Hidden Home Sales and Nondisclosure Laws Create Property Tax Valuation Challenges
Off-market home sales combined with nondisclosure laws that hide sale prices are creating information gaps that affect property tax assessments and create potential inequities. When sale data disappears behind multiple layers of secrecy, appraisal districts struggle to accurately value homes, and homeowners with access to hidden information may gain advantages in lowering their tax bills. This issue has prompted legislative action in several states and raises questions about fairness in property taxation and market transparency.
Private real estate listings combined with state nondisclosure laws—which already withhold sale prices from public records—are creating significant challenges for property tax assessment. Researchers and tax professionals report that appraisal districts lack sufficient sales data to accurately determine home values, forcing them to rely on incomplete information including voluntary surveys, mortgage records, and mass-appraisal models. This information asymmetry particularly disadvantages newcomers and benefits those with access to hidden market data. A 2025 study by Sergio Gárate at Emory University found that nondisclosure states show higher rates of appraisal bias and increased mortgage default probability for financially constrained borrowers. The issue has prompted legislative responses in Washington, Connecticut, Wisconsin, and New York, with policymakers concerned that homeowners strategically withholding or selectively revealing sale information can manipulate their property tax assessments.
What's missing
The article does not provide specific details about the content or status of the New York proposal awaiting Governor Hochul's signature, nor does it explain the specific mechanisms of the laws passed in Washington, Connecticut, and Wisconsin. Additionally, while the article mentions a 2025 study by Gárate et al., it does not provide the study's full citation, methodology details, or the magnitude of the effects observed.
What different sources said
- New York PostRight
Why off-market home sales may be raising your property taxes
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