Property Tax Estimator
Estimate annual and monthly property tax based on your home's assessed value and local tax rate.
What this calculator does
This property tax estimator turns a home value and a tax rate into the annual and monthly cost. Enter the home or assessed value and your local property tax rate, and it returns the annual bill, the monthly amount your escrow account will collect, and the effective rate as a check on the arithmetic.
The monthly figure is the one that changes how a home purchase feels. Buyers focus on principal and interest, then discover the escrow portion adds several hundred dollars. In a two percent county, property tax on a mid-priced home can exceed what the same buyer would pay for a car — it is a permanent cost that never amortizes away and rises with assessments.
When to use it
Use it while comparing homes across county or municipal lines, where the same price can carry wildly different tax bills. In metro areas that span several jurisdictions, two houses ten minutes apart at the same price can differ by $300 a month in tax alone, which is worth more than most buyers' negotiating gains.
It is also the tool for checking a listing's tax figure, which usually reflects the seller's assessment rather than what you will pay after reassessment. And it quantifies whether an assessment appeal is worth pursuing: run your current assessed value and the value you believe is correct, and the annual difference tells you what an afternoon of gathering comparables is worth — repeated every year you own the home.
Understanding the inputs
Home or assessed value should be the figure your county actually taxes. Many jurisdictions assess at full market value, but others use an assessment ratio — 40 percent in parts of Georgia, for example — in which case entering market value with the nominal millage rate will overstate the bill dramatically.
Property tax rate should be the combined rate across every taxing body: county, city, school district, and any special assessment districts for fire, library, or water. School levies are usually the largest single component. The county treasurer or assessor publishes the combined rate for each parcel, and it is worth pulling the actual figure for the specific address rather than using a county average.
How is this calculated?
Annual Property Tax = Home Value × (Tax Rate / 100). Monthly = Annual / 12.
A worked example
Take a $425,000 home in a county with a combined rate of 1.35 percent. The annual bill is $5,737.50 and your servicer will collect about $478 a month into escrow — on top of principal and interest, insurance, and any HOA dues.
The geography matters more than the price. The same house in a New Jersey township at 2.23 percent would cost $9,478 a year, or $790 a month; in Hawaii at 0.28 percent it would cost $1,190 a year, under $100 a month. That $690 monthly spread is equivalent to about $109,000 of mortgage at 6.5 percent. If the property qualified for a $50,000 homestead exemption at the 1.35 percent rate, the bill would fall to $5,062.50 — a $675 annual saving for filing one form.
Limitations and assumptions
This is a flat multiplication and does not model exemptions, assessment caps, special assessments, or the reassessment that follows a sale in many states. Any of those can move the real bill by twenty percent or more in either direction, and reassessment in particular means a listing's stated tax figure is often nothing like what a new owner will pay.
Rates also change annually as taxing districts set budgets, and assessments are revised on their own cycle, so an estimate is a snapshot rather than a forecast. Special assessment districts for infrastructure, and Mello-Roos-style community facilities charges in some states, can add substantially and are not proportional to value. Pull the actual tax record for the specific parcel from the county assessor before making an offer, and ask how reassessment on sale is handled locally.
Common Questions
- How much do property tax rates vary by state?
- By roughly a factor of eight. New Jersey averages around 2.2 percent of value and Illinois close to two percent, while Hawaii sits near 0.3 percent and Alabama near 0.4. On a $425,000 home that is the difference between roughly $9,500 and $1,200 a year — comparable to a $700 monthly swing in your mortgage payment.
- What is the difference between assessed and market value?
- Assessed value is what the county uses for taxation and is often a fixed percentage of market value — sometimes 100 percent, sometimes 40 or 50. This calculator assumes they are equal, so if your county assesses at a fraction of market value, enter the assessed figure and the corresponding rate together.
- What is a homestead exemption?
- A reduction in taxable value for an owner-occupied primary residence, ranging from a few thousand dollars to fifty thousand or more depending on the state. Florida exempts up to $50,000, which at a 1.35 percent rate saves about $675 a year. Most require an application, and many homeowners never file one.
- Can my taxes rise faster than my home's value?
- Yes, because the millage rate and the assessment move independently. A district can raise the rate even in a flat market. Conversely, some states cap annual assessment increases for owner-occupiers — Florida's Save Our Homes limits them to three percent or CPI, and California's Proposition 13 to two percent.
- What happens to my taxes when I buy?
- In many states the property is reassessed at your purchase price, which can raise the bill sharply above what the seller was paying. Never budget from the seller's tax figure on a listing. Check with the county assessor how reassessment works locally and what your bill would be at your purchase price.
- How do property taxes reach my mortgage payment?
- Through escrow. Your servicer collects one twelfth of the annual bill each month, holds it, and pays the county when due. When the bill rises, your escrow account runs short and the servicer both raises the monthly collection and bills you for the shortfall — which is why payments jump unexpectedly.
- Are property taxes still deductible?
- Only within the SALT cap, which limits the combined deduction for state and local income, sales, and property taxes. Combined with a high standard deduction, most homeowners get no federal benefit from property taxes at all. It matters mainly for itemizers in high-tax states, and even there the cap bites quickly.
- Can I appeal my assessment?
- Yes, and it is worth doing when comparable homes are assessed lower or the record has your square footage or bed count wrong. Appeal windows are short — often thirty to forty-five days after the notice — and require comparable evidence. Successful appeals commonly reduce assessments five to fifteen percent, and the saving repeats annually.
- What other exemptions might I qualify for?
- Most states offer reductions for people over 65, disabled veterans, surviving spouses, and agricultural or conservation use. Some are substantial — several states exempt totally disabled veterans from property tax entirely. These almost always require an application to the county assessor and are not applied automatically.
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