However, the preceding sentence shall not apply to a transaction involving a dealer who is a disqualified person acting as a principal or to a transaction which is an act of self-dealing pursuant to section 4941(d)(1)(B) and § 53.4941(d)-2 (c)(1) . The tax imposed by section 4941(a)(1) is at the rate of 5 percent of the amount involved (as defined in section 4941(e)(2) and § 53.4941(e)-1(b) ) with respect to the act of self-dealing for each year or partial year in the taxable period (as defined in section 4941(e)(1)) and shall be paid by any disqualified person (other than a foundation manager acting only in the capacity of a foundation manager) who participates in the act of self-dealing. However, if a foundation manager is also acting as a self-dealer, he may be liable for both the tax imposed by section 4941(a)(1) and the tax imposed by section 4941(a)(2).
The tax imposed by section 4941(a)(2) is at the rate of 21/2 percent of the amount involved with respect to the act of self-dealing for each year or partial year in the taxable period and shall be paid by any foundation manager described in subdivisions (ii) and (iii) of this subparagraph.
For purposes of this part and Chapter 42, the term "knowing" does not mean "having reason to know". However, evidence tending to show that a person has reason to know of a particular fact or particular rule is relevant in determining whether he had actual knowledge of such fact or rule. Thus, for example, evidence tending to show that a person has reason to know of sufficient facts so that, based solely upon such facts, a transaction would be an act of self-dealing is relevant in determining whether he has actual knowledge of such facts.
26 C.F.R. §53.4941(a)-1