26 USC 6700 - Promoting abusive tax shelters, etc.
Any person who
shall pay, with respect to each activity described in paragraph (1), a penalty equal to the $1,000 or, if the person establishes that it is lesser, 100 percent of the gross income derived (or to be derived) by such person from such activity. For purposes of the preceding sentence, activities described in paragraph (1)(A) with respect to each entity or arrangement shall be treated as a separate activity and participation in each sale described in paragraph (1)(B) shall be so treated. Notwithstanding the first sentence, if an activity with respect to which a penalty imposed under this subsection involves a statement described in paragraph (2)(A), the amount of the penalty shall be equal to 50 percent of the gross income derived (or to be derived) from such activity by the person on which the penalty is imposed.
For purposes of this section, the term gross valuation overstatement means any statement as to the value of any property or services if
The Secretary may waive all or any part of the penalty provided by subsection (a) with respect to any gross valuation overstatement on a showing that there was a reasonable basis for the valuation and that such valuation was made in good faith.
The penalty imposed by this section shall be in addition to any other penalty provided by law.