See section 4941(d)(2)(F) and §§ 53.4941(d)-1(b)(3) , 53.4941(d)-3 (d)(1) and 53.4941(d)-4(b) . Thus, for example, if a corporation which is a disqualified person with respect to a private foundation recapitalizes in a transaction which would be described in section 4941(d)(2)(F) but for the fact that the private foundation receives new stock worth only $95,000 in exchange for the stock which it previously held in the corporation and which has a fair market value of $100,000 at the time of the recapitalization, the amount involved would be $5,000 ($100,000-$95,000) if there had been a good faith attempt to value the stock. Similarly, if an estate enters into a transaction with a disqualified person with respect to a foundation and such transaction would be described in § 53.4941(d)-1(b)(3) but for the fact that the estate receives less than fair market value for the property exchanged, the amount involved is the excess of the fair market value of the property the estate transfers to the disqualified person over the money and the fair market value of the property received by the estate.
In applying (a) of this subdivision the fair market value of the use of property shall be the higher of the rate (that is, fair rental value per period in the case of use of property other than money or fair interest rate in the case of use of money) at the time of the act of self-dealing (within the meaning of paragraph (e)(1) of this section) or such rate at the time of correction of such act of self-dealing. In applying (b) of this subdivision the fair market value of the use of property shall be the rate at the time of correction.
In applying (a) of this subdivision the fair market value of the use of property shall be the lesser of the rate (that is, fair rental value per period in the case of use of property other than money or fair interest rate in the case of use of money) at the time of the act of self-dealing (within the meaning of paragraph (e)(1) of this section) or such rate at the time of correction of such act of self-dealing. In applying (b) of this subdivision the fair market value of the use of property shall be the rate at the time of correction.
Example. Assume the same facts as in example (5) of paragraph (b)(4) of this section. Such transaction shall be considered as corrected by a payment of $5,000 by M to V, together with an additional payment to V of an amount equal to the interest which V could have obtained on $5,000 for the period commencing on the date of the redemption and ending on the date the act is corrected.
26 C.F.R. §53.4941(e)-1