Why do property tax rates vary so much between states?

Property tax is a local government tax, not a federal tax. Rates are set by counties, municipalities and school districts to fund local services -- primarily public schools, emergency services and local infrastructure. States with high property taxes (New Jersey, Illinois, Texas) often have no or low state income tax, or have significant local government spending requirements. States with low property taxes (Hawaii, Alabama, Louisiana) tend to fund local services through other means such as sales tax or state income tax.

What is the SALT deduction cap and does it affect me?

The State and Local Tax (SALT) deduction allows federal taxpayers to deduct up to $10,000 in combined state income taxes and property taxes. The cap was introduced by the 2017 Tax Cuts and Jobs Act and is currently scheduled to expire after 2025. If your combined state income tax and property tax exceeds $10,000, the excess provides no federal tax benefit. This particularly affects higher-income earners in high-tax states like New Jersey, Connecticut, New York and California.

Is property tax included in my mortgage payment?

Usually yes. Most lenders require an escrow account where 1/12 of the estimated annual property tax (and homeowners insurance) is added to each monthly mortgage payment. The lender then pays the tax bill directly to the county when it is due. This is called PITI -- Principal, Interest, Tax and Insurance. If your property tax increases, your escrow payments (and therefore monthly mortgage payment) will increase at the next annual escrow review.

US Property Tax Estimator — Free Real Estate Calculator

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US buyer is comparing properties in two different counties and wants to know which has the lower property tax burden before they decide which suburb to focus on. They also want to know if they hit the SALT cap.

US Property Tax Estimator

Tax

Land value ($)

Unimproved land value (from council rates notice)

State

Property type

Land tax applies to investment and holiday properties — not your primary residence.
Thresholds (approx 2024): NSW $1.075M · VIC $300K (2024 threshold) · QLD $600K · WA $300K · SA $723K · TAS $25K · ACT (varies)
Rates are applied progressively above the threshold. Foreign owners face additional surcharges in most states.

Reference: Revenue NSW — Land Tax

ℹ️ Results are estimates for planning purposes. Verify with current standards and a qualified professional.

1 What this calculator does

Estimates annual and monthly US property tax from assessed home value and state average effective property tax rate. Shows whether the estimate exceeds the $10,000 SALT deduction cap. Allows comparison across states with different effective tax rates.

2 Formula & professional reasoning

Annual property tax = Assessed value x Effective tax rate (%)
Monthly property tax = Annual tax / 12
SALT deduction: Capped at $10,000 (combined state income tax + property tax)
Effective rate = Total tax / Assessed value x 100

Property tax in the US is levied by local governments (counties, municipalities, school districts) and varies enormously by location -- from 0.27% in Hawaii to 2.4%+ in New Jersey and Illinois. The assessed value used for tax purposes may be the full market value or a percentage of it (the assessment ratio) depending on the jurisdiction. The SALT deduction cap ($10,000 for married filing jointly and singles) means high-property-tax states effectively cost more after federal tax for higher-income owners.

3 Worked examples

⚠️ Illustrative example only — not clinical or professional instruction.

Basic

California -- low effective rate, high value

Given: Assessed value: $750,000 | State: California (0.73% effective rate)

Working: Annual tax: $750,000 x 0.0073 = $5,475 | Monthly: $456 | SALT check: $5,475 < $10,000 cap

Answer: Annual tax: $5,475 | Monthly: $456 | Under SALT cap: fully deductible

💡 California has Proposition 13 limiting annual increases to 2%. Base rate is 1% of purchase price plus local assessments averaging 0.73% effective rate overall.

Standard

New Jersey -- high tax state

Given: Assessed value: $580,000 | State: New Jersey (2.21% effective rate)

Working: Annual tax: $580,000 x 0.0221 = $12,818 | Monthly: $1,068 | SALT check: $12,818 > $10,000 cap

Answer: Annual tax: $12,818 | Monthly: $1,068 | Exceeds $10,000 SALT cap: $2,818 not deductible

💡 New Jersey has the highest effective property tax rate in the US. At $12,818 the homeowner loses $2,818 of deductions above the SALT cap. Combined with high NJ income tax, most NJ homeowners are well above the $10,000 SALT cap.

Advanced

Comparing two states for the same budget

Given: $500,000 home in Illinois (2.07%) vs $500,000 in Florida (0.80%)

Working:

Illinois: $500,000 x 0.0207 = $10,350/yr = $863/mo | Florida: $500,000 x 0.008 = $4,000/yr = $333/mo | Difference: $6,350/yr

Answer: Illinois: $10,350/yr | Florida: $4,000/yr | Florida saves $6,350/yr ($529/month)

💡 Over 30 years, the property tax difference between Illinois and Florida is $190,500 at current rates -- a significant consideration for those choosing where to buy a retirement or vacation home.

4 Sanity check

State effective property tax rates (2024 approx)

NJ 2.21% | IL 2.07% | CT 1.79% | NH 1.77% | TX 1.60% | NY 1.40% | OH 1.51% | CA 0.73% | FL 0.80% | TX 1.60% | HI 0.27%

These are statewide averages -- individual county rates vary significantly within states.

SALT deduction cap (2017 Tax Cuts and Jobs Act)

$10,000 combined state income tax + property tax for married filing jointly | $10,000 single | Scheduled to expire after 2025 unless extended

High-income households in high-tax states lose significant federal deductions due to the cap.

Assessed value vs market value

Some states assess at 100% of market value | Others at 50-85% of market value | Effective rate accounts for this difference

Always use the assessed value shown on your tax bill, not the full market value, if calculating actual tax.

Homestead exemption

Most states offer a homestead exemption reducing assessed value for primary residences | Typically $25,000-$100,000 reduction | Not available for investment properties

5 Common errors

Error	Cause	Consequence	Fix
Using market value instead of assessed value	Treating the Zillow estimate as the tax assessment basis	Property tax estimated incorrectly -- can be 15-40% different from actual	Use the assessed value shown on your annual tax bill or county assessor's website. Many counties assess at less than 100% of market value.
Not accounting for homestead exemptions	Calculating tax on full assessed value without the owner-occupier exemption	Tax overstated for primary residences	Primary residence homestead exemptions typically reduce the assessed value by $25,000-$100,000. Apply the relevant state exemption if this is an owner-occupied property.
Treating property tax as fully deductible on federal taxes	Not considering the $10,000 SALT cap	Incorrectly assuming full property tax deduction reduces federal tax	For 2024 (and likely through at least 2025), total state and local tax deductions are capped at $10,000 per return. Property tax above this amount (combined with state income tax) is not deductible.
Not comparing effective rates when evaluating different counties	Comparing quoted mill rates without understanding the assessment ratio	A lower mill rate county may have a higher effective rate if it assesses at a higher percentage of market value	Always compare the effective property tax rate (total annual tax / market value x 100) rather than the nominal mill rate to compare across jurisdictions.

6 Reference & regulatory links

🇦🇺 Australia

🇺🇸 United States

7 Professional workflow

Common tools used alongside this one:

🛡️

PMI Calculator

PMI and property tax are the two major ongoing costs unique to US mortgage homeownership -- run both calculators when evaluating affordability

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Mortgage Affordability Calculator

Include estimated monthly property tax (from this calculator) in the monthly expenses field of the Mortgage Affordability Calculator

→

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Landlord Cash Flow Calculator

For US investment properties, property tax is a major fixed annual cost that belongs in the Landlord Cash Flow monthly expenses

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Input	Result
Lowest rates	HI 0.27% \| AZ 0.62% \| AL 0.41%
Highest rates	NJ 2.21% \| IL 2.07% \| CT 1.79%
SALT cap	$10,000 combined for all filers
Homestead exemption	Reduces assessed value for primary residence