Property Tax Calculator

A $400,000 home in a county that assesses at 100% of value and charges a 1.1% rate owes about $4,400 a year in property tax - roughly $367 a month. Move that same home to a 2.1% county and the bill nearly doubles to about $8,400; drop it into a 0.5% county and it falls to around $2,000. That is the whole story of property tax in one sentence: the number is your taxable value times a local rate, and the local rate is the part that swings the most. This property tax calculator (also called a real estate tax calculator) turns your home value and your own local rate into a yearly and monthly figure you can put in a budget.

How property tax is calculated

Every property tax bill in the U.S. follows the same basic structure, even though the inputs differ by location:

First the assessor sets a market value for your home. That value is multiplied by an assessment ratio to get the assessed value - in many places the ratio is 100%, but some jurisdictions assess at a fraction such as 50% or even 10%. Any exemptions (most commonly a homestead exemption for your primary residence) are subtracted to get the taxable value. Finally the tax rate is applied. Divide the annual result by 12 for the monthly amount that typically lands in your escrow.

A worked example

Suppose your home's market value is $350,000, your county assesses at 100%, you qualify for a $25,000 homestead exemption, and the rate is 1.25%. Your assessed value is $350,000. Subtract the $25,000 exemption and the taxable value is $325,000. Apply 1.25% and the annual tax is $4,063, or about $339 a month. The exemption saved you roughly $313 a year (1.25% of $25,000). Change the rate to 1.25% expressed as 12.5 mills and you get the exact same answer - mills and percent are just two ways of writing the same rate.

Percent vs. mills (millage rates)

Counties express the rate in two ways. A percentage is the share of taxable value you owe. A mill (or millage rate) is $1 of tax per $1,000 of value, so 10 mills = 1%. A rate of 25 mills is 2.5%; a rate of 7.5 mills is 0.75%. Your tax bill might list a millage rate while a neighboring town lists a percentage - this calculator accepts either and shows you both, so you can compare apples to apples.

How to use this property tax calculator

You only need two or three numbers from your tax bill or county assessor to get a realistic estimate:

1. Home market value: enter your home's current value, the purchase price, or the market value shown by your assessor.
2. Assessment ratio: leave it at 100% unless your locality assesses at a fraction of market value, in which case enter that percentage.
3. Tax rate: switch between percent and mills to match how your bill states it, then type your local rate. Do not guess a national figure - rates vary enormously by location.
4. Exemption (optional): if you qualify for a homestead, senior, veteran or disability exemption, enter the dollar amount that comes off your assessed value.

Press Calculate property tax and read the annual and monthly figures, then check the step-by-step table to see exactly how the bill is built from market value down to the final tax.

Who this calculator is for

Anyone who needs to turn a home value into a tax number will find it useful:

• Home buyers budgeting the true monthly cost of a property before making an offer.
• Current owners sanity-checking a new assessment or estimating next year's bill.
• Sellers and agents giving prospective buyers a realistic tax estimate for a listing.
• Landlords and investors modeling carrying costs on a rental or flip.
• Anyone comparing locations where a lower price might be offset by a much higher tax rate.

Key property tax terms explained

• Market value: what your home would likely sell for; the starting point for assessment.
• Assessed value: market value times the assessment ratio - the value your county actually taxes.
• Assessment ratio: the percentage of market value used for taxation (often 100%, sometimes a fraction).
• Taxable value: assessed value minus exemptions; the figure the rate is finally applied to.
• Millage / mill rate: tax expressed per $1,000 of value (10 mills = 1%).
• Homestead exemption: a reduction in taxable value for an owner-occupied primary residence.
• Effective tax rate: your annual tax divided by market value - the best number for comparing locations.

Three scenarios that change the bill

Using a $400,000 home as the baseline, here is how common situations move the annual tax:

• Low-tax county (0.6%, 100% assessment): about $2,400 a year, or $200 a month.
• Mid-range county (1.2%, 100% assessment, $40,000 homestead exemption): taxable value $360,000, tax about $4,320 a year, or $360 a month.
• High-tax county (2.2%, 100% assessment): about $8,800 a year, or $733 a month - more than three times the low-tax case for the same home.

The takeaway: a home that looks affordable on price alone can carry very different annual costs depending on the local rate, which is why you should always plug in your own jurisdiction's numbers.

Factors that change your result the most

• Local tax rate: the biggest lever - effective rates range from under 0.4% to over 2% of value.
• Assessed value: reassessments can raise (or lower) the value every cycle, moving the bill even if the rate holds.
• Assessment ratio: a fractional ratio dramatically lowers the taxable base versus a 100% ratio.
• Exemptions: homestead, senior, veteran and disability exemptions can shave hundreds off the bill.
• Special levies: voter-approved bonds and special districts can add to the rate in some areas.

Tips to lower your property tax

• Claim every exemption: make sure your homestead exemption is on file, plus any senior, veteran or disability exemptions you qualify for.
• Review your assessment: check that your assessed value and home details (square footage, lot size, condition) are accurate.
• Appeal if over-assessed: if comparable nearby homes are valued lower, file an appeal with evidence before the deadline.
• Watch for reassessment notices: respond promptly - many jurisdictions only allow appeals within a short window.

How property tax fits your monthly housing cost

If you have a mortgage, your servicer often collects 1/12 of the annual tax each month in an escrow account and pays the county for you, which is why your monthly mortgage payment is larger than just principal and interest. The monthly figure from this calculator is the amount that flows into that escrow line. If you own your home outright, you pay the county directly, usually once or twice a year, so budget the full annual number even though it is not split into monthly bills.

Why rates differ so much from state to state

There is no national property tax in the United States - every dollar is set by counties, cities, school districts and special districts, which is why effective rates span an enormous range. In the lowest-tax states the effective rate on a typical home sits well under 0.5% of market value, while in the highest it climbs past 2%. On a $400,000 home that is the difference between roughly $2,000 and over $8,000 a year for the exact same property. States with no income tax often lean harder on property and sales taxes to fund services, and within a single state two neighboring towns can diverge sharply because each layers its own school and municipal levies on top. The practical lesson is that a "national average" is almost useless for budgeting: pull the rate straight from your tax bill or your county assessor's website and enter that. If you are weighing two areas, compare the effective rate (annual tax divided by market value) rather than the headline price, because a cheaper house in a high-rate county can cost more to hold than a pricier house in a low-rate one. The same logic applies when you fold the tax into a full payment with the mortgage calculator or test your budget ceiling with the home affordability calculator.

When and how property tax is billed

How often you pay depends entirely on your jurisdiction. Many counties send a single annual bill, commonly in the fall or winter; others split it into two installments a few months apart, and some bill quarterly. If you have an escrowed mortgage, your servicer collects roughly 1/12 of the annual amount each month and pays the county on those dates for you - so a once-a-year bill still smooths into your monthly payment. Two practical things to watch: an escrow shortage can occur when your assessment or rate rises mid-cycle, and the servicer makes up the gap by raising your monthly escrow the following year (sometimes with a lump-sum catch-up). And if you pay the county directly, missing an installment date triggers interest and penalties quickly, so set a reminder for each due date. The monthly figure this calculator shows is the steady amount to set aside (or verify against your escrow line); the annual figure is what the county actually wants by its deadline.

What to do when your assessment jumps

A reassessment notice that raises your home's value can push your bill up sharply even if the rate never changes. Before you accept it, work through a short checklist. First, read the notice carefully - it states the new value and, crucially, the deadline to appeal, which is often only a few weeks. Second, check the property record the assessor used: errors in square footage, bedroom or bathroom count, lot size, or condition are common and directly inflate value. Third, gather comparables - recent sale prices of similar nearby homes that support a lower value than the assessor assigned. Fourth, file the appeal with that evidence before the deadline; many jurisdictions let you do this online or by mail at no cost, and a successful appeal lowers your taxable value for years, not just one cycle. Finally, confirm every exemption you qualify for is actually on file - a homestead, senior, veteran or disability exemption that lapsed or was never applied is money left on the table. Even if the rate is fixed, controlling the assessed value is the part of the bill you have the most influence over.

Limitations and assumptions

This is a planning estimate, not an official assessment. Keep these limits in mind:

• It uses a single combined rate; real bills may stack county, city, school and special-district rates that you should sum into one figure here.
• It does not model assessment caps, phase-ins or mid-year reassessments that some states apply.
• It treats the exemption as a flat dollar reduction in taxable value; percentage-based or tiered exemptions need to be converted to a dollar amount first.
• It does not include special assessments for sidewalks, sewers or improvement districts.
• Your actual bill depends on your assessor's value and your jurisdiction's rules - confirm with your county for exact figures.

How it compares to related calculators

This page answers "what is my property tax on this home?" If your question is different, a sister tool fits better:

• To fold property tax into a full monthly payment with principal, interest, insurance and PMI, use the Mortgage Calculator.
• To see how much home you can afford given taxes and other costs, use the Home Affordability Calculator.
• To plan a savings target for your down payment, use the Down Payment Calculator.
• To generate a full payment-by-payment loan schedule, use the Amortization Calculator.
• To compare your current loan against a new one, use the Refinance Calculator.

Sources

• Internal Revenue Service (IRS) - Topic No. 503, Deductible Taxes (state and local property tax, SALT cap).
• Consumer Financial Protection Bureau (CFPB) - What is an escrow or impound account?
• U.S. Census Bureau - Property taxes by state and county data.