(G)
a corporation, partnership, or trust or estate of which (or in which) 50 percent or more of—
(i)
the combined voting power of all classes of stock entitled to vote or the total value of shares of all classes of stock of such corporation,
(ii)
the capital interest or profits interest of such partnership, or
(iii)
the beneficial interest of such trust or estate,
is owned directly or indirectly, or held by persons described in subparagraph (A), (B), (C), (D), or (E);
The Secretary, after consultation and coordination with the Secretary of the Treasury, may by regulation prescribe a percentage lower than 50 percent for subparagraph (E) and (G) and lower than 10 percent for subparagraph (H) or (I). The Secretary may prescribe regulations for determining the ownership (direct or indirect) of profits and beneficial interests, and the manner in which indirect stockholdings are taken into account. Any person who is a party in interest with respect to a plan to which a trust described in section
501
(c)(22) of title
26 is permitted to make payments under section
1403 of this title shall be treated as a party in interest with respect to such trust.