Homeowners opened their mailboxes last year to an unwelcome surprise: property tax bills that had climbed an average of 3 percent from the year before, according to data compiled by the New York Times. The culprit wasn't just rising home values — municipalities across the country also increased their tax rates to fund everything from school budgets to infrastructure repairs.

For many families already squeezed by elevated mortgage rates and insurance premiums, that extra few hundred dollars feels like the last straw. But tax professionals say homeowners shouldn't simply accept the bill as gospel. There are concrete steps you can take to challenge your assessment, and in many cases, win a reduction.

"People think property tax assessments are handed down from on high, but they're actually quite fallible," says Marcus Chen, a property tax consultant based in Chicago. "Assessors are working with imperfect data, often on tight deadlines. Mistakes happen constantly."

Understanding Why Your Bill Went Up

The 3 percent average increase masks significant regional variation. Some suburban counties saw jumps exceeding 8 percent, while a handful of rural areas actually experienced slight declines as populations shifted and property values stagnated.

Two factors typically drive increases: rising property values and higher tax rates. When your local government needs more revenue — perhaps to cover teacher salaries or repair aging water systems — officials can vote to increase the millage rate, which is the amount of tax per thousand dollars of assessed value. Even if your home's assessed value stays flat, a rate increase means a higher bill.

The other driver is reassessment. Most jurisdictions reassess properties every few years to reflect current market values. If home prices in your neighborhood have climbed sharply, your assessed value will likely follow, even if you haven't made improvements to your property.

Your First Move: Check for Errors

Before mounting a formal appeal, scrutinize your assessment notice for basic errors. According to the National Taxpayers Union, between 30 and 60 percent of properties in the United States are over-assessed at any given time.

Look for factual mistakes: Does the assessment list the correct square footage? The right number of bedrooms and bathrooms? Is your lot size accurate? Tax experts say these clerical errors are surprisingly common, especially in jurisdictions that rely on outdated records or aerial photography that can't distinguish between a finished basement and a crawl space.

"I once saved a client $4,000 a year because the assessor's office had her listed as having a three-car garage when she actually had a carport," Chen recalls. "That's money back in her pocket every single year going forward."

Gather Comparable Sales Data

If the facts are correct but you still believe your assessment is too high, you'll need evidence. The most persuasive argument involves comparable sales — recently sold homes in your neighborhood that are similar in size, age, and condition to yours.

Most jurisdictions provide a window of time, typically 30 to 90 days from when you receive your assessment notice, to file an appeal. Use that time to research. County assessor websites often publish recent sales data, and real estate platforms can help you identify properties that sold for less than your assessed value despite being comparable.

"You're essentially doing what a real estate appraiser does," explains Jennifer Lawson, a tax attorney in Austin, Texas. "You want at least three to five solid comparables that sold within the past year, ideally within a half-mile radius. The more similar they are to your property, the stronger your case."

Pay particular attention to homes that sold after distress events — foreclosures or estate sales — as these can drag down neighborhood values. If several comparable properties sold for significantly less than your assessed value, you have the foundation for an appeal.

The Formal Appeal Process

Each jurisdiction has its own procedures, but most follow a similar pattern. You'll file a written appeal with your local assessment review board, often called a Board of Equalization or Board of Review. Some jurisdictions require you to first attempt an informal review with the assessor's office.

Prepare a clear, factual presentation. Include photographs of your property alongside the comparables, highlighting any defects or deferred maintenance that might justify a lower valuation. If your roof needs replacement or your HVAC system is on its last legs, document it.

"Emotion doesn't win these cases," Lawson cautions. "Saying 'my taxes are too high' won't get you anywhere. You need data showing your property is assessed above market value relative to similar homes."

Many homeowners represent themselves successfully, but in cases involving high-value properties or complex appeals, hiring a property tax consultant or attorney might make sense. Some work on contingency, taking a percentage of your tax savings rather than charging upfront fees.

When Exemptions Can Help

Beyond challenging your assessed value, investigate whether you qualify for exemptions or relief programs. Most states offer homestead exemptions that reduce the taxable value of your primary residence. Senior citizens, veterans, and disabled homeowners often qualify for additional breaks.

These exemptions don't happen automatically — you typically need to apply. "I'm constantly amazed by how many people leave money on the table because they don't realize they qualify," says Chen. "A veteran might be entitled to a $50,000 exemption but never filed the paperwork."

Some jurisdictions also offer tax deferral programs for seniors or those facing financial hardship, allowing you to postpone payment until the property is sold. While you'll eventually owe the taxes plus interest, it can provide crucial breathing room for those on fixed incomes.

The Bigger Picture

Rising property taxes reflect a tension at the heart of local government finance. Communities need revenue to maintain services, but property taxes are among the most visible and painful ways to collect it. Unlike income taxes withheld from paychecks, property tax bills arrive as a lump sum, making the pain acute.

As reported by the New York Times, some municipalities are exploring alternative revenue sources or restructuring tax systems to reduce reliance on property taxes. But for now, homeowners face the system as it exists.

The appeal process exists precisely because assessments are imperfect. Using it isn't gaming the system — it's ensuring you pay your fair share, no more. In a year when every dollar counts, that difference might fund a family vacation, bolster an emergency fund, or simply provide peace of mind.

"People think appealing their property taxes is this Herculean task," Chen says. "But I've seen homeowners save $2,000 a year with three hours of work. That's a pretty good hourly rate."