This bill, known as the "Solid American Hardwood Tax Credit Act," proposes to amend the Internal Revenue Code of 1986 by expanding the existing energy efficient home improvement credit. Its primary purpose is to introduce a new credit for natural carbon sink expenditures , encouraging the use of specific domestically sourced materials in residential construction and renovation. The legislation defines "natural carbon sink expenditures" as costs associated with installing certain products on a taxpayer's principal residence, provided they are new and expected to last at least five years. A "natural carbon sink" is specifically identified as flooring, paneling, millwork, cabinetry, windows, or skylights made from deciduous trees grown and processed in the United States . Furthermore, the bill extends the availability of this modified credit, pushing its expiration date from 2032 to 2035, thereby providing a longer incentive for these improvements.