Corporate income tax; taxable income; net operating loss. Provides that, beginning in taxable year 2027, for purposes of calculating the Virginia taxable income of corporations, federal income means any income taxable to the corporation under federal law for such year excluding net operating loss deductions under federal tax law. The bill also creates a Virginia corporate income tax net operating loss deduction, beginning in taxable year 2027, in an amount equal to the aggregate Virginia net operating losses for such taxable year, plus any transitional net operating loss deduction, pursuant to a calculation in the bill, and subject to certain other adjustments in the bill. The bill also prohibits a corporation's Virginia taxable income, after all other adjustments, allocation, and apportionment, from being reduced below zero by a Virginia net operating loss deduction. The bill also includes particular procedures for corporate income tax returns prepared on a consolidated or a combined basis. Finally, the bill directs the Department of Taxation to issue preliminary guidelines implementing the provisions of the bill and to cooperate with and seek counsel from interested stakeholders before issuing its final guidelines. The bill has a delayed effective date of January 1, 2027.