To pay your Property Taxes, please click below to be taken to the website of the Cook County Treasurer. Business, Non-Attorney Code Request Form.We assist property owners who wish to submit information for accurate valuations, apply for a tax incentive, and more. The Portal consolidates information and delivers Cook County taxpayers a one-stop customer service website. Taxpayers should use these forms and guides to apply for local tax abatements and exemptions and file property returns. Business Personal Property - eFiling Upload Form (Tax Year 2025). Complete Form PTAX-203-B, Illinois Real Estate Transfer Declaration Supplemental Form B. 11 Full actual consideration. All businesses are required to file annually a Declaration of Personal Property that lists the assets' original cost. Tax Return Form Code: Form 8402B (Business) Form 8402IN (individual) Form 8402CO (contractor) Form 8403 (Retailer). Business personal property deals with the physical assets used in the operation of the business.