701—404.6(422) Determination of composite Iowa income. Because a composite return is filed on behalf of the nonresident partners, shareholders, employees, or beneficiaries, it must be based upon the tax year of the majority of its partners, shareholders, employees, or beneficiaries. The composite return must be filed on Form IA 1040C, “Composite Iowa Individual Income Tax Return.” Attach schedules as necessary to explain the return. For the purposes of this rule, federal income means federal ordinary income (loss) from trade or business activities plus those items of income which flow through separately less expense items which flow through separately to the partners, shareholders, or beneficiaries joining in the filing of a composite return.
	1.	Adjustments to federal income. For partnerships and trusts, make those adjustments to federal income set forth in Iowa Code section 422.7. For S corporations, make those adjustments to federal income set forth in Iowa Code section 422.35.
	2.	Apply the allocation and apportionment provisions of 701—Chapter 503 or rule 701—302.46(422) for allocation of compensation paid to nonresident employees of professional athletic teams.
	3.	Deduct one standard deduction equal to the amount allowed a single taxpayer, not to exceed the amount of income attributable to Iowa, for each nonresident partner, shareholder, employee, or beneficiary included in the composite return.
	4.	For tax years beginning on or after January 1, 1989, deduct an amount in lieu of a federal tax deduction based upon the following schedule.

0	—	$ 49,999	No deduction	
$ 50,000	—	$ 99,999	5% of net income attributable to Iowa	
$100,000	—	$199,999	10% of net income attributable to Iowa	
$200,000	 	and over	15% of net income attributable to Iowa	
	5.	A net operating loss carryback or carryforward is allowed. See 701—subrule 302.18(3). In lieu of a net operating loss carryback, the taxpayer may elect to carry the loss forward.
This rule is intended to implement Iowa Code section 422.13.
[Editorial change: IAC Supplement 11/2/22; Editorial change: IAC Supplement 10/18/23]