Property tax is a recurring annual charge that local governments place on real estate and, in some areas, certain movable property you own, and it is calculated by multiplying your property’s assessed value by the local tax rate and then subtracting any exemptions you qualify for. Counties, cities, school districts, and special districts such as fire protection zones all draw revenue from it, and the money pays for schools, roads, police and fire service, parks, and other local services. Effective rates vary widely by location, from roughly 0.27% of a home’s value in the lowest-taxed areas to over 2.2% in the highest, so where the property sits matters almost as much as what it is worth.
How the Calculation Works
Two numbers drive your bill: the assessed value and the tax rate.
The assessed value is the dollar figure your county assessor assigns to the property for tax purposes. In many places the assessor starts with an estimate of fair market value, then applies an assessment ratio set by state law to reach the taxable amount. Some jurisdictions assess at 100% of market value. Others assess at a fraction, such as 10% or 40%.
The tax rate is usually expressed as a mill rate. One mill equals $1 of tax for every $1,000 of assessed value. If your home’s assessed value is $200,000 and the combined mill rate for your county, city, and school district comes to 25 mills, the tax before exemptions is $5,000. The combined rate is the sum of what each taxing authority charges, and your bill will often show those line items separately: county, school district, special districts, and so on. You can usually find the current mill rate on your county tax collector’s website or printed on the bill itself.
How Assessed Value Is Set and Reassessed
Your assessed value does not stay fixed. Local assessors periodically update values to reflect the real estate market, and how often that happens depends on where you live. Some states reassess every year. Others follow a cycle of two to five years, and a handful allow gaps of up to ten years between reappraisals. On top of the scheduled cycle, most jurisdictions trigger an immediate reassessment when a property changes hands or when new construction is completed, so a purchase or a major renovation almost always produces a new valuation.
The reassessment schedule matters because it shapes when your bill can jump. In an area that reassesses every five years, a run-up in home values can show up as one large increase rather than a series of smaller annual adjustments. Some states soften this with caps on how much an assessed value can rise in a single year, even when market values climbed faster.
What Property Is Taxed
Taxable property falls into two categories. Real property is land and anything permanently attached to it: houses, commercial buildings, garages, barns, and similar structures, along with features above and below the surface such as trees and mineral deposits.
Personal property in the tax context means movable physical items like vehicles, boats, and business equipment. Not every jurisdiction taxes personal property. Where it is taxed, the rules usually matter most to business owners with machinery, inventory, or specialized tools, though homeowners in those areas may also owe personal property tax on vehicles or recreational equipment depending on local law.
Exemptions That Reduce the Bill
Most jurisdictions let qualifying owners knock the taxable portion of their assessed value down before the rate is applied. The reduction flows straight through to what you owe.
- Homestead exemption: Available in most states for homeowners who use the property as a primary residence. It removes a set dollar amount or percentage from assessed value. You usually have to apply rather than receive it automatically.
- Senior citizen reductions: Many states offer extra exemptions or value freezes for homeowners above a certain age, typically between 62 and 65. Some programs freeze the assessed value as long as the owner stays in the home; others give a flat reduction. Income limits often apply.
- Veteran and disability exemptions: Veterans with service-connected disabilities frequently qualify for substantial reductions, and some states exempt 100% of assessed value for veterans with total disability ratings. Separate relief programs exist in many states for owners with permanent non-service-related disabilities.
- Agricultural and conservation use: Land actively used for farming, ranching, or timber production can often be assessed at its agricultural use value rather than its higher market value. Qualifying typically requires meeting minimum acreage thresholds and showing active agricultural income or participation in a government conservation program.
- Nonprofit and religious organizations: Properties used exclusively for charitable, religious, or educational purposes are generally exempt, provided the organization meets regulatory criteria and files the required paperwork.
Rules vary significantly by jurisdiction, so check with your county assessor’s office for the list of exemptions and the application deadlines. Missing a deadline can cost a full year of savings.
How the Bill Gets Paid
Property tax bills typically go out from the county tax collector or treasurer in the fall, with payment due by a deadline set locally. Many areas split the annual amount into two installments due several months apart.
If you have a mortgage, the lender probably handles payment through an escrow account. A portion of each monthly mortgage payment goes into escrow, and the lender pays the tax bill directly when it is due. Not every mortgage requires escrow, but most conventional loans with less than 20% equity do. Review the annual escrow statement to make sure the amount being collected matches the actual bill. Shortages usually mean the monthly payment goes up to cover the difference.
Owners without a mortgage pay the bill themselves. Most counties accept payment online, by mail, or in person. Not receiving a bill in the mail does not excuse the obligation or the penalties that follow a missed deadline.
Supplemental Bills After a Purchase or Renovation
In some states, buying a home or completing new construction triggers a supplemental tax bill on top of the regular annual one. The supplemental bill covers the difference between the old assessed value and the new one, prorated for the months remaining in the tax year. New owners are sometimes surprised by these, since they arrive separately from the regular notice and are not always covered by the mortgage escrow account.
Appealing an Assessment That Looks Too High
If the assessed value on your notice seems too high, you can challenge it. Only about 3% to 5% of homeowners file appeals, but roughly 30% to 50% of those who do win some reduction.
The two strongest arguments are factual errors and overvaluation. Factual errors are the simplest fix: the records show three bathrooms when you have two, or the square footage is wrong. A phone call to the assessor’s office sometimes corrects these without a formal appeal. Overvaluation means the assessed value exceeds what the home would actually sell for, and you prove it with comparable sales data showing similar nearby homes sold for less.
After the assessment notice arrives, you generally have a limited window to protest, with deadlines ranging from 30 to 90 days depending on jurisdiction. Most appeals start at the county level with the assessor’s office or a local review board. If you are not satisfied, you can usually escalate to a county or state board of equalization and ultimately to tax court. Useful evidence includes recent comparable sales showing lower per-square-foot values, photographs of the property’s condition, and records proving errors in the assessor’s data. A professional appraisal strengthens the case but runs $300 to $650, so it mainly pays off on higher-value properties. Filing fees are usually modest or zero.
Deducting Property Tax on Your Federal Return
You can deduct property taxes paid on your home on your federal return, but only if you itemize on Schedule A instead of taking the standard deduction. The deduction covers state and local real property taxes assessed uniformly on all real property in the community, with proceeds used for general governmental purposes. Fees for specific services such as trash collection, or charges for improvements that increase your property’s value, do not count.1Internal Revenue Service. Instructions for Schedule A (2024)
The main limit is the SALT cap. Federal law caps the total state and local taxes you can deduct, including property taxes, state income taxes, and sales taxes combined. For the 2026 tax year, the cap is $40,400 for most filers, or $20,200 if married filing separately. Anything above the cap is not deductible, which can leave a significant share of property taxes undeducted for owners in high-tax states.2Office of the Law Revision Counsel. 26 US Code 164 – Taxes
The cap also phases down for higher earners. If modified adjusted gross income exceeds $505,000 ($252,500 if married filing separately) in 2026, the cap shrinks by 30 cents for every dollar above that threshold, though it cannot drop below $10,000. The increased SALT cap is scheduled to expire after 2029, reverting to the $10,000 limit starting in 2030.2Office of the Law Revision Counsel. 26 US Code 164 – Taxes
What Happens If You Do Not Pay
Skipping a property tax bill starts a chain of consequences that can eventually cost you the property. The process varies by state, but the trajectory is similar everywhere. Late penalties and interest begin accruing shortly after the due date, with annual interest rates on delinquent property taxes commonly falling between 7% and 18%, often on top of a flat percentage penalty.
If the taxes stay unpaid, the local government places a tax lien on the property. The lien takes priority over most other debts, including the mortgage, and in many states the government sells it to a private investor at a tax lien sale. A lien sale does not transfer ownership, but it starts a clock. When delinquent taxes go unresolved long enough, foreclosure follows: some jurisdictions sell the property at a tax deed sale, others use judicial foreclosure through a court. Most states give a redemption period, typically six months to three years, during which you can pay everything owed and reclaim the property. After that window closes, the loss is permanent.