Iowa Admin. Code r. 701-502.1
Net income for state purposes shall mean federal taxable income, before deduction for net operating losses, as properly computed under the Internal Revenue Code, and shall include the adjustments in 701-53.2 (422) to 701-53.13 (422) and 701-53.17 (422) to 701-53.26 (422). The remaining provisions of this rule and 701-53.14 (422) to 701-53.16 (422) shall also be applicable in determining net income.
In the case of a corporation which is a member of an affiliated group of corporations filing a consolidated income tax return for the taxable year for federal income tax purposes, but files a separate return for state purposes, taxable income as properly computed for federal purposes is determined as if the corporation had filed a separate return for federal income tax purposes for the taxable year and each preceding taxable year for which it was a member of an affiliated group. For purposes of this paragraph, the taxpayer's separate taxable income shall be determined as if the election provided by Section 243(b)(2) of the Internal Revenue Code had been in effect for all those years.
When a federal short period return is filed and the federal taxable income is required to be adjusted to an annual basis, the Iowa taxable income shall also be adjusted to an annual basis. The tax liability for a short period is computed by multiplying the taxable income for the short period by 12 and dividing the result by the number of months in the short period. The tax is determined on the resulting total as if it were the taxable income, and the tax computed is divided by 12 and multiplied by the number of months in the short period. This adjustment shall apply only to income attributable to business carried on within the state of Iowa.
This rule is intended to implement Iowa Code section 422.35.
Iowa Admin. Code r. 701-502.1