Property tax rates are set by the local governing bodies that tax your parcel: the county, the city or town, the school district, and any special-purpose districts (fire, library, water, stormwater) whose boundaries you sit inside. Each one adopts its own rate through its own budget vote, and your bill is the sum of all of them applied to your property’s assessed value.
No single official picks the number. The rate on your bill is the arithmetic result of decisions made by several elected boards, each answering to a different slice of local government.
The Layers of Government on Your Tax Bill
A single parcel typically falls inside four or more taxing jurisdictions at once. Each sets a rate independently.
Counties usually form the base layer, funding county roads, courts, and public health. Cities and towns stack their own rate on top for municipal services such as local police, street maintenance, and parks. School districts operate as independent taxing entities, and in most areas the school rate is the largest single piece of the bill. Special-purpose districts add narrower charges for services like fire protection, libraries, emergency medical response, or stormwater management.
Every one of these entities adopts its rate through its own public process. The individual rates are then combined into the single figure printed on your bill.
Some bills also carry non-ad valorem assessments — flat per-parcel charges for services like solid waste collection. These aren’t based on your property’s value, so two neighboring homes pay the same amount regardless of what they’re worth.
How Each Body Arrives at Its Rate
Every taxing jurisdiction follows the same annual cycle. Officials estimate what it will cost to run their operations for the coming year. They subtract expected revenue from other sources — fees, fines, grants, state aid. Whatever is left over has to be raised from property owners, and that dollar amount is called the tax levy.
Before the levy is finalized, the jurisdiction holds public hearings. Residents can review the proposed budget, ask about spending priorities, and object. Advance notice is required, though the specific window varies; some jurisdictions require as few as five days, others longer. After the hearing, the governing board votes to adopt the final levy.
Turning that levy into a rate is straightforward division. Finance officers divide the total levy by the total assessed value of all taxable property in the jurisdiction. If a town needs $1,000,000 and the combined assessed value of everything inside its borders is $100,000,000, the rate is 0.01, or 1%.
What the Assessor Does (and Doesn’t) Do
The tax assessor is a local official, elected or appointed depending on where you live, whose job is to estimate the value of every taxable property. The assessor does not set rates. That distinction matters when you’re trying to figure out who to talk to: complaints about the rate go to the boards that voted on the levy; complaints about the number attached to your specific property go to the assessor.
Assessors estimate market value using sales of comparable properties, the cost to rebuild minus depreciation, or, for rental and commercial property, the income the property generates. The total of all those individual values is the tax base — the denominator that turns a levy into a rate.
Many states don’t tax property at full market value. They apply an assessment ratio that reduces market value to a smaller “assessed value” for tax purposes. A home worth $400,000 in a state using a 25% ratio has an assessed value of $100,000. Some states use 100%; others go as low as 20%. Ratios can also differ by property class, so residential and commercial owners in the same state may be assessed on different percentages of value.
Reassessment schedules vary widely. Most states require reassessments somewhere between annually and every five years. A few allow gaps of up to ten years. Some have no statewide requirement and leave the timing to counties, and a handful reassess only when a property sells or new construction is completed.
How Millage Turns Into Your Bill
Rates are commonly expressed in mills. One mill is $1 for every $1,000 of assessed value, so a rate of 0.01 is 10 mills.
To find your bill, multiply your assessed value (after any exemptions) by the combined millage from every jurisdiction taxing your parcel. A home assessed at $200,000 in an area with a combined rate of 10 mills owes $2,000 for the year.
Why Your Bill Can Rise When the Rate Doesn’t
The relationship between rates and values is inverse. When assessed values across a jurisdiction rise broadly, the rate needed to fund the same budget can hold flat or even fall, because the same levy is spread across a larger base. When values drop, the rate often has to climb to raise the same money.
That’s why your individual bill can go up even in a year no board voted to raise anything: your property’s value rose faster than the jurisdiction-wide average, so a larger share of the unchanged levy landed on you.
About 20 states have adopted truth-in-taxation laws to address what’s called a “silent tax increase” — the situation where rising values quietly deliver more revenue to a jurisdiction that never touched its rate.1Lincoln Institute of Land Policy. State Requirements Under Truth in Taxation Laws for Property Taxes These laws require the jurisdiction to publicly disclose the effect and hold hearings before collecting the extra money.
State Limits on What Local Governments Can Charge
States set the legal framework that caps how far local taxing power can reach. The limits generally come in three forms.
Rate caps set a maximum tax rate a jurisdiction cannot exceed without voter approval. Levy caps limit how much the total dollar levy can grow year over year, often tied to a fixed percentage or the rate of inflation, whichever is lower. Assessment caps, used by roughly a dozen states, limit how much your individual property’s assessed value can rise annually regardless of what the market did; these caps range from 2% to 10% depending on the state and property type.
State revenue departments oversee compliance. A jurisdiction that exceeds its legal authority can face legal challenges or be forced to roll back collections.
What to Do If the Number Looks Wrong
If your assessment seems too high, or the assessor’s records describe a house that isn’t yours, you can appeal. The strongest grounds are factual errors (wrong square footage, wrong lot size, wrong room count), a recent sale price well below the assessed value, or comparable properties nearby carrying lower assessments.
The process varies by jurisdiction but generally runs like this:
- Read your assessment notice line by line and check every detail against your property. Record errors are more common than people expect and are the easiest to fix.
- File within the deadline. Windows are strict, usually 30 to 90 days from the mailing date of the notice, not the date you opened it. Filing fees range from nothing up to about $150.
- Gather evidence: recent sales of comparable homes, photos of your property’s condition, contractor estimates for needed repairs, or an independent appraisal.
- Attend the hearing before the local board of review or equalization. You and the assessor’s office both present. The burden is on you to show the assessed value does not reasonably reflect market value.
If the local board rules against you, most states allow a further appeal to a state tax court or administrative body. Miss the filing window and the assessment locks in for the year; you’ll wait until the next cycle to try again.
Complaints about the rate itself are a different conversation, and they happen earlier in the year, at the budget hearings each taxing body holds before voting on its levy. That’s the only point where the rate is actually up for decision.