Per IRS Publication 504 Divorced or Separated Individuals , page 5:
Itemized deductions. If you and your spouse file separate returns and one of you itemizes deductions, the other spouse can’t use the standard deduction and should also itemize deductions.
Dividing itemized deductions. You may be able to claim itemized deductions on a separate return for certain expenses that you paid separately or jointly with your spouse. See Table 1.
To report in the TaxAct program that your spouse itemized deductions (if you report this in the TaxAct program, itemized deductions will be reported on your Form 1040 U.S. Individual Income Tax Return even if the itemized deductions are less than the standard deduction):
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