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Vertical Equity – Skagit Style

Vertical equity is a core principle of property tax fairness, ensuring that higher- and lower-value properties are assessed consistently relative to one another. This session examines vertical equity within the context of mass appraisal, focusing on how assessment outcomes can diverge across value ranges even when overall ratio performance appears acceptable.

Participants will review how vertical equity is measured using ratio studies segmented by value strata, including common indicators such as regressivity and progressivity. The session will explore practical causes of vertical inequity, including market volatility, model limitations, cost table structures, and data constraints. Real-world examples from county assessment practice will be used to illustrate how vertical inequity can emerge and how it can be identified through targeted analysis.

The presentation will also highlight tools and approaches used to evaluate vertical equity, including decile-based ratio analysis and external benchmarking resources. Emphasis is placed on translating statistical findings into actionable appraisal strategies that improve equity while remaining compliant with statutory assessment requirements.

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