Quick takeaways
- Property taxes are generally based on assessed value, which isn't always the same as your purchase price.
- In many areas, a sale can trigger a reassessment, which can raise the tax bill compared to what the seller was paying.
- Taxes are usually paid either directly by you or through your mortgage escrow account.
What property taxes generally fund
Property taxes are collected by local governments and generally help fund community services — schools, roads, emergency services, and local infrastructure are common examples, though exactly what's funded varies by location.
Assessed value vs. market value: not always the same number
Here's the part that surprises a lot of people: your tax bill usually isn't based directly on what you paid for the home. It's based on an assessed value, determined by a local assessor's office, which may differ from your purchase price or current market value. Assessment methods and schedules vary significantly by state and county.
Why your first bill might be a surprise
In many areas, a home's sale can trigger a reassessment, sometimes bringing the assessed value closer to the actual sale price. If the previous owner had held the home for a long time, their assessed value (and tax bill) may have been considerably lower than what a new assessment produces — meaning your tax bill could be noticeably different from theirs, even for the very same house.
A commonly overlooked detail
Some areas also send a separate “supplemental” tax bill after a reassessment, on top of the regular annual bill, to account for the difference during the transition period. Whether this applies to you depends entirely on local rules — worth asking your agent or a local tax office directly.
Exemptions: worth checking, not guaranteed
Many states or counties offer some form of exemption that can reduce the taxable value of a home you live in as your primary residence, often called a homestead exemption. Eligibility rules, savings amounts, and application deadlines vary widely and are set locally — it's worth checking what, if anything, applies where you're buying, since these are sometimes not applied automatically.
How property taxes are typically paid
- Through a mortgage escrow account — a portion collected monthly and paid by your servicer, discussed in How Mortgage Escrow Accounts Work
- Directly by you — if you don't have an escrow account, you'd typically pay the local tax authority yourself, often on a schedule set by that jurisdiction
If you think an assessment is too high
Most areas have some kind of formal appeal process for disputing an assessed value, though procedures, deadlines, and evidence requirements vary by jurisdiction. A local assessor's office can generally explain the specific steps where you live.
What this guide is not
This explains general concepts only, not the specific tax rules, rates, or exemptions where you're buying — those are set locally and change over time. A local tax assessor's office or a real estate attorney can confirm current, specific figures.