How Property Tax Is Calculated: A Simple Explanation

June 12, 2025

The Simple Formula

Your property tax is calculated as:

Assessed Value × Tax Rate = Annual Property Tax

That's it. But both numbers can be confusing, so let's break them down.

Part 1: Assessed Value

Your county assessor estimates what your property is worth. This is NOT always the same as:

  • What you paid for it (purchase price)
  • What Zillow says it's worth (Zestimate)
  • What you could sell it for today (market value)

    • Some states assess at full market value. Others assess at a percentage:

  • Ohio: 35% of market value
  • South Carolina: 4% for primary residence
  • Colorado: 6.95% of actual value
  • Most states: 100% of assessed = 100% of estimated market value

    • This is where mistakes happen. If your assessor thinks your home is worth $400K but it's really worth $350K, you're overpaying by about 12%.

    Part 2: Tax Rate (Millage Rate)

    The tax rate is set by your local government (county, city, school district). It's expressed as:

  • A percentage (1.5%)
  • Mills (15 mills = 1.5%)
  • Dollars per thousand ($15 per $1,000 of assessed value)

    • These all mean the same thing. On a $300K home at 1.5%: $4,500/year.

    Multiple rates stack: Your total rate = county rate + city rate + school district rate + any special district rates. This is why two homes in the same county can have different tax bills if one is inside city limits and the other isn't.

    Why Rates Vary So Much

    Property tax rates range from 0.2% (Hawaii) to 3%+ (New Jersey, Illinois). Why?

    States that rely heavily on property tax (usually because they have no income tax):

  • Texas: 1.3-2.5% effective rate
  • New Hampshire: 1.5-2.5%
  • New Jersey: 1.8-3.0%

    • States that rely on income tax instead:

  • Hawaii: 0.2-0.3% (very low property tax because high income tax)
  • Alabama: 0.3-0.7%
  • Colorado: 0.4-0.8%

    • How to Check If You're Overpaying

    1. Find your assessed value — on your tax bill or county assessor website

    2. Compare to actual market value — check recent sales of similar homes nearby

    3. If assessed > market value — you may be overpaying

    4. File an appeal — see our guide: How to lower your property tax

    Property Tax by State

    We track effective property tax rates for every county in America. The national range:

  • Lowest: Hawaii counties (0.2-0.3%)
  • Highest: New Jersey counties (2-3%+)

    • On a $400K home, the difference between 0.3% and 2.5% = $880/year vs $10,000/year. Where you buy matters enormously.

    See property tax rates by county → | Find your county →

    Common Exemptions That Lower Your Bill

  • Homestead exemption — reduces assessed value for primary residence
  • Senior freeze — locks your tax at current level (TX, CA, FL)
  • Veteran exemption — partial or full exemption for veterans
  • Disability exemption — for qualifying conditions

    • Most people need to apply for these — they don't happen automatically. Check with your county assessor's office.

    Search your county's tax rate → | State-by-state rankings →

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