This bill amends the Internal Revenue Code of 1986 to clarify the nature of federal income tax exemptions for specific entities. It explicitly states that exemptions from federal income taxes for organizations described in Sections 501(c), 501(d), or 401(a) are not to be treated as "Federal financial assistance" for the purposes of any federal law, rule, or regulation, unless explicitly provided otherwise. This provision aims to prevent tax-exempt status from being interpreted as direct federal funding, which could trigger additional regulatory burdens or obligations typically associated with receiving government grants or aid. The bill also includes a rule of construction clarifying that this amendment does not imply that such exemptions constituted federal assistance prior to the act's enactment, thereby preventing any retroactive application of this interpretation.