Property Tax Calculator

The starting point is market value — what a property would likely sell for in an open-market transaction. Most jurisdictions do not tax full market value. Instead, they apply an assessment ratio, typically anywhere from 10% to 100%, to arrive at the assessed value. In a 100% assessment state, market value and assessed value are the same. In a 10% assessment state, a $400,000 home has an assessed value of $40,000.

The taxable value is the assessed value minus any exemptions. The homestead exemption is the most common: many states and counties subtract a flat dollar amount, or a percentage, for a property that is the owner's primary residence. Other exemptions may apply to seniors, veterans, disabled residents, agricultural land, or nonprofit uses. Exemptions reduce the taxable value, not the tax rate, so a $50,000 exemption at a 1.2% effective rate saves about $600 per year.

The tax itself is computed as taxable value multiplied by the effective tax rate, plus any special assessments. Special assessments are flat annual charges for specific improvements such as street lighting, drainage, solid waste, or bond debt service. They are not tied to value, so a $200 annual solid-waste assessment adds $200 to the bill regardless of whether the home is modest or expensive.

Effective tax rate is the cleanest way to compare tax burden across states and counties. It equals the median real-estate tax paid divided by the median home value, expressed as a percentage. One mill equals $1 of tax per $1,000 of taxable value, or 0.1%. A 1.2% effective rate is therefore 12 mills. The state/county lookup in this calculator uses the Calcuris U.S. Property Tax Rates 2026 dataset, compiled from U.S. Census Bureau ACS 2023 5-year estimates and Tax Foundation state-level data, licensed under CC BY 4.0.

Florida assesses real property at 100% of market value for tax purposes, so a $450,000 home has an assessed value of $450,000. The state offers a $50,000 homestead exemption for a primary residence, reducing the taxable value to $400,000. The homeowner also qualifies for an additional $25,000 senior exemption offered by the county, for a total exemption of $75,000 and a taxable value of $375,000.

Using a county effective tax rate of 0.95%, the base annual tax is $375,000 × 0.0095 = $3,562.50. The local solid-waste and fire-rescue special assessments add $320 per year, bringing the estimated annual tax to $3,882.50. Divided by 12, that is roughly $324 per month before any mortgage escrow cushion.

Florida's Save Our Homes cap limits the annual increase in assessed value for homesteaded properties to the lower of 3% or the consumer price index. If the cap is enabled in this calculator, the assessed value can grow no more than 3% per year even if market value rises faster. In year two the assessed value would be capped at $450,000 × 1.03 = $463,500, not the full market value. Over five years the cumulative tax is roughly $20,500 instead of the uncapped projection, demonstrating how valuable the cap can be in a fast-appreciating market.

This example is illustrative. Actual tax bills depend on the exact millage rates set by the city, county, school board, and special districts that overlap a given parcel, plus any non-ad valorem assessments. The calculator gives a strong first estimate; the final bill comes from the tax collector's office.

Effective property tax rates vary dramatically across the United States. According to the Calcuris 2026 dataset, the highest statewide effective rates are found in New Jersey and Illinois, both near 1.88%, while Hawaii is lowest at roughly 0.29%. Alabama, Utah, Arizona, and South Carolina also cluster below 0.50% at the state level.

Within a single state, county-level rates commonly vary by a factor of three to five. A homeowner in one county may pay twice as much as an identical home in a neighboring county because of different school district levies, municipal debt, and special district boundaries. That is why the county lookup matters: using a state average can miss the actual bill by hundreds or thousands of dollars.

The dataset covers roughly 3,100 counties and county equivalents. Rates are derived from the ratio of median real-estate taxes paid to median owner-occupied home value in the Census Bureau's American Community Survey. Because it is a ratio of medians, it smooths out individual property characteristics and is best used as a benchmark rather than a parcel-specific quote.

Investors should pay special attention to non-homesteaded properties. Many exemptions, including the homestead exemption and assessment caps, apply only to a primary residence. A rental property or second home may be assessed at full market value with no cap protection, so the effective investor tax rate can be materially higher than the owner-occupied median shown in the data.

Exemptions are the fastest way to reduce a property tax bill, but they are not automatic. The homestead exemption usually requires the owner to occupy the home as a primary residence as of January 1 of the tax year and to file an application with the county property appraiser. Deadlines vary by state; missing the filing window can cost a full year of savings. Seniors, veterans, and disabled homeowners often have separate applications with their own income or age thresholds.

Assessment caps limit how fast taxable value can grow, regardless of market value. Florida's Save Our Homes cap, California's Proposition 13, and similar programs in other states create a widening gap between market value and assessed value over time. That gap is a hidden asset for long-term owners but can shock new buyers: the seller's capped assessed value resets to market value upon sale, so the buyer's tax bill may be much higher than the seller's was.

Special assessments are often overlooked because they do not appear in the headline millage rate. They may fund road paving, sewer expansion, street lighting, fire-rescue services, or community development districts. In some states these appear as non-ad valorem assessments on the tax bill and are not subject to homestead exemptions or caps. Buyers should read the full tax bill, not just the ad valorem portion.

When using this calculator, enter the total of all exemptions you actually receive, not the maximum advertised by the state. Enter special assessments as an annual dollar amount. If your jurisdiction uses an assessment cap, enable the toggle and enter the annual percentage limit. If you are unsure, leave the cap off and treat the projection as an uncapped estimate.

Every property owner has the right to challenge an assessed value that appears too high. The first step is to review the property record card from the county property appraiser's office for errors in square footage, bedroom count, lot size, or condition. Clerical errors are common and often the easiest to fix.

The second step is to gather comparable sales. An appeal based on market value usually requires three to five sales of similar properties in the same neighborhood, adjusted for differences in size, age, condition, and features. Sales should be as close to the assessment date as possible; many jurisdictions use a January 1 value date.

The third step is to understand the calendar. Most counties have a short window, often 30 to 60 days after the notice of proposed property taxes is mailed, to file a petition. Missing the deadline usually means waiting until the next tax year. Some jurisdictions offer an informal review first, followed by a formal hearing before a value adjustment board.

As a Florida-licensed real estate broker and county commercial real estate appraiser, I have seen thousands of assessments. The best appeals are factual, concise, and supported by evidence. Emotional arguments about affordability rarely succeed; a well-supported value opinion often does. If the disputed amount is large, hiring a certified appraiser or a property tax attorney can pay for itself quickly.