Property Tax Calculator

Property tax is one of the most significant annual costs of owning real estate. It is levied by local governments—cities, counties, municipalities, or special districts—on the assessed value of land and improvements. The revenue generated typically funds public services such as schools, roads, emergency services, and local infrastructure.

Because property tax rates and rules vary enormously from one jurisdiction to another, this calculator is intentionally generic. You enter the assessed value of your property, your local tax rate (as either a percentage or a millage rate), and any applicable exemptions. The calculator then estimates your annual tax liability, the monthly equivalent, and the effective tax rate after exemptions.

How Property Tax Is Calculated

The core formula for property tax is straightforward: multiply the taxable value of the property by the applicable tax rate. The taxable value is usually the assessed value minus any exemptions or deductions you qualify for.

Taxable Value = Assessed Value − Exemptions

Annual Tax = Taxable Value × Tax Rate

The tax rate is most commonly expressed in one of two ways: as a plain percentage (e.g., 1.2%, meaning you pay 1.20 per 100 of taxable value) or as a millage rate (e.g., 12 mills, meaning you pay 12 per 1,000 of taxable value). A millage rate of 10 mills equals 1%. This calculator supports both formats—select the rate type that matches how your jurisdiction expresses its rate.

What Is the Assessed Value?

The assessed value is the value placed on your property by a government assessor for the purpose of calculating property tax. It may or may not equal the market value (the price you could sell the property for). Some jurisdictions assess properties at full market value; others assess at a fraction of market value, called the assessment ratio.

For example, a jurisdiction might assess properties at 80% of market value, meaning a property worth 400,000 on the open market would have an assessed value of 320,000 for tax purposes. If your jurisdiction uses an assessment ratio other than 100%, you may need to apply that ratio to your market value before entering the number into this calculator.

Assessed values are typically updated periodically—annually in some places, less frequently in others—by the local assessor's office. You can usually find your property's current assessed value on your annual property tax bill, your jurisdiction's online property records, or by contacting your local assessor.

Understanding Millage Rates

A mill is one-thousandth (1/1,000) of a currency unit. A millage rate, also called a mill rate, expresses the amount of tax owed per 1,000 of assessed (or taxable) value. For example, a mill rate of 15 mills means you owe 15 for every 1,000 of taxable value, or equivalently, 1.5% of taxable value.

Millage rates are commonly used in the United States and several other countries. If your property tax bill or local government website lists the tax rate in mills, select the 'Millage (mills)' option in this calculator and enter the rate as a number of mills. The calculator converts the millage rate to an equivalent percentage internally.

The conversion is simple: mills ÷ 10 = equivalent percentage rate. A mill rate of 20 mills equals 2.0%. If you are unsure whether your rate is expressed as a percentage or in mills, a clue is the magnitude: typical residential property tax rates are between 0.5% and 3% (5 to 30 mills), so a rate of '12' is almost certainly 12 mills (1.2%), not 12%.

Exemptions and Deductions

Many jurisdictions offer property tax exemptions or deductions that reduce the taxable value of your property, thereby reducing the amount of tax owed. Common examples include homestead exemptions (for properties used as a primary residence), senior citizen exemptions, veteran exemptions, disability exemptions, and agricultural exemptions.

An exemption amount is subtracted from the assessed value before applying the tax rate. For instance, if your assessed value is 250,000 and you qualify for a homestead exemption of 25,000, your taxable value is 225,000, and the tax is calculated on 225,000 rather than the full assessed value.

In this calculator, enter the total dollar amount of all exemptions and deductions you qualify for. If no exemptions apply, leave the field at zero. The 'Taxable Value' output shows the assessed value after exemptions, confirming how much of your property's value is actually being taxed.

Effective Tax Rate

The effective tax rate is the annual tax expressed as a percentage of the full assessed value (before exemptions). It represents the true burden of property tax relative to the total value of the property and is a useful metric for comparing properties in different locations or with different exemption levels.

Effective Rate (%) = Annual Tax / Assessed Value × 100

Because exemptions reduce the taxable base but the effective rate is calculated against the full assessed value, properties with large exemptions will show a lower effective rate than the nominal rate. This allows you to compare the real tax burden across different scenarios or jurisdictions regardless of whether exemptions apply.

Why Property Tax Rates Vary

Property tax rates differ widely depending on the location and the government entities that levy them. In many places, the total rate you pay is the sum of several overlapping rates from different taxing bodies—the city or county, the school district, a fire district, a library district, and so on. Each entity sets its own levy, and the rates are combined on your tax bill.

Beyond the rate, the assessed value can also differ significantly between jurisdictions due to different assessment ratios, how frequently assessments are updated, and local policies on how quickly assessed values can increase. This means that comparing nominal tax rates across jurisdictions without accounting for assessment practices can be misleading.

Some jurisdictions also have alternative calculation mechanisms such as caps on annual increases to assessed value, special assessment zones, or split-rate taxes that apply different rates to land and improvements. This calculator does not model these special cases—it applies a single uniform rate to the taxable value you enter.

Monthly Equivalent and Budget Planning

Property taxes are typically billed annually or semi-annually, but for budgeting purposes it is useful to know the monthly equivalent. If you pay your property tax through an escrow account as part of your mortgage payment, the lender typically collects one-twelfth of the estimated annual tax each month.

Monthly Tax = Annual Tax / 12

The monthly figure output by this calculator can help you estimate your total monthly housing cost more accurately by adding it to your mortgage principal and interest, homeowner's insurance, and any HOA fees. It also helps you verify that the escrow amount your lender is collecting is consistent with your actual tax liability.

Using This Calculator

Enter the assessed value of your property as shown on your tax bill or assessor records. Select whether your local tax rate is expressed as a percentage or in mills, then enter the rate. Enter any applicable exemption amounts (or 0 if none apply). The calculator will display your estimated annual tax, monthly tax equivalent, taxable value after exemptions, and the effective rate.

To find your property's assessed value and applicable rate, check your most recent property tax bill, your local county or municipal assessor's website, or contact your local tax assessor's office directly. Rates can change annually when local budgets are adopted, so use the most current rate available.

This calculator is for informational and planning purposes. Results are estimates based solely on the inputs you provide. They do not account for special assessments, split rates, tax abatements, deferred taxes, or other jurisdiction-specific rules. Consult your local tax authority or a qualified tax professional for guidance specific to your property.