26 CFR § 1.531-1 - Imposition of tax.

---
identifier: "/us/cfr/t26/s1.531-1"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "26 CFR § 1.531-1 - Imposition of tax."
title_number: 26
title_name: "Internal Revenue"
section_number: "1.531-1"
section_name: "Imposition of tax."
chapter_name: "INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY"
subchapter_number: "A"
subchapter_name: "INCOME TAX"
part_number: "1"
part_name: "INCOME TAXES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "26 U.S.C. 7805, unless otherwise noted."
regulatory_source: "T.D. 6500, 25 FR 11402, Nov. 26, 1960; 25 FR 14021, Dec. 21, 1960; T.D. 9989, 89 FR 17606, Mar. 11, 2024, unless otherwise noted."
cfr_part: "1"
---


# 1.531-1 Imposition of tax.

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.

(Secs. 1502 and 7805 of the Internal Revenue Code of 1954 (68A Stat. 637, 917; 26 U.S.C. 1502, 7805))

[T.D. 6500, 25 FR 11737, Nov. 26, 1960, as amended by T.D. 7244, 37 FR 28897, Dec. 30, 1972; T.D. 7937, 49 FR 3462, Jan. 27, 1984]