Using the Dynamic Simulation of Income Model, we project how Social Security benefits and payroll taxes would change were Congress to enact the National Commission on Fiscal Responsibility and Reforms proposal. We show benefits at several points in time and relative to pre-retirement income, a low-income standard, and lifetime payroll tax contributions. The proposals projected effects are particularly deep relative to current law scheduled for those reaching retirement in several decades. Projected benefit reductions relate closely to lifetime earnings: Lower earners are largely shielded, higher earners face significant reductions. Projections are sensitive to workers assumed responses to certain proposal provisions.