Your property tax bill depends on your home's assessed value and your local tax rate
Property tax is calculated by multiplying your home's assessed value by your local tax rate, expressed as a percentage or per $1,000 of value. A home assessed at $300,000 in a jurisdiction with a 1% tax rate costs $3,000 per year. A home assessed at the same value in a jurisdiction with a 1.5% rate costs $4,500. The assessed value is not the price you paid — it's what the assessor believes the home is worth, and it's set by your county or municipality, not by you or your lender.
The tax rate itself varies dramatically by location. Some counties charge less than 0.5% annually; others charge 2% or more. Within a single state, rates can differ by a factor of three or four between neighboring counties. This is why property tax is one of the largest differences in housing cost between regions — a $400,000 home might cost $2,000 per year in taxes in one place and $8,000 in another.
Key Takeaways
- Your property tax bill equals your home's assessed value multiplied by your local tax rate, which is set by your county or municipality.
- The assessed value is determined by a county assessor and is usually updated every one to three years, not based on what you paid for the home.
- Tax rates vary widely by location — from under 0.5% to over 2% of home value annually — so where you buy matters as much as what you pay.
- Your mortgage lender may require you to pay property tax through an escrow account as part of your monthly payment, even though the tax bill itself comes from your local government.
- Homestead exemptions, senior exemptions, and other local programs can reduce your assessed value or tax bill, but you must file for them yourself.
How assessed value is determined and when it changes
The county assessor's office estimates your home's value based on recent sales of similar homes in your area, the condition of your property, square footage, lot size, and other features. This is not an appraisal done by a professional appraiser — it's an administrative estimate, and it's often less precise. Assessors may visit your home every few years or rely on public records and photos; practices vary by county.
Assessed values are typically updated every one to three years, depending on your state and county. Some jurisdictions reassess annually; others do it every three years. A few states, including California, cap how much the assessed value can increase each year even if the market value rises sharply — this is called a Proposition 13 style cap, and it means your tax bill can stay nearly flat for decades if you don't sell. Other states reassess at market value every time the property changes hands, so your tax bill can jump significantly after you buy.
You can usually challenge an assessed value if you believe it's too high. The process is called an assessment appeal or tax assessment protest, and it typically involves filing a form with your assessor's office and providing evidence — recent appraisals, comparable sales, or photos of damage or deferred maintenance. The deadline to file is usually 30 to 60 days after you receive your assessment notice, so mark your calendar when the notice arrives.
Tax rates and how they're set in your area
Your local tax rate is set by your county, municipality, school district, and sometimes special districts (fire, water, library). Each entity sets its own rate, and they add together to create your total rate. A property in one county might pay 0.8% to the county, 0.4% to the school district, 0.15% to the city, and 0.1% to a fire district — totaling 1.45%. Move three miles away to a different school district, and the rate might be 1.65%. These rates are public information, usually posted on your county assessor's or tax collector's website.
Tax rates do not change based on your individual circumstances — everyone in the same taxing jurisdiction pays the same rate on their assessed value. However, some jurisdictions offer exemptions that reduce the assessed value itself. A homestead exemption might reduce your assessed value by $25,000 or $50,000, which lowers your tax bill. Senior exemptions, disability exemptions, and veteran exemptions are common in many states. You must file for these yourself — the assessor's office will not automatically grant them.
How your mortgage payment and escrow account work
If you have a mortgage, your lender almost certainly requires you to pay property tax through an escrow account, also called an impound account. Each month, you pay one-twelfth of your estimated annual property tax as part of your mortgage payment. The lender holds this money in escrow and pays your tax bill when it's due. This protects the lender — if you stopped paying taxes, the county could foreclose on the home, wiping out the lender's security.
Your lender estimates your annual tax bill based on the assessed value at the time you close. If your assessed value increases at the next reassessment, your escrow payment will increase too, usually at your next annual escrow analysis. The lender will send you a notice showing the new payment amount. If your assessed value drops or you receive an exemption, your payment may decrease. You can request an escrow analysis anytime if you believe the estimate is significantly off.
If you pay off your mortgage, you are no longer required to use escrow — you can pay your property tax bill directly to your county tax collector. Some people choose to do this anyway to have more control over the timing, though it requires you to remember to pay on time or face penalties and interest.
What happens if you don't pay property tax
Property tax bills are due on a specific date set by your county — often January 31 or April 10, though dates vary. If you miss the deadline, you owe a penalty, usually 10% of the unpaid amount, plus interest that accrues daily. After a period of non-payment (typically three to five years, depending on your state), the county can place a tax lien on your home or sell it at a tax sale to recover the debt. This is one of the few debts that can result in losing your home without a court foreclosure process.
If you have a mortgage and use escrow, your lender is responsible for paying the bill on time, so this risk is low. If you pay directly or if you've paid off your mortgage, mark the due date on your calendar and set a reminder. If you face a hardship and cannot pay, contact your county tax collector's office immediately — many jurisdictions offer payment plans or temporary deferrals for seniors or people with disabilities.
Comparing property tax across different locations
Property tax is one of the largest variables in housing cost between regions. A $400,000 home in a low-tax county might cost $2,000 to $3,000 per year in property tax, while the same home in a high-tax county could cost $6,000 to $8,000 or more. Over a 30-year mortgage, this difference adds up to tens of thousands of dollars.
When you're considering buying in a new area, ask your real estate agent or lender for the property tax rate and the assessed value of comparable homes. You can also search your county assessor's website directly — most publish tax rates and allow you to look up individual properties. Factor this into your total housing cost alongside mortgage interest, insurance, and maintenance. A home that seems affordable on the mortgage payment alone may be expensive when property tax is included.
Frequently Asked Questions
Can I deduct property tax on my federal income tax return?
Yes, but only if you itemize deductions on your federal return, and only up to $10,000 per year in total state and local taxes (including property tax, income tax, and sales tax combined). Most homeowners now take the standard deduction instead, which means they don't benefit from the property tax deduction. Consult a tax professional about your specific situation.
What's the difference between assessed value and market value?
Market value is what your home would sell for today. Assessed value is what the county assessor estimates it's worth for tax purposes. They're often different — assessed value may lag behind market value, especially in fast-appreciating areas, or it may be higher in areas where the market has declined. The assessed value is what determines your tax bill.
Do I have to pay property tax if I own my home outright?
Yes. Property tax is owed by the owner of the property, regardless of whether there's a mortgage. If you own the home free and clear, you pay the tax bill directly to your county tax collector. The lender requirement for escrow only applies when there's a loan.
How often can my property tax bill increase?
That depends on your state and county. Some jurisdictions reassess every year, so your bill can change annually. Others reassess every three years. A few states cap annual increases even if market value rises — for example, California caps increases at 2% per year unless the property is sold. Check your county assessor's website to learn the reassessment schedule in your area.
What if I think my assessed value is wrong?
File an assessment appeal with your county assessor's office. The deadline is usually 30 to 60 days after you receive your assessment notice. You'll need to provide evidence — a recent appraisal, comparable sales data, or documentation of damage or needed repairs. The process is free, and if you win, your assessed value and tax bill will be reduced.