Notice 2021-01 provides that, while subject to a delay, private foundations must electronically file Form 4720, Return of Certain Excise Taxes Under Chapters 41 and 42 of the Internal Revenue Code, as required by section 3101 of the Taxpayer First Act of 2019 (Pub. L. No. 116-25) which amended section 6033 of the Internal Revenue Code.  Until the electronic Form 4720 is made available, private foundations may continue to use the paper form.  Private foundations may no longer rely on Treas. Reg. § 53.6011-1(c), which allowed for certain joint filers of the Form 4720, as a result of this electronic filing mandate.

Notice 2021-01 will be in IRB:  IRB 2021-02, dated January 11, 2021.