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Sophie Shin is a Senior Economist at the Penn Wharton Budget Model, where she leads analysis of Social Security policy and long-term program finances. She joined PWBM in 2015 after earning her Ph.D. in Economics from the University of Pennsylvania. At PWBM, her work focuses on large-scale economic modeling and microsimulation, including the development of the Social Security model. She has authored and contributed to numerous policy briefs on Social Security reform and program solvency. Her research interests include labor economics, family economics, demography, and microsimulation. She earned her B.A. in Economics from Korea University.
PWBM projects that Social Security's combined trust fund depletes in February 2035 with a 75-year shortfall of 4.65 percent of taxable payroll, close to the 2026 Trustees Report despite offsetting differences in fertility and mortality projections.
We project that Social Security's Old-Age and Survivors Insurance Trust Fund will deplete in six years (2032). We consider five different reform options that vary in the amount of tax increases and benefit cuts. Traditional policy analysis that dominates federal policymaking often provides very different — even opposite — insights compared to more comprehensive modeling.
The current Social Security program faces a significant shortfall, equal to 4.2 percent of all future covered payroll over the next 75 years. This shortfall persists under alternative and favorable projections of fertility, interest rates, immigration and the projected impact of AI on future wages.
Deporting unauthorized workers over 10 years cuts Social Security revenue, raises deficits by $133 billion (10 yrs) and $884 billion (30 yrs). The Trust Fund depletes 6 months earlier; 75-year deficit rises by 0.25% of payroll.
Eliminating taxes on Social Security benefits reduces incentives to save and work while increasing federal debt. Wages and GDP fall over time. The policy primarily benefits high-income households nearing or in retirement while harming households under thirty and all future generations across the entire income distribution.
A package of 13 major tax and spending reforms, based on standard public economics design principles, is shown to reduce federal debt, increase social insurance, and expand the economy more than any previously analyzed policies by PWBM.
Note: This document was updated on 5/21/2024 to include a conventional distributional analysis and a dynamic distributional analysis of the three policy bundles.
As part of PWBM’s “Democratizing the Budget Contest,” Andrew Biggs, Ph.D. proposed a package of Social Security reforms centered around gradually transitioning the program to a flat benefit for new retirees. PWBM projects that this proposal would reduce the program’s conventional 75-year imbalance by 2.44 percent of taxable payroll, leaving a remaining imbalance of 0.8 percent of current law taxable payroll. The proposal would decrease GDP by 0.6 percent in 2030 while increasing GDP by 0.6 percent in 2050.
