Idaho Enacts New IRC Conformity Date

Idaho has moved its IRC conformity date to December 21, 2017, for tax years that begin after 2016. Legislation changing the IRC conformity date was signed by Governor C.L. “Butch” Otter. Before the legislative change, the IRC conformity date was January 1, 2017.

Different IRC Conformity Date for Certain Deductions

However, the state’s conformity date is changed to December 31, 2017, for:

  • the IRC Sec. 965 temporary dividends received deduction; and
  • the IRC Sec. 213 personal income tax deduction for medical expenses.

Corporate Income Tax Addbacks

The legislation also requires a corporate income tax addback for:

  • amounts deducted under IRC 965; and
  • other special deductions.

Ch. 3 (H.B. 355), Laws 2018, effective retroactive to January 1, 2018

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