(a) In general. Returns required by §156.6011-1 (relating to liability for tax on greenmail under section 5881) shall be filed on or before the ninetieth day following receipt of any portion of the greenmail. Greenmail is considered to be received when gain or other income is realized, as determined according to the taxpayer's method of accounting, without regard to any provision of the Code providing for deferral of recognition.

(b) Returns relating to greenmail received before the date these regulations become final. Returns required by §156.6011-1 that relate to greenmail received on or before December 18, 1991, shall be filed on or before March 18, 1992.