Section 531 imposes (in addition to the other taxes imposed upon corporations by chapter 1 of the Code) a graduated tax on the accumulated taxable income of every corporation described in section 532 and § 1.532-1 . In the case of an affiliated group which makes or is required to make a consolidated return see § 1.1502-43 . All of the taxes on corporations under chapter 1 of the Code are treated as one tax for purposes of assessment, collection, payment, period of limitations, etc. See section 535 and §§ 1.535-1 , 1.535-2 , and 1.535-3 for the definition and determination of accumulated taxable income.
26 C.F.R. §1.531-1
Secs. 1502 and 7805 of the Internal Revenue Code of 1954 (68A Stat. 637, 917; 26 U.S.C. 1502 , 7805 )