There is hereby imposed a tax on each act of self-dealing between a disqualified person and a private foundation. The rate of tax shall be equal to 10 percent of the amount involved with respect to the act of self-dealing for each year (or part thereof) in the taxable period. The tax imposed by this paragraph shall be paid by any disqualified person (other than a foundation manager acting only as such) who participates in the act of self-dealing. In the case of a government official (as defined in section
4946
(c)), a tax shall be imposed by this paragraph only if such disqualified person participates in the act of self-dealing knowing that it is such an act.