If a term used in sections 718.80 to 718.95 of the Revised Code that is not otherwise defined in this chapter is used in a comparable context in both the laws of the United States relating to federal income tax and in Title LVII of the Revised Code and the use is not consistent, then the use of the term in the laws of the United States relating to federal income tax shall have control over the use of the term in Title LVII of the Revised Code, unless the term is defined in Chapter 5703. of the Revised Code, in which case the definition in that chapter shall control. Any reference in this chapter to the Internal Revenue Code includes other laws of the United States related to federal income taxes. If a term is defined in both this section and section 718.01 of the Revised Code, the definition in this section shall control for all uses of that term in sections 718.80 through 718.95 of the Revised Code.
As used in sections 718.80 to 718.95 of the Revised Code only:
If the taxpayer is not a C corporation, is not a disregarded entity that has made the election described in division (L)(2) of section 718.01 of the Revised Code, and is not a publicly traded partnership that has made the election described in division (D)(5) of section 718.01 of the Revised Code, the taxpayer shall compute adjusted federal taxable income under this section as if the taxpayer were a C corporation, except guaranteed payments and other similar amounts paid or accrued to a partner, former partner, shareholder, former shareholder, member, or former member shall not be allowed as a deductible expense unless such payments are a pension or retirement benefit payment paid to a retired partner, retired shareholder, or retired member or are in consideration for the use of capital and treated as payment of interest under section 469 of the Internal Revenue Code or United States treasury regulations. Amounts paid or accrued to a qualified self-employed retirement plan with respect to a partner, former partner, shareholder, former shareholder, member, or former member of the taxpayer, amounts paid or accrued to or for health insurance for a partner, former partner, shareholder, former shareholder, member, or former member, and amounts paid or accrued to or for life insurance for a partner, former partner, shareholder, former shareholder, member, or former member shall not be allowed as a deduction.
Nothing in division (B) of this section shall be construed as allowing the taxpayer to add or deduct any amount more than once or shall be construed as allowing any taxpayer to deduct any amount paid to or accrued for purposes of federal self-employment tax.
R.C. § 718.81