The main purpose of this legislation, known as the "No Bias in the Baseline Act," is to clarify how the federal budget baseline is calculated. The baseline is essentially a reference point used to project future budget authority, spending, and revenues based on current laws. This act aims to ensure that future budget projections are based on existing laws and the assumption that current levels of discretionary spending will continue, without adjustments for inflation or other factors. Key provisions of the act include significant changes to how the baseline calculation is defined.