This bill introduces a new income tax credit, the National Scenic Trail conservation credit , to encourage the conservation of land along designated National Scenic Trails. It amends the Internal Revenue Code to allow taxpayers to claim a credit equal to the fair market value of a qualified conservation contribution that includes a National Scenic Trail or a portion thereof, along with its defined trail corridor. A "National Scenic Trail conservation contribution" is a qualified real property interest that encompasses a National Scenic Trail and its corridor, for which the taxpayer makes an election. The trail corridor is generally defined as 50 feet wide on each side of the trail, up to a maximum of 2,640 feet, with specific exceptions for existing property configurations. The fair market value of the contribution is determined by reference to the highest and best use of the real property, and the election to claim this credit is irrevocable. The credit is structured to apply as both a general business credit for trade or business property and a personal credit for other contributions, with unused credit amounts eligible for a 10-year carryforward. Importantly, continued recreational or agricultural use of the conserved land is permitted, provided it does not impair significant conservation interests or conflict with the National Trails System Act. The bill also mandates the Secretary of the Interior, in consultation with the Secretary of the Treasury, to conduct a study within four years on the credit's efficacy in expanding National Scenic Trails and the feasibility of making it refundable or transferable.