The three low carbon fuel policies evaluated in this study share similar goals: to require the blending of fuels with lower greenhouse gas emissions (RFS; 29 see § 80.2), to prevent or reduce air pollution from fossil fuels (CFR; 30 see the Registration section), and to reduce the carbon intensity of transportation fuels (LCFS; 31 see § 95480). With regard to the 45Z tax credit, one of the primary goals of the Inflation Reduction Act of 2022 (P.L. 117-169) was to address climate change by incentivizing the growth of a clean energy economy: the 45Z tax credit was included by Congress to further incentivize the production of biofuels with lower carbon scores or GHG reductions. The three programs and the tax credit all specify methods to determine the CI of biofuels produced for program compliance, which includes quantifying the CI of producing the biomass feedstock used to produce the fuel (detailed in RFS § 80.1426, in CFR § 75-76, in LCFS § 95488.3, and in 45Z § (b)(1)(B)(iii)). All three programs and the tax credit utilize an LCA approach for CI quantification, with slight variations in scope; therefore, the policy, and the methods it specifies, have some influence in determining the CI that is calculated for a given biofuel from a given field. The methods specified by each policy were reviewed to highlight which policy choices might affect biofuel CI estimates. Attributes of policies considered include the use of site-specific data for each life cycle stage and any material and energy flows or other considerations that influence CI calculations.