Property taxes are the largest ongoing cost of owning a home for many people, and they fund local schools, roads, and services. Yet the way they are calculated confuses most owners. The bill comes from two moving parts: how much your home is assessed for and the rate applied to that value.

Assessed value versus market value

A local assessor estimates a value for your property, which may differ from what it would actually sell for. Some jurisdictions assess at full market value, while others apply an assessment ratio, taxing only a fraction of market value. Assessments are updated on a schedule that varies by area, from every year to every several years. Because your tax bill starts with this number, an inflated assessment directly raises what you owe.

How the rate is applied

The tax rate is often quoted as a millage or mill rate, where one mill equals one dollar of tax per 1,000 dollars of assessed value. A rate of 20 mills is 2 percent of assessed value. Multiply the taxable assessed value by the rate to get the annual bill. Local rates combine levies from overlapping authorities such as the county, city, and school district, which is why two nearby homes can face different totals.

Exemptions that lower the bill

Many places offer exemptions that reduce the taxable value before the rate is applied. A homestead exemption for a primary residence is the most common, and others exist for seniors, veterans, and people with disabilities. Some states also cap how fast the taxable value can rise each year, protecting long-time owners from sudden spikes. Applying for every exemption you qualify for is one of the few ways to directly cut the bill.

Paying through escrow and appealing

Most owners with a mortgage pay property taxes monthly into an escrow account, and the lender remits the bill when due. If your assessment seems too high, you can usually appeal by presenting comparable sales or errors in the property record. Successful appeals lower the assessed value and therefore future bills. Deadlines to appeal are strict, so it pays to review the assessment notice when it arrives.

A home assessed at 250,000 dollars in an area with a 25-mill rate would owe 6,250 dollars a year before exemptions. A 40,000 dollar homestead exemption drops the taxable value to 210,000 dollars, cutting the bill to 5,250 dollars, a 1,000 dollar annual saving.

Key takeaways

  • Your bill equals taxable assessed value multiplied by the local tax rate.
  • One mill is one dollar of tax per 1,000 dollars of assessed value.
  • Exemptions like the homestead exemption reduce taxable value if you apply.
  • You can appeal an assessment you believe is too high, but deadlines are firm.

Common mistakes

FAQ

Why did my property tax go up when I did nothing to the house?

Rising local assessments or an increase in the tax rate can raise the bill even without improvements to your property.

Are property taxes tax deductible?

They can be if you itemize, but the combined deduction for state and local taxes is capped under current federal rules.