Floor Packet Page No. 440 Amend CSHB 3 to add Subsection (D) to Section 21.02, Tax Code (D) This subsection does not apply to a drilling rig designed for offshore drilling or exploration operations. A mobile portable drilling rig, and equipment associated with the drilling rig, is taxable by the taxing unit in which the rig is located on January 1 if the rig was located in the unit for the preceding 365 consecutive days. If the rig and associated equipment was not located at its January 1 location for the preceding 365 days, it is taxable by the taxing unit in which the owner's principal place of business in this state is located on January 1.