Alexander Gelber, Louise Sheiner
Policymakers have contemplated multiple Social Security reform plans as the combined OASDI Trust Fund approaches depletion in 2034, when tax revenues will fund only 81% of scheduled benefits. The authors argue that as the depletion date approaches without meaningful reform efforts, general revenue financing for Social Security - at least for a period of time - becomes increasingly likely. The magnitude of required adjustments far exceeds historical precedent: restoring 75-year solvency would require an immediate and permanent 22% benefit cut or 29% payroll tax increase (3.65% points). Absent reform, benefits would be cut by 19% upon depletion in 2034, rising to 28% by 2099. Since 1977, the maximum benefit decrease averaged across all beneficiaries has been just 0.7%, while the payroll tax rate has remained fixed at 12.4% since 1990. Using novel stochastic simulations, the authors demonstrate that even reforms eliminating the 75-year actuarial deficit would leave the system vulnerable to repeated depletion threats. Without building a substantial buffer stock - requiring even larger changes than typically proposed - Social Security faces a 40-50% probability of Trust Fund exhaustion within decades under plausible economic scenarios. The authors present implementation options for using general revenues, including temporary versus permanent financing mechanisms and redirecting existing revenue streams. They provide a conceptual analysis of the efficiency and equity consequences, weighing intergenerational fairness and political sustainability against otherwise unavoidable benefit disruptions.