Social Security has been moving toward a financial shortfall for years, but new projections suggest the timeline is accelerating. Updated estimates indicate the trust fund could be depleted by 2032, at which point benefits would be reduced by roughly 22 percent unless Congress enacts changes. Lawmakers have long understood the challenge, yet reforms that involve benefit reductions, tax increases, or both have largely been postponed.
A bipartisan proposal from Senators Bill Cassidy of Louisiana and Tim Kaine of Virginia aims to preserve scheduled benefits without raising taxes. Instead, it would rely on large-scale federal borrowing and long-term investment in the stock market. Supporters argue this approach could close Social Security’s funding gap, while critics warn it introduces substantial financial risk.
Warning
Social Security operates primarily on a pay-as-you-go basis. Payroll taxes collected from current workers are used to pay benefits to today’s retirees. For several years, those taxes have not fully covered benefit payments, and the trust fund has made up the difference.
Once the trust fund is depleted, the program will be limited to distributing only the revenue it collects each year. That constraint explains why projections show an automatic benefit reduction of about 22 percent beginning in 2032 if no legislative changes occur.
Proposal
The Cassidy-Kaine plan seeks to avoid benefit cuts and tax increases by creating a federal investment fund. Under the proposal, the government would borrow $1.5 trillion and invest it in stocks and other risk assets. The expectation is that higher long-term returns would outperform Treasury bonds over time.
In addition, the federal government would borrow another $25.1 trillion over 75 years to cover the gap between Social Security revenue and benefit payments. In total, the plan would add approximately $26.6 trillion in new debt. Returns from the investment fund would be used to repay that borrowing over time.
Assumptions
The proposal assumes long-term stock market performance similar to historical averages. Specifically, it uses a real return assumption of 6.5 percent per year after inflation. If achieved consistently over 75 years, that return could grow the initial investment fund to about $30.6 trillion.
However, long-term averages do not account for market volatility. Actual returns vary significantly year to year, and periods of underperformance can have lasting effects when large amounts of debt are involved.
Reality
Researchers at Boston College’s Center for Retirement Research evaluated the proposal using probabilistic simulations that incorporate market volatility. Their findings suggest the plan would not reliably generate enough investment returns to offset the additional debt.
Even using the 6.5 percent real return assumption, the investment fund failed to cover the borrowing in about 64 percent of simulations. When a more conservative 4 percent real return was used, the failure rate increased to 83 percent.
| Real Return Assumption | Failure Rate |
|---|---|
| 6.5% | 64% |
| 4.0% | 83% |
The researchers noted that many financial institutions expect future stock returns to fall below historical averages, which would further weaken the plan’s outlook.
Debt
The scale of borrowing required by the proposal raises additional concerns. Total U.S. federal debt is approximately $39 trillion, and publicly held debt is near 100 percent of gross domestic product. Adding trillions more in borrowing could put upward pressure on interest rates.
Higher interest rates could increase the cost of servicing federal debt and potentially reduce stock market valuations. According to the Boston College analysis, the most likely long-term outcome is that the government would still hold substantial debt after 75 years, along with significant interest obligations.
Alternative
The researchers did not dismiss the use of equities altogether. Instead, they suggested that a more balanced reform could combine moderate tax increases or benefit adjustments with partial investment of the trust fund in stocks.
Their analysis found that allocating roughly 40 percent of the trust fund to equities, while addressing the underlying funding shortfall, would keep Social Security solvent indefinitely in most scenarios. This approach would reduce reliance on debt and limit exposure to market risk.
Accounts
Investment-based approaches to retirement security have also appeared in other policy discussions. Senator Ted Cruz has described Trump accounts for children as a potential step toward personal retirement accounts. These tax-advantaged accounts allow funds to be invested and grow over time, similar to Australia’s superannuation system.
Cruz has argued that widespread participation in such accounts could build support for redirecting a portion of payroll taxes into personal investments. However, because current payroll taxes fund existing retirees, any diversion would require alternative financing. That issue has not yet been addressed in detail.
For now, Trump accounts are expected to function alongside existing retirement plans, similar to 401k accounts, often with employer contributions.
Choice
The challenge facing Social Security is fundamentally a question of trade-offs. Policymakers can reduce benefits, increase taxes, accept greater investment risk, or pursue a combination of all three. Proposals that rely heavily on borrowing and optimistic market assumptions may avoid difficult decisions in the short term, but they also introduce new uncertainties.
As lawmakers debate reform options, the central issue remains whether long-term retirement security should depend on market performance or on more predictable structural changes.
FAQs
When could Social Security face benefit cuts?
Current projections point to reductions starting in 2032.
How much debt would the proposal add?
Roughly $26.6 trillion over 75 years.
Why invest Social Security in stocks?
Stocks may offer higher long-term returns than bonds.
What is the main risk of this approach?
Market returns may not cover the added debt.
