Who Must File a Personal Property Declaration with the Assessor? The BPP Portal is closed until 2025.Request to have personal property taxes billed in installments. This form can be printed from PDF format. The Tax Collector's Office is responsible for collecting Real Estate taxes for all properties in Clark Township. Commonly Requested Forms The Assessor's Office makes a number of forms available to property owners and taxpayers to manage their property. Search tax forms and instructions. Department of Revenue at 406-444-4000 for further information. All tax bills are mailed 20 to 25 days before the due date. The Clark County Assessor's Office locates, identifies, and appraises all taxable property accurately, uniformly, and equitably in accordance with Indiana law.