Property Tax Calculator: How It Works & How to Lower Your Bill (2026)

How Property Taxes Are Calculated

Property taxes fund local schools, emergency services, roads, and public infrastructure. Every county in the U.S. levies them, but the mechanics differ by jurisdiction. The core formula is always the same:

Assessed Value × Mill Rate ÷ 1,000 = Annual Property Tax

A millis one-tenth of one cent — $1 per $1,000 of assessed value. If your county levies 15 mills and your home is assessed at $350,000:

$350,000 × 15 ÷ 1,000 = $5,250 per year

Most jurisdictions bundle multiple mill rates together: one for the county, one for the school district, sometimes one for a fire or library district. Your final bill is the sum of all levies. Use our Property Tax Calculator to add them up automatically.

Assessed Value vs. Market Value

Market value is what your home would sell for today. Assessed value is the figure the tax authority officially uses — and the two often diverge. Many counties apply an assessment ratio, a fixed percentage of market value. If a county assesses at 80% and your home is worth $400,000, your assessed value is $320,000 for tax purposes.

Some states assess at 100% of market value (called “full value assessment”), while others use ratios as low as 10%. Check your county assessor's website to confirm which ratio applies to your property before running the numbers.

Key Statistics on U.S. Property Taxes

Property taxes are the single largest source of revenue for local governments. The data reveals just how much variation exists across state lines:

• National average effective rate: 0.99%of market value (Tax Foundation). On a median-priced U.S. home of roughly $412,000, that's approximately $4,079 per year.
• $711 billion collected annuallyacross all U.S. jurisdictions, per the U.S. Census Bureau's 2022 State and Local Government Finance survey.
• Average annual single-family bill: $4,062 in 2023, with total levies of $363.3 billion on 89+ million single-family homes, according to the ATTOM 2023 Property Tax Report.
• 30–60% of properties are over-assessed, according to the Lincoln Institute of Land Policy, largely because assessments lag behind market corrections and are updated infrequently.
• Fewer than 3% of homeowners appeal their assessments annually, yet success rates often exceed 40% for those who do, per the National Taxpayers Union Foundation.

Top 5 Highest and Lowest Property Tax States (2024)

The Tax Foundation's analysis of effective property tax rates — taxes paid as a percentage of home market value — shows a dramatic national spread. Where you live matters enormously.

5 Highest Effective Property Tax Rate States

5 Lowest Effective Property Tax Rate States

Low rates don't always mean low bills. Hawaii's 0.27% rate still produces a median bill near $2,000 because home values are among the nation's highest. Conversely, Alabama's combination of low rates and modest home prices results in some of the country's smallest absolute tax bills.

Property Tax Exemptions That Can Reduce Your Bill

Exemptions reduce your taxable assessed value directly. Most require a separate application through your county assessor and are not applied automatically — which means thousands of eligible homeowners leave money on the table every year.

Homestead Exemption

Available in most states for owner-occupied primary residences. It removes a flat dollar amount or percentage from assessed value. Texas exempts $100,000 from school district taxes; Florida exempts the first $25,000 of assessed value from all taxes and an additional $25,000 from non-school levies; California's Proposition 13 caps annual assessment increases at 2% until the property changes hands.

Senior Citizen Exemptions and Freezes

Most states offer relief for homeowners aged 65 or older, often with an income cap. Illinois' Senior Citizens Assessment Freeze locks your assessed value at a base year. Texas lets seniors permanently freeze their school district taxes at the rate from the year they turned 65. Some states use circuit breaker credits that cap taxes as a percentage of income.

Veteran and Disabled Veteran Exemptions

All 50 states provide some form of property tax relief for veterans. Benefits range from modest partial exemptions to full tax waivers for 100% service-connected disabled veterans in states like Texas, Florida, and Michigan. Active-duty servicemembers may qualify for additional protections under the Servicemembers Civil Relief Act.

Disability Exemptions

Homeowners with qualifying disabilities can claim exemptions in most jurisdictions. New York's “STAR Enhanced” program provides additional relief for seniors with disabilities. Documentation from a physician or the Social Security Administration is typically required when applying.

The SALT Deduction Cap and Your Property Taxes

Before 2018, homeowners could deduct the full amount of their state and local taxes — including property taxes — from their federal taxable income. The Tax Cuts and Jobs Act (TCJA) of 2017 changed that dramatically.

Starting in 2018, the combined deduction for state income taxes and property taxes (the SALT deduction) was capped at $10,000 per year for individuals and married couples filing jointly. The cap is scheduled to expire after 2025, though Congress has discussed whether to extend or modify it.

For homeowners in high-tax states like New Jersey (average property tax bill: ~$9,479) or Illinois (~$5,765), the $10,000 SALT cap means most of their property tax bill provides zero additional federal tax benefit. This has effectively increased the after-tax cost of homeownership in high-tax states — one reason many high earners have relocated to lower-tax states since 2018.

How Escrow Accounts Work for Property Taxes

Most homeowners with a mortgage never write a check directly to their county for property taxes. Instead, the lender handles it through an escrow account.

Each month, your mortgage servicer collects 1/12th of your estimated annual property tax bill (plus 1/12th of your homeowners insurance premium) along with your principal and interest payment. This money sits in an escrow account until the tax due date, at which point the servicer pays the county on your behalf.

If your property taxes increase — due to a reassessment, a new levy, or an expiring exemption — your servicer will recalculate the escrow requirement and adjust your monthly payment. This is why your mortgage payment can rise even if your interest rate hasn't changed. For a detailed breakdown of how mortgage payments are structured, see our Mortgage Calculator guide.

4 Signs Your Home Is Over-Assessed

1. Your assessed value exceeds recent comparable sales.Look up 3–5 similar homes that sold within the past 6 months. If they closed for less than your assessed value, you likely have a strong case.
2. Your property record card has errors. Assessors work from public records, which sometimes list the wrong square footage, number of bedrooms, or lot size. A 200 sq ft discrepancy can translate to hundreds of dollars in excess taxes annually.
3. Your assessment rose sharply in a single year.If local market conditions don't support the jump, the assessor may have relied on flawed data or a flawed mass appraisal model.
4. Neighbors with similar homes pay significantly less. County property records are public. Significant disparities between comparable adjacent properties are textbook grounds for appeal.

How to Appeal Your Property Tax Assessment: 5 Steps

Winning an appeal doesn't require a lawyer. Most counties handle informal reviews first, and formal hearings are straightforward if you arrive prepared with the right documentation.

1. Review your assessment notice promptly. Appeal windows are typically 30 to 90 days from the notice date. Missing the deadline forfeits your right to appeal for that tax year.
2. Request your property record card.Ask the assessor's office for the data used to calculate your value. This document lists your home's recorded characteristics: size, age, condition, and features. Check every line for errors.
3. Gather comparable sales (comps).Find 3–5 homes of similar size, age, and location that sold within the past 6–12 months for less than your assessed value. Zillow, Redfin, and your county recorder's website are free starting points.
4. Request an informal review first.Many counties allow you to call or meet with an assessor before filing a formal appeal. If they agree you're over-assessed, they may adjust your value without a formal hearing.
5. File the formal appeal if needed.Submit your appeal to the county's Board of Equalization or Assessment Review Board. Fees are typically $0–$50. Bring printed comps, photos of your property, and documentation of any defects. Focus on comparable sales data — boards respond to numbers, not hardship stories.

5 Ways to Lower Your Property Tax Bill

1. Apply for every exemption you qualify for.Homestead, senior, veteran, and disability exemptions are frequently unclaimed. Visit your county assessor's site and review the exemption list each year — requirements and deadlines change.
2. Appeal your assessment.If your home is over-assessed — and roughly a third of U.S. properties are — a successful appeal reduces your bill permanently. The process is free in most counties, and success rates for well-prepared appeals often exceed 40%.
3. Avoid pulling permits for minor cosmetic work.Permitted additions increase assessed value. For small projects that legally don't require permits, you're not obligated to trigger a reassessment.
4. Don't let the assessor inside without cause.You're generally not required to grant access for interior inspections. If the assessor can't verify improvements, they may leave them off the record.
5. Review your bill for calculation errors. Even if your assessed value is correct, tax authorities can misapply exemptions or make arithmetic errors. Verify the math on your bill every year.

Thinking about how property taxes affect the total cost of homeownership? See our guides on how much house you can afford and rent vs. buy decision-making for a fuller picture.

Frequently Asked Questions

How is property tax calculated?

Property tax is calculated using the formula: Assessed Value × Mill Rate ÷ 1,000 = Annual Tax. A home assessed at $350,000 with a 15 mill rate owes $5,250 per year. Your assessed value may differ from market value depending on your jurisdiction's assessment ratio — some counties assess at 80% of market value, others at 100%.

What is the average property tax rate in the United States?

The national average effective property tax rate is approximately 0.99% of a home's market value, according to Tax Foundation data. That means a $400,000 home pays roughly $3,960 per year on average. Rates range from 0.27% in Hawaii to 2.23% in New Jersey — a more than 8× spread from lowest to highest.

What is a homestead exemption and how much does it save?

A homestead exemption reduces the taxable assessed value of your primary residence. Texas exempts $100,000 from school district taxes; Florida exempts up to $50,000; California caps annual assessment increases at 2% under Prop 13. Savings range from a few hundred to several thousand dollars annually, depending on where you live and your home's value.

How do I appeal my property tax assessment?

Request your property record card from the assessor's office and check for errors in square footage, bedroom count, or lot size. Gather 3–5 comparable recent sales showing lower values. File a formal appeal by your county's deadline — typically 30–90 days after assessment notices go out — then attend the hearing with your evidence. Most hearings take less than 30 minutes.

What is the difference between assessed value and market value?

Market value is what your home would sell for today. Assessed value is what the tax authority uses to calculate your bill — often a fixed percentage of market value called the assessment ratio. If your county uses an 80% ratio and your home is worth $400,000, your assessed value is $320,000. The ratio varies widely by state and even by county within a state.

Can seniors get a lower property tax rate?

Yes. Most states offer senior exemptions, assessment freezes, or circuit breaker credits for homeowners aged 65 or older who meet income requirements. Illinois's Senior Citizens Assessment Freeze locks assessed value at a base year. Texas lets seniors permanently freeze their school district tax rate once they turn 65. Check your state's department of revenue for current eligibility rules.

How does the SALT deduction cap affect property taxes?

The Tax Cuts and Jobs Act of 2017 capped the SALT deduction at $10,000 per year through 2025. Homeowners in high-tax states like New Jersey and Illinois — where annual property tax bills routinely exceed $10,000 — can only deduct $10,000 of their combined state income and property taxes, leaving the excess with no federal tax benefit. This effectively raised the after-tax cost of owning property in high-tax states.