Several different local bodies can raise your property taxes, and they act independently of one another. Your city council or county board, your school district, any special purpose districts you fall inside, and local voters through bond and levy referendums each have their own authority to push your bill up. The county assessor can do it too, not by changing a rate but by raising what your property is worth on the tax rolls. Understanding who raises property taxes starts with recognizing that no single office is in charge.
City Councils and County Boards
Your city council or county board of supervisors is the most visible authority behind a property tax increase. Every year these elected officials approve a budget covering roads, law enforcement, parks, fire services, and administrative operations. To fund it, they set a millage rate, the amount of tax charged per $1,000 of assessed value. When planned spending outruns what the existing rate brings in, the council or board votes to raise the millage.
Many jurisdictions also calculate a rollback rate, sometimes called the effective tax rate. That’s the rate that would generate the same total revenue as the prior year after accounting for changes in property values. If your local government adopts a rate higher than the rollback rate, it’s collecting more money than before, even without formally voting for a “tax increase.” Roughly 20 states have adopted Truth in Taxation laws to address exactly this. They require local governments to publicly advertise the proposed increase, hold public hearings, and notify property owners, often by direct mail or newspaper publication, before adopting a rate above the rollback threshold.
Where those transparency rules apply, skipping the notification steps can expose the government to legal challenges. The practical point: if your city or county plans to collect more property tax revenue than last year, you should get advance notice and a chance to speak up before the vote.
School District Boards
School districts are independent taxing authorities, legally separate from your city or county. An elected school board, or in some areas an appointed one, decides how much property tax revenue the district needs for teacher salaries, building maintenance, classroom technology, and transportation. The county treasurer typically collects the money, but the board alone sets the amount.
The school portion is often the largest single piece of your bill. Local sources, predominantly property taxes, account for roughly 45 percent of all public K–12 education funding nationwide, with the rest coming mostly from state government and a smaller share from federal programs.1National Center for Education Statistics. Public School Revenue Sources In many communities, the school levy alone makes up half or more of the total property tax bill.
State funding formulas influence how much falls on you locally. Most states use some form of equalization: districts with lower property values per student receive more state aid, while wealthier districts lean harder on local property taxes. When state funding falls short or enrollment shifts, the school board may vote to raise its levy to close the gap. Those decisions happen at public board meetings, and in some states a levy increase past a certain threshold requires voter approval through a referendum.
Special Purpose Districts
Smaller charges on your bill often come from special purpose districts, independent entities that handle a single service such as fire protection, library operations, mosquito control, or water and sewer management. Each district has its own governing board with legal authority to set a tax rate within its boundaries. A fire district can raise its levy even if the city holds its rate flat. A library district can do the same.
These districts are typically created through local petitions or direct legislative action. Because they operate independently from your city or county, they can add a layer of taxation that many homeowners don’t notice until they read their bill line by line. If your property falls inside multiple overlapping districts, each one contributes its own charge.
One related item you may see is a special assessment. That’s not the same thing as a district levy. A special assessment pays for a specific improvement, such as a sidewalk, streetlight, road widening, or sewer upgrade, and can only be charged to properties that directly benefit from the project.2FHWA. Special Assessments Fact Sheet It’s a limited-duration charge tied to a capital project, not an ongoing tax rate.
The County Assessor
The county assessor doesn’t set a tax rate, but controls the other half of the equation: your property’s assessed value. Because your bill equals the assessed value multiplied by the combined millage rate, a higher assessment raises your bill even when no taxing authority touches its rate. This is one of the most common reasons property taxes climb from year to year.
Assessors use mass appraisal, a system that values large numbers of properties at once using standardized methods and statistical models. Computer-Assisted Mass Appraisal software groups similar properties and analyzes recent sale prices of comparable homes to estimate market value. Because properties are valued in batches rather than individually, occasional inaccuracies for specific homes are inevitable, which is why the appeal process exists.
How often your property gets reassessed depends on where you live. About 27 states require annual reassessment, while most of the rest mandate it at least every three years. A small number of jurisdictions reassess less frequently, and some counties have gone years without a full revaluation. Between scheduled reassessments, your assessed value generally holds steady unless you make significant improvements or the market shifts sharply.
Many jurisdictions don’t tax full market value. They apply an assessment ratio, a percentage of market value that becomes your taxable base. Ratios vary widely, from as low as around 6 percent in some areas to 100 percent in others. If your home has a market value of $400,000 and the assessment ratio is 40 percent, your taxable value is $160,000, and the combined millage applies to that figure, not the full price.
Voters at the Ballot Box
Sometimes a property tax increase comes directly from voters. When a local government wants to issue bonds for a major capital project, such as a new school building, hospital expansion, or road overhaul, the law in most states requires voter approval before it can take on the debt. If the measure passes, the resulting debt service becomes a line on every property owner’s tax bill within the district.
Bond measures and operating levies serve different purposes and appear as separate entries. Bond revenue can only fund capital projects like construction and major renovations; it cannot pay salaries or cover daily operating expenses. Operating levies fund ongoing costs: teacher pay, utilities, supplies, transportation. Both typically require voter approval.
Approval rules vary by state. Some require a simple majority to pass a bond measure, while others demand a supermajority, often 60 percent, along with a minimum voter turnout. Operating levies may have their own thresholds. Once voters approve the measure, the resulting tax is legally binding on all property owners in the district, including those who voted against it or didn’t vote at all.
What Limits How Much Any of Them Can Raise
Nearly every state imposes some legal ceiling on how much local governments can raise property taxes. The protections generally fall into three categories:
- Assessment limits cap how much your property’s assessed value can rise from one reassessment period to the next. Even if market value jumps 20 percent, an assessment limit might restrict the taxable increase to a smaller figure.
- Rate limits cap the millage rate a jurisdiction can charge, preventing the rate itself from exceeding a fixed ceiling.
- Levy limits cap the total property tax revenue a government can collect in a given year, often tying growth to inflation or a set percentage.
Most states use at least one of these, and many use a combination. Only a handful have no property tax cap at all. Some caps are written into state constitutions, while others are set by state legislatures and can be adjusted over time.
Two additional programs work in the opposite direction, cutting what you owe rather than what the government can charge. Most states offer a homestead exemption that reduces the taxable value of your primary residence, either by a fixed dollar amount or a percentage. You typically need to file an application, and it only covers the home you actually live in, not rental properties or second homes. More than 30 states also run circuit breaker programs that limit property taxes based on household income; when your tax burden exceeds a set percentage of income, the program trips and provides relief through a credit or rebate. Some are limited to seniors or people with disabilities, others cover any income-eligible homeowner.
How to Push Back on an Assessment
Of all the actors who can raise your taxes, the one you can most directly challenge is the assessor. If your property’s assessed value seems too high, you have the right to appeal. Details differ by jurisdiction, but the pattern is similar:
- Read your assessment notice for factual errors. Wrong square footage, an extra bedroom or bathroom, a misidentified lot size, or an incorrect property classification are the easiest grounds for a correction.
- Gather comparable sales data. The most persuasive evidence is recent sales of similar homes in your area that went for less than your assessed value. Focus on properties comparable in size, age, condition, and location.
- File on time. Most jurisdictions give you a window of roughly 25 to 90 days after you receive the notice. Miss it and you lose the right to challenge for that tax year.
- Attend the hearing. A local board of review, equalization board, or assessment appeals board hears the case. The assessor explains the valuation, you present your evidence, and the board decides.
- Escalate if needed. If the local board denies your challenge, most states let you appeal to a state-level board or file in court within a set timeframe.
There’s generally no filing fee at the local level, and you don’t need a lawyer, though an appraiser or tax consultant can help on high-value properties. Even if you don’t win a full reduction, an appeal puts your property under a closer look, which sometimes produces a smaller correction.