the same price.
Key idea. Property tax is levied on assessed taxable value, not market price. Two identical homes can have very different taxable values — and very different bills. How property taxes are calculated.
1. When each home was last assessed (and caps)
Many states cap how fast assessed value can rise for an existing owner (say 2–3% a year). A neighbor who bought 15 years ago may have an assessed value far below current market, while a recent buyer is assessed at today’s value. Same house, very different taxable value.
This is why buying a home can reset the tax — a sale often triggers a reassessment to market value, so don’t assume you’ll pay what the seller paid.
2. Different exemptions
| Owner A | Owner B |
|---|---|
| Claims homestead + senior exemption | Claims no exemption |
| Taxable value reduced by, say, $75,000 | Full assessed value taxed |
| Lower bill | Higher bill |
Exemptions — homestead, senior, veteran, disability — directly shrink the taxable base. If one owner qualifies (or simply applied) and the other didn’t, the bills diverge.
3. Different tax districts
Property-tax rates are the sum of overlapping districts: county, city/town, school district, and special districts (fire, water, library, sewer). Two homes a block apart can sit in different school or special districts and face different combined rates — even within the same county.
4. One of them appealed
If a neighbor appealed their assessment and won a reduction, their taxable value — and bill — dropped, while yours stayed put.
5. Record errors
Assessor records sometimes overstate square footage, bedroom count or lot size for one home and not another. That inflates one assessed value relative to the other.
What to do about it
- Compute your effective rate (bill ÷ market value) and compare it to your county median.
- Confirm you claim every exemption you qualify for.
- Check your property record for errors.
- If you’re clearly over-assessed versus comparable sales, appeal.
Use the estimator to model your bill at a fairer assessed value, and see your state’s page for how much rates vary even between nearby counties.