For provisions with respect to interest due on amounts the payment of which is extended under section 6164, see section 6601 and paragraph (e) of Sec. 301.6601-1 of this chapter (Regulations on Procedure and Administration). For extensions of time under section 6164 in the case of corporations making or required to make consolidated returns, see Sec. 1.1502-77(a). [T.D. 6500, 25 FR 12140, Nov. 26, 1960, as amended by T.D. 7244, 37 FR 28897, Dec. 30, 1972]