Although commercial property tax is supposed to be based on objective factors, tax appraisals can be wrong due to errors or misinterpreting facts. You should receive your Notice of Appraised Value in late April or May. Upon receiving a new value determination that you disagree with, contact your Appraisal District as soon as possible. The district grants a short window of time, mostly from May through July, to process protests before the new valuation becomes final.Your first step is to discuss the issue with the district. The district may acknowledge a mistake and fix it. If that fails, you need to file a Notice of Protest with the Appraisal Review Board. You may find it useful to speak with a property tax consultant in Dallas before making contact with the district.