Policy-based SAF CIs were calculated according to methods specified by the four policies. In the case of the RFS and 45Z credit, which generally do not allow for producer-specific CIs to be used, predetermined CIs developed by program administrators were used as the policy-based CIs. For the CFR and LCFS, policy-based CIs were calculated according to the methods specified by the policies (to the greatest extent possible given current data and model availability and the use of simulated biorefinery operation data). Policy-based CIs for all four policies are detailed further in SI Section S1.1.