Property taxes go up because someone with authority votes to raise them or reassesses what your property is worth. In most places that means your city council or county commission, your school board, and the boards of any special districts you live in — each setting its own rate — while the county assessor separately determines the taxable value those rates are applied to. State legislatures set the outer limits on all of it, and voters approve certain increases directly at the ballot box. So the question of who raises property taxes usually has more than one answer on the same tax bill.
City Councils and County Commissions
Your city council or county commission is the body that actually votes each year on the property tax rate for general local government. During the annual budget cycle, these officials calculate how much money they need for services like police, fire, roads, and parks, subtract non-tax revenue such as fees and state aid, and turn the remainder into the property tax levy — the total dollars the jurisdiction will collect from property owners.
That levy is expressed as a millage rate. One mill equals $1 of tax for every $1,000 of assessed value. A home assessed at $300,000 in a jurisdiction with a combined 25-mill rate produces a $7,500 annual bill before exemptions.
Most states require public hearings before a new rate is adopted. Twenty states go further with “truth in taxation” laws that force specific disclosures whenever a proposed levy would collect more revenue than the prior year, even if the rate itself stays flat.1Lincoln Institute of Land Policy. State Requirements Under Truth in Taxation Laws for Property Taxes These laws typically require the local government to calculate a “rollback rate” (the rate that would generate the same revenue as last year), publish prominent newspaper notices, and hold a dedicated hearing before voting to exceed that rate. The purpose is to prevent what tax professionals call a “silent tax increase,” where rising values generate more money without any official vote to raise the rate.
School Boards and Special Districts
The school district usually takes the biggest single bite of your bill. In many communities, school taxes account for more than half the total. School boards operate as independent taxing authorities with their own budgets, entirely separate from city or county government, and they set their own millage rate to fund teacher salaries, construction, transportation, and everything else the district pays for.
Stacked on top of that, you may pay levies from special districts. The United States has more than 39,000 of these single-purpose government entities covering services like fire protection, water and sewer, libraries, or mosquito control. Each evaluates its own costs, sets its own rate, and bills property owners within its service boundaries. Your total property tax bill is the sum of several independent decisions by several independent boards, which is why the total can climb even when your city council holds its rate steady.
The County Assessor Sets the Value
The county assessor (called a “property appraiser” in some states) does not vote on any rate, but their work moves your bill just as much as any council vote. The assessor’s job is to estimate the market value of every property in the jurisdiction through mass appraisal — analyzing recent sales, construction costs, neighborhood trends, and property characteristics to value thousands of parcels at once rather than inspecting each home individually.
State law requires those valuations to be uniform and equitable: similar homes in similar locations should carry similar assessments. When a revaluation raises your property’s assessed value, your bill goes up even if no elected official touched the rate. That is the silent tax increase truth-in-taxation laws target, and it is the reason many homeowners blame the assessor when their bill jumps, even though the assessor has no say in the rate.
Assessors conduct jurisdiction-wide revaluations on a set schedule, annually in some states and every few years in others. Between full revaluations, many jurisdictions make interim adjustments based on market data or physical changes such as additions, renovations, or demolitions.
State Legislatures Set the Limits
Local officials set the rates, but state legislatures write the rulebook they follow. Every state’s constitution or statutes dictate how property is assessed, which exemptions must be offered, how appeals work, and how much local governments can collect. That framework is why property tax systems look so different from one state to the next.
State-imposed limits generally fall into three categories.2Institute on Taxation and Economic Policy. Capping Property Taxes: A Primer
- Rate caps restrict how high the millage rate can go, sometimes capping a homeowner’s total bill at a fixed percentage of the property’s value.
- Assessment caps limit how fast a property’s taxable value can grow each year, even if actual market value is rising faster.
- Levy caps restrict the total revenue a jurisdiction can collect, regardless of what happens to individual property values.
Some states use just one type; others layer two or three. Assessment caps are a common reason your taxable value and your market value can diverge significantly. If your state limits annual assessment increases to 3%, your taxable value may trail well behind what your home would actually sell for in a hot market.
States also set the assessment ratio, the percentage of market value that becomes taxable value. Some require valuation at 100% of market value. Others set the taxable value at a fraction, commonly 80% to 90%, and a handful go much lower. A home worth $400,000 might have a taxable value of just $320,000 under an 80% ratio, with the millage rate applied to the lower figure.
Voters at the Ballot Box
Some property tax increases require direct voter approval. Bond referendums are the most common example. A local government or school district proposes borrowing money for a major capital project such as a new school, fire station, or water treatment plant, and puts the question on the ballot. If voters approve, property taxes rise enough to repay the debt over a fixed period, and the increase typically expires once the bonds are paid off.
Voter approval is also required in many states when a local government wants to exceed a state-imposed tax cap or debt limit. That mechanism keeps large spending increases tied to public consent and gives property owners a direct vote on at least some portion of their tax burden, unlike the annual rate-setting process handled entirely by elected representatives.
What to Do When Your Bill Goes Up
If the increase came from a higher assessed value, you can appeal. Every state provides a formal process, usually starting with the local board of review or equalization. Deadlines are tight. In many jurisdictions you have only 30 to 90 days after receiving your assessment notice to file, and missing that window means waiting until the next assessment cycle.
The strongest appeals rest on hard evidence: recent sale prices of comparable nearby homes, an independent appraisal, documentation of property condition problems, or corrections to errors in the assessor’s property record such as wrong square footage or a phantom bedroom. Record corrections are surprisingly common and often the easiest wins. If the local board rules against you, most states allow a further appeal to a state-level tax tribunal or court.
Separately, check whether you are claiming every exemption you qualify for. Nearly every state offers some form of relief — homestead exemptions for a primary residence, additional reductions for seniors meeting age and income thresholds, partial or full exemptions for disabled veterans based on VA-certified disability ratings, and circuit breaker programs that cap tax liability as a percentage of household income. None of these apply automatically. You have to file with your local assessor’s office, provide documentation, and meet the filing deadline. Most offices will not backdate an exemption you failed to claim.