In computing taxable income of individuals, there shall be deducted from net income the larger of the following amounts:
1. An optional standard deduction, after deduction of federal income tax, equal to one thousand two hundred thirty dollars for a married person who files separately or a single person or equal to three thousand thirty dollars for a husband and wife who file a joint return, a surviving spouse, or an unmarried head of household. The optional standard deduction shall not exceed the amount remaining after deduction of the federal income tax.
2. The total of contributions, interest, taxes, medical expense, nonbusiness losses, and miscellaneous expenses deductible for federal income tax purposes under the Internal Revenue Code, with the following adjustments:
a. Subtract the deduction for Iowa income taxes.
b. Add the amount of federal income taxes paid or accrued as the case may be, during the tax year, adjusted by any federal income tax refunds. Provided, however, that where married persons, who have filed a joint federal income tax return, file separately, such total shall be divided between them according to the portion thereof paid or accrued, as the case may be, by each.
c. Add the amount by which expenses paid or incurred in connection with the adoption of a child by the taxpayer exceed three percent of the net income of the taxpayer, or of the taxpayer and spouse in the case of a joint return. The expenses may include medical and hospital expenses of the biological mother which are incident to the child's birth and are paid by the taxpayer, welfare agency fees, legal fees, and all other fees and costs relating to the adoption of a child if the child is placed by a child- placing agency licensed under chapter 238 or by a person making an independent placement according to the provisions of chapter 600.
d. Add an additional deduction for mileage incurred by the taxpayer in voluntary work for a charitable organization consisting of the excess of the state employee mileage reimbursement over the amount deductible for federal income tax purposes. The deduction shall be proven by the keeping of a contemporaneous diary by the person throughout the period of the voluntary work in the tax year.
e. Add the amount, not to exceed five thousand dollars, of expenses not otherwise deductible under this section actually incurred in the home of the taxpayer for the care of a person who is the grandchild, child, parent, or grandparent of the taxpayer or the taxpayer's spouse and who is unable, by reason of physical or mental disability, to live independently and is receiving, or would be eligible to receive if living in a health care facility licensed under chapter 135C, medical assistance benefits under chapter 249A. In the event that the person being cared for is receiving assistance benefits under chapter 239B, the expenses not otherwise deductible shall be the net difference between the expenses actually incurred in caring for the person and the assistance benefits received under chapter 239B.
f. Add the amount of the mortgage interest credit allowable for the tax year under section 25 of the Internal Revenue Code to the extent the credit decreased the amount of interest deductible under section 163(g) of the Internal Revenue Code.
g. Reserved.
h. To the extent not otherwise included pursuant to section 164 of the Internal Revenue Code, add the amount of the annual registration fee paid for a multipurpose vehicle pursuant to section 321.124, subsection 3, paragraph "h", which is based upon the value of the vehicle. For purposes of this paragraph, sixty percent of the amount of the registration fee is based upon the value of the multipurpose vehicle.
i. If the taxpayer has a deduction for medical care expenses under section 213 of the Internal Revenue Code, the taxpayer shall recompute for the purposes of this subsection the amount of the deduction under section 213 by excluding from medical care, as defined in section 213, the amount subtracted under section 422.7, subsection 32.
3. If, after applying all of the adjustments provided for in section 422.7, the allocation provisions of section 422.8, and the deductions allowable in this section subject to the modifications provided in section 172(d) of the Internal Revenue Code, the taxable income results in a net operating loss, the net operating loss shall be deducted as follows:
a. The Iowa net operating loss shall be carried back three taxable years for an individual taxpayer with a casualty or theft property loss or for a net operating loss in a presidentially declared disaster area incurred by a taxpayer engaged in a small business or in the trade or business of farming. For all other Iowa net operating losses, the net operating loss shall be carried back two taxable years or to the taxable year in which the taxpayer first earned income in Iowa whichever year is the later.
b. The Iowa net operating loss remaining after being carried back as required in paragraph "a" of this subsection or if not required to be carried back shall be carried forward twenty taxable years.
c. If the election under section 172(b)(3) of the Internal Revenue Code is made, the Iowa net operating loss shall be carried forward twenty taxable years.
4. Where married persons file separately, both must use the optional standard deduction if either elects to use it.
5. A taxpayer affected by section 422.8 shall, if the optional standard deduction is not used, be permitted to deduct only such portion of the total referred to in subsection 2 above as is fairly and equitably allocable to Iowa under the rules prescribed by the director.
[C35, § 6943-f9; C39, § 6943.041; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, § 422.9; 82 Acts, ch 1023, § 9, 10, 30, 32, ch 1192, § 1, 2, ch 1226, § 4, 6]
83 Acts, ch 179, § 7, 22; 84 Acts, ch 1305, § 31; 87 Acts, ch 233, § 493; 87 Acts, 2nd Ex, ch 1, § 7-9; 88 Acts, ch 1028, §17-20; 89 Acts, ch 268, §5; 91 Acts, ch 159, § 9; 91 Acts, ch 210, § 2; 92 Acts, ch 1222, § 4, 6; 94 Acts, ch 1046, §9; 94 Acts, ch 1166, §4-6, 12; 95 Acts, ch 5, §2, 14; 96 Acts, ch 1168, § 1, 3; 97 Acts, ch 41, §32; 97 Acts, ch 135, §5, 9; 98 Acts, ch 1078, §5, 12
Referred to in § 422.4, 422.5, 422.7, 422.16, 422.21
Subsection 2, paragraph i, is effective January 1, 1996, for tax years beginning on or after that date; 95 Acts, ch 5, §14
1996 amendment striking former paragraph f from subsection 2 retroactive to January 1, 1996, for tax years beginning on or after that date; 96 Acts, ch 1168, § 3
Subsection 2, paragraph f applies retroactively to tax years beginning on or after January 1, 1996; 97 Acts, ch 135, §9
1998 amendment to subsection 3, paragraphs a-c applies retroactively to net operating losses and casualty losses arising in taxable years beginning after August 5, 1997; 98 Acts, ch 1078, §12
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