The Historic Preservation Enhancement Act significantly increases and guarantees funding for the nation's historic preservation efforts. It amends title 54, United States Code, to raise the annual deposit into the Historic Preservation Fund (HPF) from $150 million to $300 million , making these funds available for expenditure without further appropriation or fiscal year limitation starting in fiscal year 2027. This legislation also ensures that if traditional revenues are insufficient, the difference will be drawn from the general fund of the Treasury, establishing a mandatory funding mechanism for the HPF. The bill establishes clear allocation requirements for the enhanced funds, mandating that not less than 40 percent of HPF amounts be allocated to State Historic Preservation Offices and not less than 20 percent to Tribal Historic Preservation Offices, with the latter adjusting for increases in recognized Tribal offices. The President is required to submit proposed allocations to Congress, which retains the authority to provide alternate allocations through appropriations acts, or the President will allocate the funds if Congress does not. Furthermore, the Act explicitly authorizes several key programs to receive funding from the Historic Preservation Fund, including the African American Civil Rights Movement Initiative & Grants, History of Equal Rights Grants, Survey Grants for Underrepresented Communities, and Paul Bruhn Historic Revitalization Grants.