Cost amounts are subject to audit. Cost should include installation, trade-in allowances, sales tax, investment credits, transportation, etc. 3.It prepares personal property tax returns. The appraisal staff shall identify personal property, determine its taxability, and classify it for addition to the county ad valorem tax digest. All assets are to be reported at the original cost new or replacement cost new. When reporting assets, be as detailed as possible to ensure accurate valuation. Property taxes are charged against the owner of the property on January 1 and against the property itself if the owner is not known. Business Personal Property assets must be reported on form PT-50P. The return is available on the forms and applications page or click here. Yes. All businesses located in Cobb County should report Business Personal Property assets regardless of value.