The notice arrives in the mail, usually in spring: your county’s official opinion of what your home is worth, and by extension, what you owe in property taxes. Most people glance at it and move on. According to a peer-reviewed study in Public Finance Review, the vast majority of homeowners never file a formal appeal, even when the assessed value looks inflated compared with what similar homes actually sold for. That reluctance is expensive, because the owners who do challenge their assessments win far more often than most people assume.
The Public Finance Review research, which analyzed thousands of appeal records across multiple Florida jurisdictions, found that roughly 30 to 40 percent of homeowners who filed formal protests secured a reduction, with the average successful appellant trimming several hundred dollars off the annual tax bill. In some of the country’s largest counties, the odds are even better. Texas Comptroller appraisal-review-board survey reports show that in Harris County (Houston), where more than 300,000 residential protests have been filed in peak years, success rates have regularly topped 50 percent. Filing is free in nearly every U.S. jurisdiction, and an unsuccessful appeal almost never triggers a higher assessment. The downside risk is essentially zero. The upside compounds every year the lower value stays on the books.
Why so many assessments miss the mark
County assessors are responsible for valuing every taxable parcel in their jurisdiction, sometimes hundreds of thousands of properties at once. Their mass-appraisal models pull from sales data, building permits, and neighborhood trends, but no algorithm can account for every factor that shapes a specific home’s value: deferred maintenance, a noisy intersection, an awkward floor plan the market discounts. When prices shift quickly, the gap between the model and reality widens.
That gap has grown in many markets over the past two years. Home prices surged through 2023 and into 2024 in much of the country, and assessors in jurisdictions that reassess annually have been catching up with aggressive value increases. But price growth has cooled or reversed in some metro areas since then, meaning some 2026 assessments may reflect a peak that the local market has already moved past. Reassessment cycles vary widely: some states update values every year, others only every three to five years. Between cycles, errors can persist uncorrected, and a homeowner who bought near a local peak may carry an inflated number for years unless someone flags it.
What the data actually shows
The clearest window into appeal outcomes comes from state-level administrative records and the academic research built on them…