What Evidence You Need to Win Your Property Tax Appeal

Most tribunals and boards of revision want to see at least two to three years of income and expense statements, and five years can be helpful for properties with unusual history or recent stabilization issues. The goal is to show trends over time and demonstrate that your numbers are consistent, not just a one-year anomaly driven by a large non-recurring expense or a single tenant default. Clean trailing-12 operating statements, rent rolls, and general ledger extracts are the strongest starting point. Our commercial assessment guide explains how assessors use this data in their own models, which helps you decide what to submit.

Yes — a professional appraisal from a licensed MAI appraiser can be powerful evidence, and in larger commercial cases it is often the single most persuasive item in the package. That said, the appraisal must be conducted according to USPAP standards and use a methodology the tribunal or board will accept, and it must be specifically for tax appeal purposes rather than a mortgage or acquisition appraisal. Not all appraisals are created equal — one that uses the wrong approach, outdated comparables, or inconsistent assumptions can actually hurt your case by giving the assessor new ammunition. When EPTA determines an MAI appraisal is needed, we coordinate it as part of the engagement. See our appeal process guide for where appraisals fit in the overall timeline.

When comparable sales are limited — common for specialized properties like medical facilities or industrial plants — the income approach becomes even more important. For big-box retail and large format properties, the dark store theory offers an evidence framework that reframes how comparables are selected. Your actual income and expense data, combined with market cap rates, can establish value without relying on comparable sales.

For larger commercial properties or cases heading to a formal tribunal hearing, an expert witness — typically an MAI appraiser — significantly strengthens your case and is sometimes effectively required by the tribunal. For smaller cases, informal board hearings, or matters that settle in negotiation before reaching a hearing, well-organized financial data and comparable sales may be enough. The break-even tends to fall around the dollar size of the potential reduction: if the expected savings clearly exceed expert witness costs, professional testimony is usually worth it. On contingency engagements, EPTA covers qualified expert costs directly. Our appeal cost guide explains how those expenses are typically handled, and our appeal success rate guide shows how evidence-driven cases tend to resolve.

Assessors will cite their own comparable sales, mass appraisal cost tables, and market data drawn from broad regional surveys rather than your specific submarket. They may also point to your property's sale price if you purchased recently — which is particularly common in post-purchase appeal situations — any improvements you've made, or higher rental rates at nearby properties. Knowing what the assessor will argue helps you prepare effective counter-evidence and anticipate objections before the hearing. Our assessment guide walks through the standard methodologies assessors rely on so you can address them directly.