Ad Valorem
Latin for "according to value." The basis for most U.S. property taxes — your tax bill is calculated as a percentage of your property's assessed value, not a flat fee.
Appraisal (Mass Appraisal)
The systematic process of estimating market values for all taxable properties in a jurisdiction simultaneously. County assessors use statistical models to update thousands of property values at once, usually on a 1–4 year cycle.
Assessed Value
The dollar value assigned to a property by the county assessor for taxation purposes. Often a percentage of market value (e.g., 60% or 100%), depending on state law. Assessed value × millage rate = your tax bill.
Assessment Ratio
The percentage of a property's market value subject to taxation. If your state has a 25% assessment ratio, a $200,000 home is taxed on only $50,000 of value.
Assessment Roll
The official county-wide list of all taxable properties and their assessed values, updated annually before bills are calculated.
Board of Equalization (BOE)
A government body that reviews property tax assessments to ensure uniformity and fairness across a county or state. Also the body that hears formal assessment appeals.
Budget Rate
The millage rate calculated each year by local governments to raise enough revenue to fund their approved budgets. Higher budgets require higher millage rates (if assessed values stay flat).
Cap Rate (Assessment Cap)
A state-mandated limit on how much a property's assessed value can increase in a single year. Florida's homestead cap (3%) and California's Prop 13 (2%) are famous examples.
Capitalization Rate
In commercial property taxation, the rate used to convert a property's net operating income into an estimated market value. Higher cap rates = lower valuations.
Circuit Breaker
A type of property tax relief program that limits taxes to a fixed percentage of household income — the excess "trips the circuit breaker" and is forgiven or deferred. Common for low-income seniors.
County Assessor
The elected or appointed official responsible for valuing all taxable real property in a county and maintaining the assessment roll. Also called County Appraiser or Tax Assessor-Collector in some states.
Delinquent Taxes
Property taxes that were not paid by the official due date. Delinquent taxes accrue penalties (typically 5–10% immediately) plus monthly interest (1–1.5%), and can eventually lead to a tax lien or tax sale.
Deed
The legal document that transfers ownership of real property from one party to another. Deeds are recorded at the county recorder's office and establish who bears the property tax obligation.
Effective Tax Rate
The ratio of the actual property tax paid to the property's market value, expressed as a percentage. Unlike the nominal millage rate, this accounts for assessment ratios and exemptions, making cross-county comparisons meaningful.
Equalization
A process to ensure that all properties within a jurisdiction are assessed at the same percentage of market value, preventing inequitable taxation between different property types or neighborhoods.
Exemption
A legal reduction in the taxable assessed value of a property. Common types include Homestead (primary residence), Senior (age 65+), Veteran (honorably discharged), and Disability exemptions. Must be applied for — never automatic.
Fair Market Value
The price a knowledgeable, willing buyer would pay a knowledgeable, willing seller for a property in an arm's-length transaction. This is the benchmark assessors use for valuation.
Fiscal Year
The 12-month period used for government budgeting and tax collection. Most counties operate on a July–June or October–September fiscal year, which may differ from the calendar tax year.
General Levy
The portion of the property tax rate allocated to the county's general operating fund, covering administration, courts, and other non-special-purpose government services.
Greenbelt / Agricultural Assessment
A special valuation method for land actively used for farming, ranching, or timber production. Land is assessed based on its agricultural use value rather than potential development value — often 60–90% lower. Changing the land use triggers rollback taxes.
Homestead Exemption
The most common property tax exemption. Reduces the taxable assessed value of your primary residence by a flat dollar amount or percentage. In Florida, the homestead also caps annual assessment increases at 3%.
Homestead Declaration
A legal filing that establishes your property as a homestead, triggering exemption benefits and (in some states) creditor protection against forced sale.
Improvement
In property tax terminology, any structure permanently attached to land — buildings, pools, fences, driveways. Land and improvements are often assessed separately.
Installment Plan
A payment arrangement allowing a delinquent taxpayer to pay back taxes plus penalties in a series of scheduled payments rather than a lump sum.
Levy
The total dollar amount of property taxes a government body is authorized to collect in a given year. The levy ÷ total assessed value = the millage rate needed to raise that amount.
Lien
A legal claim against a property as security for an unpaid debt. A property tax lien is automatically superior to most other liens, including mortgages, meaning unpaid taxes must be settled before a property can be sold with clear title.
Market Value
The most probable price a property would sell for in a competitive open market. The assessor's primary target for valuation. Also called "Fair Market Value" or "Just Value" in some states.
Mill / Millage Rate
One mill = $1 of tax per $1,000 of assessed value (0.1%). A millage rate of 15 mills means $15 per $1,000 assessed value (1.5%). Your total millage rate is the sum of all overlapping taxing jurisdictions: county + city + school district + special districts.
Municipal Utility District (MUD)
A special taxing district that provides infrastructure (water, sewer, drainage) to a development area. MUD taxes are added on top of standard county and school district levies, often adding 0.5–2% to total effective rates in newer suburban areas.
Notice of Appraised Value (NOAV)
The official document mailed by the county assessor each spring notifying the property owner of the newly assessed value. This notice starts the clock on the appeal filing window (typically 30–90 days).
Non-Ad Valorem Assessment
A special assessment charged at a flat rate regardless of property value, typically to fund specific infrastructure like drainage, lighting, or fire protection. Appears on the tax bill but is not a percentage of assessed value.
Overlapping Taxing Jurisdiction
Multiple government bodies (county, city, school district, hospital district, MUD) each levy their own tax on the same property. Their individual millage rates are added together to form the total effective rate.
Parcel ID (Parcel Number)
A unique identification number assigned to every taxable parcel of land in a county. Required for online property tax payments and searches. Found on your tax bill, deed, and county assessor records.
Personal Property Tax
A tax on movable business assets — equipment, machinery, inventory, vehicles (in some states). Separate from real property tax. Most residential homeowners are not subject to personal property tax.
Protest / Appeal
The formal process a property owner uses to challenge their assessed value. Must be filed within a strict deadline after receiving the Notice of Appraised Value. Success typically requires comparable sales data or documented property defects.
Reassessment
When the county updates assessed values across all or part of the jurisdiction to reflect current market conditions. States like New Jersey reassess annually; many others do it every 3–4 years.
Rollback Rate
The maximum tax rate a government body can adopt without triggering an automatic rollback election. Also the back-taxes triggered when a property leaves an agricultural or greenbelt designation.
School District Levy
Typically the largest single component of a residential property tax bill, funding K-12 public education. State and local school funding formulas determine how much the district must raise from property taxes.
Special Assessment District (SAD)
A defined area where property owners are charged a special levy to fund a specific improvement that benefits only that area (e.g., a new road, sidewalk, or water main). Unlike general taxes, SADs are often one-time or time-limited charges.
Tax Lien
A claim recorded against a property for unpaid taxes. In most states, tax liens are superior to all other liens. After a statutory period (varies by state), the county may sell the lien at auction to investors who pay the taxes and charge the owner redemption interest.
Tax Rate (Nominal Rate)
The stated millage rate expressed as a percentage, before accounting for assessment ratios or exemptions. Contrast with effective tax rate, which reflects actual taxes paid as a percentage of market value.
Tax Sale
A public auction where the government sells tax liens (or deeds in some states) on delinquent properties to recover unpaid taxes. Property owners typically have a redemption period to pay the lien plus interest before losing the property.
Taxable Value
The assessed value after all applicable exemptions have been subtracted. Taxable value × millage rate = your tax bill. Example: $200,000 assessed value − $25,000 homestead exemption = $175,000 taxable value.
Treasurer / Tax Collector
The county official responsible for billing and collecting property taxes. Distinct from the Assessor (who values properties). Payments go to the Treasurer; appeals go to the Assessor's office.
Valuation Date (Appraisal Date)
The specific date as of which the assessor determines market value. Usually January 1 of the tax year. A property's condition and market value on this date determines the tax bill for the following year.
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