Property Tax Assessments
Assessed values, tax rates, and appeal outcomes for every parcel -- the valuation layer Zillow wishes it had.
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Find Me This Data →Overview
What Are Property Tax Assessments?
Property tax assessments are the official valuations of real estate parcels used by municipalities to determine tax obligations. These assessments include the assessed value of each property, applicable tax rates, and outcomes from appeals filed by property owners challenging their valuations. This data layer provides comprehensive insight into how properties are valued across jurisdictions and represents a critical information asset for real estate investors, property owners, and tax professionals who need accurate valuation benchmarks. The property tax assessment market encompasses services that help property owners track, analyze, and challenge their assessments. With increasing awareness of appeal rights—tax appeals rose approximately 15% in the past year—property owners are actively seeking data on assessed values versus market values to identify overassessment. This creates demand for granular assessment data, comparable sales information, and appeal outcome histories that inform valuation strategies.
Market Data
$119.06 billion
Property Tax Service Market Size (2024)
Source: Market Research Future
$180.59 billion
Projected Market Size (2035)
Source: Market Research Future
3.86% CAGR
Market Growth Rate (2025-2035)
Source: Market Research Future
~15% increase
Year-over-Year Tax Appeals Growth
Source: Market Research Future
$200,000 on $50M portfolio with 20% overassessment
Potential Annual Tax Overpayment (Example)
Source: NSKT Global
Who Uses This Data
What AI models do with it.do with it.
Commercial Real Estate Owners
Commercial property owners are the fastest-growing segment, using assessed value data and appeal outcomes to challenge overassessments on complex assets. Commercial properties benefit from detailed assessment data when appealing valuations that exceed market values.
Residential Property Owners
Residential property owners constitute the largest segment, using assessment data to track valuations across single-family and multi-family units as ownership structures and market values change. They leverage appeal outcome data to understand successful challenge strategies.
Real Estate Investment Firms
Investment firms use comprehensive assessment records, tax rate schedules, and appeal histories to evaluate portfolio holdings, model true all-in costs per unit, and identify properties where assessed values significantly exceed market values—warranting appeal consideration.
Tax Consultants and Appraisers
Tax professionals and qualified appraisers use historical assessment data and appeal outcomes to build cases for clients, preparing valuation reports that support appeals to assessment boards based on market data and property-specific evidence.
What Can You Earn?
What it's worth.worth.
Research Report Access
Pricing varies based on volume, exclusivity, and licensing terms
Note: Market research reports about this category typically run $4,950-$7,250, but actual data licensing prices are negotiated case-by-case based on volume, freshness, and exclusivity.
Assessment Data Licenses
Varies
Varies by jurisdiction, granularity (parcel-level vs. aggregated), and update frequency (annual vs. real-time). Commercial-grade feeds command premium pricing.
Appeal Outcome Datasets
Varies
Historical appeal records and outcomes vary by state and county availability; specialized appeal databases are typically licensed at premium rates to tax professionals and litigation support firms
What Buyers Expect
What makes it valuable.valuable.
Accuracy & Timeliness
Assessed values must match official municipal records; tax rate schedules must reflect current fiscal year regulations. Buyers verify data against county assessor offices and require regular updates as assessments change.
Comprehensive Parcel Coverage
Complete geographic coverage with all parcels in target jurisdictions—residential, commercial, and industrial—alongside property characteristics (size, zoning, use type) needed to contextualize assessments.
Appeal Outcome Documentation
Historical records of appeal filings, hearing dates, prior assessments, and outcomes showing reduction percentages and reasoning. This allows buyers to model success rates and estimate savings potential for overassessed properties.
Market Value Benchmarking
Assessed values paired with recent comparable sales, market value estimates, and effective tax rates enable buyers to identify discrepancies and flag overassessed properties exceeding market values by more than 10%.
Companies Active Here
Who's buying.buying.
Provides property data solutions and recently expanded through acquisition of technology firms specializing in property data, offering assessment and valuation tools to optimize property tax administration
Major player in property valuation and tax services market, competing in assessment analytics and property value benchmarking for owners and investors
Property services provider competing in the property tax service market with solutions for valuation and tax administration
Refining analytical tools to optimize property tax administration and promote transparency for municipalities and property owners
FAQ
Common questions.questions.
How much can property owners save by challenging overassessed values?
Example impact: A $50 million property portfolio with a 2% effective tax rate pays $1 million yearly. If assessments are 20% too high, that equals $200,000 in annual overpayment—$1 million over five years. Properties where assessed values exceed market values by more than 10% warrant serious appeal consideration.
What recent market trends affect property tax assessment data?
Tax appeals have risen approximately 15% in the past year as property owners gain awareness of appeal rights. Office building assessments are being scrutinized heavily, with some jurisdictions reducing office valuations by 10-30% to reflect market declines. Technological integration is also reshaping service delivery, enhancing efficiency and accuracy.
Which property owner segments drive the most growth in this market?
Commercial property owners represent the fastest-growing segment, propelled by the increasing complexity of commercial real estate transactions and the need for specialized tax services. Residential property owners remain the largest segment by volume, driven by the high number of single-family and multi-family units requiring ongoing management.
What data points are essential for a strong tax appeal case?
Build cases using: assessed values paired with current market values, recent comparable sales data, qualified appraiser valuations, property-specific characteristics, and historical appeal outcomes showing reduction rates. Appeals supported by professional appraisals succeed far more often than those without detailed valuation documentation.
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