Election

This paragraph shall not apply to any plan unless each employer maintaining the plan elects before the close of the 1st plan year beginning after December 31, 1989 , to have this subsection (other than paragraph (2)(G)).

An election under clause (i) may be revoked not later than the last day of the third plan year beginning after the date of the enactment of this clause. The revocation shall apply to all plan years to which the election applied and to all subsequent plan years. Any amount paid by a plan in a taxable year ending after the revocation shall be includible in income in such taxable year under the rules of this chapter in effect for such taxable year, except that, for purposes of applying the limitations imposed by this section, any portion of such amount which is attributable to any taxable year during which the election was in effect shall be treated as received in such taxable year.