Harris County Tax Office Forms ; Vehicle Registration Forms. MV-506. Pdf, Emissions - testing regulations ; Property Tax Forms. TaxCertRequest.Fill out form 41.44, Property Appraisal – Notice of Protest, under FORMS > POPULAR FORMS on the HCAD website. The forms listed below are PDF files. They include graphics, fillable form fields, scripts and functionality that work best with the free Adobe Reader. Which forms will I need to file? For Harris County Appraisal District, most businesses will need to file the general rendition form, 22.15. Is it difficult to file a BPP rendition? Business Personal Property tax is an ad valorem tax on the tangible personal property that is used for the production of income. Original tax certificates are required, according to Texas Property Code 12.002(e).