Section 53.6651-1 - Failure to file tax return or to pay tax(a)General rules. For general rules relating to the failure to file tax return or to pay tax, see the regulations under section 6651 contained in part 301 of this chapter (Regulations on Procedure and Administration).(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.