Carbon pricing offers a cost-effective way to reduce greenhouse gas emissions. Fourteen states are already pricing carbon, and a number of states are considering similar action. This factsheet summarizes and compares nine federal carbon pricing proposals that have been introduced in the 117th Congress (2021–2022), highlighting similarities and differences. Six of these proposals would establish a carbon tax (or “carbon fee”), one of these proposals would establish a cap-and-dividend (i.e., cap-and-trade) program, and two of these proposals would establish a charge on methane emissions (i.e., methane fee). The nine proposals are: