26 CFR 55.6071-1: -1 Time for filing returns.

(a) Returns for calendar years beginning after December 31, 1986. A return required by § 55.6011-1 for any calendar year beginning after December 31, 1986, shall be filed on or before March 15 of the following calendar year. See § 55.6081-1 for rules relating to extensions of time for filing a return required by § 55.6011-1.

(b) Returns for excise tax under section 4981 as in effect before amendment by the Tax Reform Act of 1986. A return required by § 55.6011-1 for any excise tax under section 4981, as in effect before amendment by the Tax Reform Act of 1986, shall be filed at the time (including any extension of time granted or allowed under section 6081) that the real estate investment trust is required to file its income tax return under section 6012 for the taxable year for which the tax under section 4981, as in effect before amendment by the Tax Reform Act of 1986, is imposed.