Property Tax Estimator

• Converts an annual property tax estimate into the monthly escrow amount most mortgage payments actually include.
• Accounts for a lower assessment ratio, common in states that assess homes at less than full market value.
• Models a homestead or other flat-dollar exemption, if your area offers one.
• Shows how the bill changes across a range of tax rates, since local rates vary so widely.

How to use this calculator

Enter the home's market value and the effective property tax rate for the area — most county assessor or tax collector websites publish this as a percentage of assessed value. If the state assesses homes at less than full market value, enter that assessment ratio under Advanced; leave it at 100% if unsure. Add a homestead or other flat exemption amount if one applies.

The result shows the estimated annual bill and, since most mortgage payments collect property tax monthly through an escrow account, the monthly amount that implies.

How the estimate works

The calculation applies the tax rate to the assessed value, not necessarily the full market value:

Assessed value = home value × assessment ratio
Taxable value = assessed value − exemption
Annual tax    = taxable value × tax rate

In states that assess at 100% of market value with no exemptions, this simplifies to just the market value times the rate. Many states use a lower assessment ratio, a capped annual increase in assessed value, or both — those mechanics are why an assessed value on a tax bill can look very different from a home's actual resale value.

A worked example

A $350,000 home in an area with a 1.1% effective tax rate and full (100%) assessment, no exemption, works out to about $3,850 a year, or roughly $321 a month if collected through escrow. The same home in a state that assesses at 80% of market value would have an assessed value of $280,000, bringing the bill down to about $3,080 a year at the same rate — assessment ratio matters as much as the headline rate.

Why property tax rates vary so much

Property tax typically funds several overlapping local authorities at once — a county, a school district, a city or township, and sometimes special districts for things like fire protection or water management — each levying its own portion. That's why two homes of similar value, even a short distance apart, can have noticeably different tax bills if they sit in different combinations of those districts. States also differ sharply in how much they rely on property tax versus income or sales tax to fund local government, which shows up directly in the base rate.

Assumptions and limitations

• Uses one flat rate for the whole bill. Real tax bills are often the sum of several separate levies (county, school, city, special districts) that can each change independently.
• Doesn't model reassessment. Assessed value is held constant here; most jurisdictions reassess periodically, and some cap how fast assessed value can rise even when market value jumps.
• Doesn't model exemptions beyond one flat-dollar amount. Senior, veteran, and disability exemptions often work differently (a percentage, a rate freeze, or an income-based test) than a simple dollar reduction.

Common mistakes

Using the previous owner's tax bill to estimate a new one. Many areas reassess a property at purchase price when it sells, which can raise the bill substantially above what the seller was paying — especially in a state with assessment caps that had kept the seller's bill artificially low for years.

Forgetting property tax when comparing monthly payments across homes. A cheaper home in a higher-tax area can end up with a similar or higher total monthly payment than a pricier home in a lower-tax one — the full monthly cost, not just principal and interest, is what actually matters for budgeting.

Assuming the rate is fixed. Local tax rates and assessed values can both change year to year as budgets and property values shift — an escrow account is typically re-analyzed annually and adjusted up or down to match.

Frequently asked questions