26 C.F.R. § 1.261-1 General rule for disallowance of deductions.
Title 26 - Internal Revenue
In computing taxable income, no deduction shall be allowed, except as otherwise expressly provided in Chapter 1 of the Code, in respect of any of the items specified in Part IX (section 262 and following), Subchapter B, Chapter 1 of the Code, and the regulations thereunder.
Title 26: Internal Revenue
PART 1—INCOME TAXES
Items Not Deductible
§ 1.261-1 General rule for disallowance of deductions.