a. Definitions. For purposes of this subrule, the following definitions apply: "Imputed Iowa liability" means the specified business's Iowa net income after the application of the Iowa business activity ratio, if applicable, multiplied by the applicable tax rate for the tax year, less any Iowa tax credits available to be claimed by the specified business in the current year. The applicable tax rate is:
1. In the case of an entity taxed as a C corporation, the top corporation income tax rate under Iowa Code section 422.33,2. In the case of a financial institution as defined in Iowa Code section 422.61, the franchise tax rate under Iowa Code section 422.63, or3. In the case of an entity taxed as an S corporation or partnership, the top individual income tax rate under Iowa Code section 422.5A."Income return" includes an Iowa corporation income tax return (IA 1120), an Iowa franchise tax return (IA 1120F), an Iowa S corporation income tax return (IA 1120S), and an Iowa partnership income tax return (IA 1065).
"Specified business" means any of the following:
1. An entity taxed as a C corporation that is required to file an Iowa corporation income tax return (IA 1120). This includes a consolidated group of corporations electing or required to file an Iowa consolidated return under Iowa Code section 422.37.2. An entity taxed as an S corporation that is required to file an Iowa S corporation income tax return (IA 1120S).3. A financial institution that is required to file an Iowa franchise tax return (IA 1120F).4. An entity taxed as a partnership that is required to file an Iowa partnership income tax return (IA 1065).