Real estate taxes start with an assessment of your property's value, then multiply that value by your local tax rate

Real estate tax bills come from a straightforward formula: your property's assessed value times your local tax rate. The assessed value is not the price you paid or what your home could sell for—it is a value set by your county or municipality, usually lower than market value. Your tax rate is set by your local government and expressed as a percentage or per $1,000 of assessed value. The result is what you owe each year.

The process varies by state and county because each place sets its own assessment methods and tax rates. Some counties reassess every year; others do it every three to five years. Some states cap how much the assessed value can rise annually, even if your home's market value climbs. Understanding how your specific county works saves you from surprises when your bill arrives.

Key Takeaways

  • Your real estate tax bill equals your property's assessed value multiplied by your local tax rate, which your county or municipality sets.
  • The assessed value is determined by a county assessor and is often lower than your home's actual market value or purchase price.
  • Tax rates vary widely by location and are expressed either as a percentage or as a dollar amount per $1,000 of assessed value.
  • Some states cap annual increases in assessed value even when property values rise, while others reassess at different intervals.
  • Your bill may include school district taxes, county taxes, and municipal taxes all combined into one payment.

How the county assessor determines your property's assessed value

Your county assessor's office is responsible for estimating what your property is worth. They do this by looking at recent sales of similar homes in your area, the condition of your building, the size of your lot, and any improvements you have made. They may visit your property in person, or they may use public records and photographs. The goal is to estimate what your home would sell for on the open market—though the assessed value they arrive at is typically 80 to 90 percent of that market value, depending on your state's rules.

Assessors in most counties reassess properties on a set schedule. Some do it annually; others every three or five years. When a reassessment happens, your assessed value may go up, down, or stay the same depending on what has happened to similar properties in your neighborhood. If you believe the assessment is wrong—because your home is in worse condition than the assessor assumed, or because comparable sales were undervalued—you can file an appeal with your county assessor's office. The process and important date for appeals vary by county, so check your local assessor's website for the rules in your area.

Understanding tax rates and how they are set

Your local tax rate is set by your county, city, school district, and sometimes special districts like fire or water authorities. Each of these bodies sets its own rate, and they are added together to create your total tax rate. In some places, the rate is shown as a percentage—for example, 1.2 percent of assessed value. In others, it is shown as a dollar amount per $1,000 of assessed value—for example, $12 per $1,000, which is the same as 1.2 percent.

Tax rates change year to year because local governments adjust their budgets. If your school district needs more money, the school tax rate rises. If your county cuts spending, the county rate may fall. You will see these changes reflected in your tax bill, even if your home's assessed value stays the same. Some states, like California and Florida, limit how much the tax rate can rise in a single year, while others have no such cap.

The difference between assessed value and market value

Your home's market value is what a buyer would pay for it today. Your assessed value is what the county assessor estimates it is worth for tax purposes. These are almost never the same number. In most states, the assessed value is deliberately set lower—often at 50 to 90 percent of market value—to keep tax bills manageable. A few states, like Maryland and New Jersey, assess at close to 100 percent of market value.

The gap between assessed and market value matters because it means your tax bill does not rise dollar-for-dollar with your home's actual value. If your neighborhood's home prices jump 20 percent in a year, your assessed value may rise only 5 percent, or it may not rise at all if your county is in a reassessment year. This protects homeowners from sudden, large tax increases, but it also means your tax bill does not always reflect current market conditions.

State caps on assessment increases and how they work

Many states limit how much your assessed value can rise in a single year, even if your home's market value climbs sharply. California's Proposition 13, for example, caps annual increases at 2 percent unless the property is sold. Florida allows increases of up to 3 percent per year. Texas has no statewide cap but allows some homeowners to freeze their assessed value if they meet certain conditions. These caps protect long-term homeowners from tax shock, but they also mean newer residents in the same neighborhood may pay more in taxes than their neighbors with identical homes.

If your state has a cap, it usually resets when you sell the property. The new owner's assessed value is based on the sale price, and the cap begins again from that higher number. This is why two identical homes on the same street can have very different tax bills—the one that sold recently has a higher assessed value and pays more tax.

What is included in your real estate tax bill

Your annual real estate tax bill is usually a single payment that combines taxes from multiple sources. The largest portion is typically the school district tax, which funds public schools. The next is usually the county tax, which pays for county services like roads and courts. You may also see a city or municipal tax, a library tax, a fire district tax, or a water authority tax. Each of these is calculated separately using the same assessed value, then added together.

Your bill will show a breakdown of each component so you can see where your money goes. If you pay through an escrow account (because you have a mortgage), your lender collects the full amount each month and pays the bill when it is due. If you own your home outright, you receive a bill directly from your county and pay it yourself, usually once or twice a year depending on your location.

How to find your assessed value and tax rate

Your county assessor's office maintains public records of every property's assessed value. You can find this information by visiting your county assessor's website and searching by address or parcel number. Most counties now offer online databases where you can look up your property in minutes. Your tax bill itself also shows your assessed value and the tax rate applied to it, so you can work backward to verify the math.

If you want to understand your tax rate in detail, ask your county assessor's office for a breakdown showing the school rate, county rate, city rate, and any special district rates. This helps you see which services consume the largest share of your tax dollar. Some counties publish this information online; others will mail it to you on request.

Frequently Asked Questions

Why is my assessed value different from what I paid for my house?

The assessed value is an estimate of market value set by the county for tax purposes, while your purchase price is what you negotiated with the seller. If you bought years ago, your assessed value may be lower because home values have risen. If you bought recently, your assessed value may be lower because most states assess at less than 100 percent of market value. Check your county assessor's website to see the assessment ratio in your area.

Can I appeal my assessed value if I think it is too high?

Yes. Most counties allow you to file an appeal within a set window each year—often 30 to 60 days after you receive your tax bill. You will need to show evidence that your home is worth less than the assessed value, such as a recent appraisal, photos of damage or needed repairs, or sales data for comparable homes. Contact your county assessor's office for the appeal important date and process in your area.

What happens if I do not pay my real estate taxes?

If you miss a payment, your county will charge a penalty and interest. If you continue not to pay, the county can place a lien on your property or eventually foreclose and sell it to recover the unpaid taxes. The timeline varies by state—some allow several years before foreclosure, while others move faster. If you are struggling to pay, contact your county tax collector about payment plans or hardship programs.

Do I have to pay real estate taxes if I own my home outright?

Yes. Real estate taxes are owed by the property owner regardless of whether there is a mortgage. If you have a mortgage, your lender requires you to pay taxes through escrow. If you own the home free and clear, you receive a bill directly and must pay it yourself. Failure to pay results in penalties, interest, and eventually a tax lien or foreclosure.

Why did my tax bill go up even though my assessed value stayed the same?

Your tax rate changed. Local governments adjust their tax rates annually based on their budgets. If your school district, county, or city increased spending, the tax rate rose, and your bill rose even though your assessed value did not. Check your tax bill for a breakdown showing the previous year's rate and the current year's rate for each component.