How to Calculate Property Taxes: Complete Guide
Property tax is an annual tax levied by local governments on real estate based on the property’s assessed value. To calculate it, multiply your home’s assessed value by your local tax rate (mill rate). For example, a home assessed at $300,000 in a jurisdiction with a 1.5% rate owes $4,500 per year. Property taxes fund schools, roads, fire departments, and other local services.
Quick Answer
- *According to the U.S. Census Bureau, the average American household pays $3,119 per year in property taxes.
- *According to the Tax Foundation (2026), effective rates range from 0.27% in Hawaii to 2.23% in New Jersey.
- *Formula: Annual Property Tax = Assessed Value × Tax Rate. Many areas assess at 80–100% of market value.
- *According to the National Taxpayers Union Foundation, 30–60% of properties are over-assessed, meaning homeowners may be overpaying.
How Property Taxes Are Calculated
Property tax calculations involve two components: the assessed value of your property and the tax rate set by your local government.
Annual Property Tax = Assessed Value × Tax Rate
Step 1: Determine Assessed Value
Your local tax assessor determines your property’s assessed value, which may differ from market value. Many jurisdictions use an assessment ratio— a percentage of the market value. For example, if your home’s market value is $400,000 and your county assesses at 80%, the assessed value is $320,000.
Step 2: Apply Exemptions
Before calculating taxes, subtract any exemptions you qualify for. Common exemptions include:
- Homestead exemption: Reduces assessed value for primary residences (varies by state; Texas offers up to $100,000 for school taxes)
- Senior citizen exemption: Additional reduction for homeowners over 65
- Veteran exemption: Partial or full exemption for military veterans
- Disability exemption: Additional relief for disabled homeowners
Step 3: Multiply by Tax Rate (Mill Rate)
The mill rate is the amount of tax per $1,000 of assessed value. One mill equals $1 per $1,000. Your total mill rate is the sum of rates from all taxing authorities: county, municipality, school district, and any special districts.
Property Tax Calculation Example
| Step | Calculation | Result |
|---|---|---|
| Home market value | — | $400,000 |
| Assessment ratio (80%) | $400,000 × 0.80 | $320,000 |
| Homestead exemption | $320,000 - $50,000 | $270,000 |
| Mill rate (25 mills = 2.5%) | $270,000 × 0.025 | $6,750/year |
| Monthly amount | $6,750 / 12 | $562.50/month |
Property Tax Rates by State: Highest and Lowest
According to the Tax Foundation (2026), effective property tax rates vary dramatically by state:
| State | Effective Rate | Tax on $350K Home |
|---|---|---|
| New Jersey | 2.23% | $7,805 |
| Illinois | 2.07% | $7,245 |
| Connecticut | 1.92% | $6,720 |
| Texas | 1.68% | $5,880 |
| National Average | ~1.1% | $3,850 |
| Colorado | 0.49% | $1,715 |
| Alabama | 0.39% | $1,365 |
| Hawaii | 0.27% | $945 |
These are effective rates, meaning they account for exemptions and assessment ratios. Your actual tax bill may vary based on local jurisdictions within each state.
How Property Taxes Affect Your Mortgage Payment
Most mortgage lenders require you to pay property taxes monthly as part of your mortgage payment. The lender holds these funds in an escrow account and pays the tax bill on your behalf. Your total monthly payment (PITI) includes:
- Principal
- Interest
- Taxes (property tax)
- Insurance (homeowner’s insurance)
Property taxes typically add $200–$800+ per month to your mortgage payment depending on location and home value. Use our home affordability calculator to see how property taxes affect what you can afford.
How to Appeal Your Property Tax Assessment
According to the National Taxpayers Union Foundation, 30–60% of properties in the United States are over-assessed. If you believe your assessed value is too high, you can appeal. The process typically involves:
- Review your assessment notice — Check for errors in square footage, lot size, number of bedrooms/bathrooms, and property type.
- Research comparable sales — Find 3–5 similar homes that sold recently in your area for less than your assessed value.
- File a formal appeal — Most jurisdictions have a 30–90 day window after assessment notices are mailed. The appeal is typically free.
- Present your case — Bring your comparable sales data to the hearing. Many appeals are resolved informally before a formal hearing.
Successful appeals typically reduce assessments by 10–25%, which can save hundreds or thousands of dollars per year.
Property Tax Deductions on Your Income Taxes
Under current tax law (post-TCJA), you can deduct state and local taxes (SALT) including property taxes up to a combined cap of $10,000 per year ($5,000 if married filing separately). According to the IRS, approximately 12% of taxpayers itemize deductions, down from 30% before the TCJA increased the standard deduction.
For more on how taxes affect your overall financial picture, see our 2026 federal tax brackets guide.
See how property taxes affect your home budget
Use our free Home Affordability Calculator →Also useful: Mortgage Calculator · How Much House Can I Afford?
Frequently Asked Questions
How do I calculate my property taxes?
Multiply your home’s assessed value by your local tax rate (mill rate). For example, if your home’s assessed value is $250,000 and your local tax rate is 1.5%, your annual property tax is $250,000 × 0.015 = $3,750. Note that assessed value is often lower than market value.
What is a mill rate?
A mill rate is the amount of tax per $1,000 of assessed property value. One mill equals $1 per $1,000. A mill rate of 20 means you pay $20 for every $1,000 of assessed value. To convert to a percentage, divide by 10: a 20-mill rate equals 2.0%.
Can I lower my property taxes?
Yes. Appeal your assessment if you believe your home is overvalued — about 30–60% of properties are over-assessed. Apply for homestead exemptions if you live in the home. Check for senior, veteran, or disability exemptions. Review your tax bill for errors in square footage or lot size.
Which state has the highest property taxes?
According to the Tax Foundation (2026), New Jersey has the highest effective property tax rate at approximately 2.23%, followed by Illinois at 2.07% and Connecticut at 1.92%. Hawaii has the lowest at just 0.27%.