Harris County Tax Office Forms ; Vehicle Registration Forms. MV-506. Pdf, Emissions - testing regulations ; Property Tax Forms. TaxCertRequest.Overview. One of the primary responsibilities of the Office of Annette Ramirez, Harris County Tax Assessor-Collector, is to collect and disburse property taxes. 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. You may look up your tax bill online at hctax. Net or contact the Tax Office and Appraisal District to update contact information. The Tax Office accepts full or partial payment of property taxes online.