Most protests are resolved at the informal stage, but the ARB is your backup. Knowing the ARB exists gives you leverage in informal negotiations, because the appraiser knows you can escalate. If you do go to a formal hearing, present your evidence clearly and concisely. ARB members are volunteers, not appraisal experts, so keep your argument simple.
Official resource: https://comptroller.texas.gov/taxes/property-tax/protests/
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