This property tax glossary explains the words and phrases every homeowner runs into — from “assessed value” and “mill rate” to “homestead exemption” and “notice of protest” — in plain English. Use the search box or the A–Z filter to find any term fast, then tap it to read a clear, jargon-free definition. Many entries link straight to our in-depth guides so you can see how each rule works and what it means for your bill.
Why a Property Tax Glossary Matters
Owning a home means opening assessment notices and tax bills full of language that can feel built to confuse you. A clear property tax glossary turns that wall of jargon into plain English, so you can understand exactly what your assessor is doing and whether you might be overpaying. Whether you just got a notice that your value jumped, you are deciding whether to appeal, or you simply want to understand your bill before it is due, knowing the right words is the first step to paying less. Every definition in this property tax glossary focuses on what a term means for you as a homeowner, not on abstract tax theory.
Property tax in the United States is the most local tax there is. It is set by counties, cities, school districts, and special districts, which is why the same word can carry different weight depending on where you live. An “assessment cap” might freeze your value in one state and not exist at all in another.
How your home is valued, which exemptions you can claim, how much notice you get before a rate changes, and when your bill is due all shift from state to state and county to county. That is why this property tax glossary pairs simple definitions with links to our detailed guides, so you can move from understanding a term to seeing how it actually works where you live.
The Most Important Property Tax Terms to Know First
If you only learn a handful of terms from this property tax glossary, start with these. Your assessed value is the dollar figure your local assessor puts on your home; your tax bill is roughly that value times the tax rate, minus any exemptions. The mill rate (also called millage) is the tax per $1,000 of value — the number that turns your assessment into a dollar amount. The effective tax rate is your annual tax divided by your home’s market value, and it is the fairest way to compare one area to another.
On the savings side, the terms that matter most are homestead exemption, over-assessment, and notice of protest. A homestead exemption lowers the taxable value of your main home; an over-assessment means the assessor valued your home too high, making your bill too high; and a notice of protest (or appeal) is how you formally challenge that value. Learning these core property tax terms gives you the foundation to use the full glossary below with confidence.
For trusted national data and research on how property taxes work across states, you can also consult the Tax Foundation and the U.S. Census Bureau. These national sources complement the state-and-county guidance linked throughout this property tax glossary.
How to Use This Property Tax Glossary
This property tax glossary is built for homeowners, not tax professionals. Every definition is written in everyday language and focuses on what a term actually means for your bill. Type any word into the search box to filter instantly, or tap a letter to jump to that part of the alphabet — grey letters have no entries. Each term carries a colored tag showing its topic — assessment, appeals, exemptions, rates and billing, payment and liens, or general — so you can see at a glance what part of property tax it belongs to.
Because property tax is set mostly at the local level, the exact rule behind many of these terms depends on where you live. Wherever a term connects to a bigger topic, the definition links to our guides on how to appeal and lower your taxes, exemptions and relief, and property tax basics. Start with the term here, then follow the link to see how it applies where you live.
This property tax glossary is provided for general information only and is not legal, tax, or financial advice. Definitions are simplified for everyday readers, and property tax law varies by state, county, and district and changes over time. Know Property Tax is an independent educational resource, not a government agency, a county assessor, or a tax-appeal service. For advice about your specific situation, confirm the details with your county assessor and a licensed professional. Last reviewed July 2026.