The assessed value on your property taxes is the dollar figure your local tax assessor assigns to your home for the sole purpose of calculating what you owe. Your taxing authorities multiply that number by their tax rates to produce your annual bill. It is a government determination, not a sale price, and it frequently comes in lower than what your home would fetch on the open market.
Assessed Value Is Not Market Value or Appraised Value
Three different dollar amounts can describe the same house, and mixing them up is the most common source of confusion when a tax notice arrives.
Market value is what a willing buyer would pay a willing seller under normal conditions. It moves with supply, demand, interest rates, and neighborhood trends, and it shows up in listing and sale prices.
Appraised value is a licensed appraiser’s formal opinion, usually produced for a sale or refinance. The appraiser inspects the home, pulls comparable sales, and delivers a number the lender relies on. It’s tied to a specific transaction and a specific date.
Assessed value exists only for taxation. It may sit well below market value because many jurisdictions apply an assessment ratio, or because local caps prevent the figure from keeping pace with rising prices. A home worth $400,000 on the open market might carry an assessed value of $280,000 on the tax notice. That gap is built into the system.
What Assessors Look At
Assessors work from a property record card kept by the local government. Square footage of livable space and total lot size are the starting points. Bedroom and bathroom counts, finished basements, attached garages, and overall condition move the number up or down. A remodeled kitchen adds value. A failing roof subtracts.
Location carries as much weight as the structure. Proximity to good schools, parks, or commercial districts pushes values higher. Nearby industrial zones or flood-prone land pulls them lower. Assessors also watch recent sale prices of comparable homes to keep valuations across a neighborhood consistent. When a house like yours sells for well above the assessments on your street, expect an upward nudge at the next cycle.
Building permits are one of the clearest signals to the assessor’s office. In most jurisdictions, permit-issuing agencies forward copies of every permit directly to the assessor. A new deck, a converted garage, or a swimming pool will almost certainly raise your assessed value once the work is finished, or at the next assessment date. Even partly completed construction can be valued at its estimated worth as of the assessment date.
Assessment Ratios and Annual Caps
Many jurisdictions do not tax the full market value of your home. They apply an assessment ratio, a fixed percentage set by state or local law, to arrive at the assessed value. If the market value is $300,000 and the local ratio is 80%, the assessed value used for tax purposes is $240,000. Ratios vary widely. Some states assess at 100% of market value; others use percentages as low as about 33%. Your assessor’s office or the local tax code will tell you which ratio applies.
Several states also limit how much your assessed value can rise from year to year, regardless of what the market does. These caps typically run somewhere between 2% and 10% annually for homestead properties, with a few states using multi-year limits. The idea is to shield longtime owners from being priced out during a hot market.
The caps almost always reset when the property changes hands. A home held for a decade under a modest annual cap can jump to full market value the moment it sells, so a new buyer’s bill may be dramatically higher than what the previous owner paid. Significant renovations or a change in classification can also trigger a reset. It’s why two identical houses on the same block can carry very different assessed values.
Exemptions That Reduce the Taxable Portion
Before the tax rate is applied, exemptions may knock a chunk off the assessed value. The most common is the homestead exemption, available in most states for owner-occupied primary residences. Depending on the state, it either subtracts a flat dollar amount or reduces the assessed value by a set percentage.
Other reductions frequently available include:
- Senior citizens, often 65 and older, may qualify for a partial exemption or an assessment freeze that stops the taxable value from climbing.
- Disabled veterans typically receive an exemption tied to their disability rating, and veterans with a 100% service-connected disability sometimes pay no property tax at all on their primary residence.
- Un-remarried surviving spouses of deceased veterans or service members killed in action often inherit the veteran’s exemption.
- Low-income homeowners may benefit from circuit-breaker programs that cap property taxes at a percentage of household income.
Exemptions rarely apply automatically. You have to file an application with the assessor’s office, and missing the deadline usually means waiting another year. If you’ve owned your home for a while and never applied, check whether you qualify for something you’ve been paying around.
How the Number Becomes Your Bill
Assessed value minus exemptions equals taxable value. The local authorities then apply a tax rate, usually expressed as a millage rate. One mill equals one dollar of tax for every $1,000 of taxable value. A taxable value of $200,000 combined with a total millage of 20 mills produces an annual property tax of $4,000.
Most homeowners pay under several overlapping millage rates at once. The county, city, school district, and sometimes special districts for fire protection or libraries each set their own rate, and the total millage is the sum. School district levies are often the single largest component. When any of these bodies raises its rate or your assessed value goes up, so does your bill.
When Assessments Get Redone
Assessed values don’t sit still. Jurisdictions reassess on schedules that range from annual to once every five or six years. Some states use computer models and market data every year; others rely on periodic physical inspections that might come around once a decade.
Outside the regular cycle, certain events trigger an immediate reassessment:
- A sale or transfer, which is the single most common trigger, generally causes the property to be reassessed to reflect the purchase price or current market value.
- New construction or major renovation, flagged by permits, adds value for the improved portion.
- A change in use, such as converting a residence to a rental, splitting a home into multiple units, or rezoning land for development, can prompt a new valuation.
- Natural disaster damage from a fire, flood, or storm can support a request to reassess downward.
Knowing your jurisdiction’s schedule helps with budgeting. If reassessments happen only every few years, your bill can stay flat for a while and then jump sharply in a reassessment year, even when market values climbed gradually the whole time.
Where to Find Your Assessed Value
The most direct source is the annual property tax statement mailed to the owner of record. It shows the assessed value, any exemptions, the tax rates applied, and the total due. If yours is lost, the same information is almost always available online through the county assessor’s website, searchable by address or parcel number. Many counties also offer GIS mapping tools where you can click on any parcel and pull up assessment data, which is a straightforward way to compare your number against similar homes nearby. If your house is assessed $50,000 higher than a comparable home across the street, that’s worth a closer look.
How to Appeal an Assessment That Looks Too High
If your assessed value seems too high, you can challenge it. Most homeowners skip this step assuming they’ll lose, but a well-prepared appeal has a reasonable chance, especially when the assessor used outdated comparable sales or missed real defects in the property.
A typical appeal moves through these steps:
- Contact the assessor informally first. Many offices will fix obvious errors on the property record card, like a bedroom that doesn’t exist, without a formal hearing.
- File a formal appeal if the informal route doesn’t resolve it. You submit a written protest to the local board of review or equalization. Deadlines vary, often 30 to 60 days after you receive the assessment notice, though some jurisdictions use fixed calendar deadlines.
- Bring evidence. Recent comparable sales showing lower values, an independent appraisal, photos of damage or deferred maintenance, and documentation of errors in the assessor’s records are the strongest material.
- Attend the hearing. Keep it focused on the numbers rather than complaints about the tax bill in the abstract.
If the board rules against you, most states allow further appeal to a state tax tribunal or court, though cost and complexity climb from there. For the initial appeal, filing fees are usually modest, and a successful challenge can lower your bill for years, not just once.
Whether You Can Deduct Property Taxes Federally
Property taxes on your primary residence and other real property are deductible on your federal return if you itemize. They fall under the state and local tax (SALT) deduction, which combines property taxes with state income or sales taxes up to a cap. For tax year 2026, that cap is $40,400 for most filers, or $20,200 if married filing separately.1Office of the Law Revision Counsel. 26 U.S. Code 164 – Taxes The cap phases down for taxpayers with income above $505,000.
The deduction only helps if your itemized deductions beat the standard deduction. For many homeowners with smaller mortgages or in lower-tax areas, the standard deduction wins and the property tax deduction goes unused. In a high-tax jurisdiction, or paired with significant mortgage interest, SALT can meaningfully offset the burden of a high assessed value.