Annual property tax is calculated by your local assessor, who estimates your property's value, then multiplies that value by your area's tax rate to produce a bill you pay once or twice yearly.
The amount you owe depends on three things: what your assessor says your property is worth, what percentage of that value your county or municipality taxes, and whether you own the land outright or have a mortgage. If you have a mortgage, your lender usually collects the tax from your monthly payment and pays the assessor directly — you never see a separate bill. If you own the property free and clear, the assessor sends you a bill directly, typically once a year but sometimes split into two payments.
The tax rate itself is set by your local government and varies widely by location. A property worth $300,000 might owe $3,000 a year in one county and $6,000 in another. The assessor's estimate of your property's value is what drives the largest swings in what you pay, and that estimate can change every year or every few years depending on your state's reassessment schedule.
Key Takeaways
- Your annual property tax bill comes from your assessor's estimate of your property's value multiplied by your local tax rate, which is set by your county or municipality.
- If you have a mortgage, your lender collects the tax from your monthly payment and pays it to the assessor; if you own the property outright, you receive a bill directly from the assessor.
- The assessor may reassess your property's value every year, every three years, or on a different schedule depending on your state, which means your tax bill can change annually.
- You can usually challenge your assessor's valuation by filing a formal objection within a set window after you receive your bill, though the process and important date vary by location.
How the assessor determines your property's value
Your local assessor's office is responsible for estimating what your property is worth. They do this by looking at recent sales of similar properties in your area, the condition and size of your building, the land itself, and any improvements you have made. They do not use the price you paid for the property unless you bought it very recently — they use what they think it would sell for today.
Assessors typically reassess properties on a schedule set by state law. Some states require a reassessment every year. Others do it every three years, every five years, or only when the property changes hands. You can find your state's reassessment schedule by calling your county assessor's office or checking their website. The schedule matters because it determines how often your tax bill can jump.
The assessor's estimate is not a market appraisal and is not meant to be perfectly accurate for your specific property. It is a mass valuation tool applied to thousands of properties at once. This is why two nearly identical houses on the same street can have different assessed values — the assessor may have incomplete information about one of them, or may have made an error.
What tax rate means and where it comes from
The tax rate is the percentage of your property's assessed value that you owe in tax each year. It is expressed as a dollar amount per $1,000 or $100,000 of assessed value. For example, a rate of $15 per $1,000 of assessed value means you owe $15 for every $1,000 your property is worth. On a $300,000 property, that would be $4,500 per year.
Your local government — usually the county, but sometimes the city or a special district — sets the tax rate by deciding how much money it needs to collect and dividing that by the total assessed value of all properties in the area. This means the rate can change year to year as the government's budget needs change. A rate might be $12 per $1,000 one year and $14 the next if the county decides it needs more revenue.
Some states cap how much the tax rate can increase in a single year, or cap how much an individual property's assessed value can rise annually. These are called assessment caps or tax caps. California's Proposition 13, for example, limits how much an assessed value can increase each year even if the market value of the property rises sharply. Check your state's rules to see whether a cap applies to you.
How your bill is calculated and when you pay
Once the assessor has your property's value and your local government has set the tax rate, the calculation is straightforward: assessed value × tax rate = annual tax owed. If your property is assessed at $250,000 and your tax rate is $12 per $1,000, you owe $3,000 for the year.
Most jurisdictions bill property tax once a year, usually in the fall or early winter. Some split the bill into two payments — one in the fall and one in the spring. A few allow quarterly payments. Your bill will state the due date and any penalties for late payment. Penalties typically start accruing 30 to 60 days after the due date, depending on your location, and can reach 10 to 20 percent of the unpaid amount if left long enough.
If you have a mortgage, your lender collects the tax as part of your monthly payment. The lender holds the money in an escrow account and pays the assessor when the bill comes due. You will see the tax amount listed separately on your mortgage statement, but you do not write a check to the assessor yourself. If you pay off your mortgage, you become responsible for paying the tax bill directly.
Homestead exemptions and other reductions
Many states offer a homestead exemption, which reduces the assessed value of your primary residence by a fixed amount — often $25,000 to $50,000, though the amount varies by state. This lowers your tax bill automatically if you own and live in the home. You typically claim the exemption by filing a form with your assessor's office, usually once, though some states require you to renew it annually.
Other exemptions may be available if you are over a certain age, disabled, a veteran, or a surviving spouse of a veteran. Agricultural land, forest land, and other special-use properties often receive lower assessments than residential or commercial land. Check your assessor's website or call their office to see what exemptions you might be may have access to to claim. Missing an exemption you may have access to for means paying more tax than you have to.
Some states also offer tax deferral programs that let you delay paying property tax if you are elderly or disabled and have limited income. The tax still accrues and becomes a lien on your property, but you do not have to pay it while you live there. The debt is typically paid from your estate after you sell or pass away. These programs are rare and have strict income limits, so ask your assessor whether one exists in your area.
Challenging your assessed value
If you believe your assessor has overestimated your property's value, you can file a formal objection, usually called an assessment appeal or tax assessment challenge. The process and important date vary by state and county. Most jurisdictions give you 30 to 45 days after you receive your bill to file, though some allow longer. Missing the important date usually means you cannot challenge that year's assessment.
To file an appeal, you typically submit a form to your assessor's office or a separate board of appeals, along with evidence that the assessed value is too high. Evidence might include a recent appraisal, sales prices of comparable properties, photographs showing the property's condition, or documentation of damage or needed repairs. Some jurisdictions allow you to present your case in person; others decide based on written submissions alone.
A successful appeal lowers your assessed value, which lowers your tax bill for that year and potentially future years. However, appeals do not always succeed — assessors are often upheld. If you lose at the local level, some states allow you to appeal to a higher board or court, but this is expensive and time-consuming. Before filing an appeal, check whether your county publishes assessment data online so you can see what similar properties are assessed at and whether a gap exists.
How property tax changes when you buy or sell
When you buy a property, the assessor typically reassesses it at or near the purchase price, especially if the sale is recent. This can cause a sharp jump in your tax bill compared to what the previous owner paid. Some states soften this jump with an assessment cap that limits how much the value can increase in the first year after purchase. Other states have no cap and your bill can double or triple when ready.
When you sell, you are responsible for property tax up to the date of sale. Your closing statement will show a proration — the seller's share of the year's tax and your share, calculated by the number of days each of you owned the property. If the seller has already paid the full year's tax, you will reimburse them for the portion that belongs to you. If the tax has not been paid yet, you may be responsible for it at closing.
Frequently Asked Questions
Can my property tax bill go down if my home loses value?
Yes, but only if you challenge the assessment or if your state's reassessment process catches the decline. Assessors do not automatically lower values when the market falls. You must file an appeal and provide evidence — such as a recent appraisal or comparable sales — that your property is worth less than the assessed value. If you succeed, your bill will drop for future years.
What happens if I do not pay my property tax bill?
The assessor will charge penalties and interest, typically starting 30 to 60 days after the due date. If you do not pay for several years, the county can place a lien on your property, meaning they have a legal claim against it. In some cases, the county can foreclose and sell your property to recover the unpaid tax, though most states have redemption periods that give you time to pay before that happens.
Does my property tax bill include school taxes?
In most states, yes. Your property tax bill funds not just the county but also local schools, fire departments, and other services. The bill usually shows a breakdown of how much goes to each entity. The school portion is often the largest part. Some states allow school districts to set their own tax rates separately from the county.
How do I find out what my property is assessed at?
Your assessor's office maintains a public record of all assessed values in your county. You can usually search by address on the assessor's website for free. If the website does not have a search tool, call the assessor's office and ask for your property's assessed value and the date of the last assessment. You can also visit the office in person to view the assessment record.
Will my property tax bill increase every year?
Not necessarily. If your state has an assessment cap, your value may increase by only a small percentage each year even if the market value rises faster. If your state reassesses only every few years, your bill may stay the same for several years, then jump when the reassessment happens. The tax rate itself can also change year to year based on your local government's budget needs.