Code of Federal Regulations Title 26. Internal Revenue § 26.53.6651–1 Failure to file tax return or to pay tax

(b) Special rule where foundation files return.(1) Except as provided in paragraph (b)(2) of this section, in the case of tax imposed by section 4941(a)(1) on any disqualified person, reasonable cause shall be presumed, for purposes of section 6651(a)(1), where the private foundation or trust described in section 4947(a)(2) files a return in good faith and such return indicates no tax liability with respect to such tax on the part of such disqualified person.

(2) Paragraph (b)(1) of this section shall not apply where the disqualified person knew of facts which, if known by the foundation, would have precluded the foundation from making the return, as filed, in good faith.