Section 53.4952-1 - Black lung trusts-taxes on taxable expenditures(a)In general. Section 4952 contains provisions that generally correspond to provisions of section 4945 (relating to taxes on taxable expenditures by private foundations) and section 4946 (relating to definitions and special rules). Regulations and rulings under these corresponding provisions apply to section 4952 where appropriate. See section 4952(e)(1) for the definition of correction.(b)Unauthorized investments. The term "taxable expenditure" in section 4952(d) includes an investment that is not authorized under section 501(c)(21)(B)(ii).(c)Effective date. Section 4952 applies with respect to expenditures made after December 31, 1977, in and for trust taxable years beginning after December 31, 1977.