Experts Warn Trust Fund Depletion Could Trigger Higher Interest Rates, Larger Deficits
Failing to reform Social Security before its trust fund runs dry could have consequences far beyond retirees, potentially disrupting financial markets, driving up borrowing costs and weakening the broader U.S. economy, according to a new study.
Researchers at George Mason University’s Mercatus Center warned that postponing Social Security reform until the trust fund is nearly exhausted would significantly increase the federal government’s financing needs, forcing large-scale Treasury borrowing that could ripple throughout the economy.
The warning follows the latest annual Social Security trustees report, which projects that the Old-Age and Survivors Insurance (OASI) Trust Fund will be depleted in the fourth quarter of 2032, three months earlier than previously expected. Once the trust fund is exhausted, Social Security would only be able to pay about 78% of scheduled retirement benefits unless Congress acts.
The researchers emphasized that the issue extends well beyond reduced benefits for retirees. If lawmakers fail to enact reforms in time, the federal government may have to rely on general revenues or additional borrowing to finance Social Security obligations, placing enormous pressure on the nation’s fiscal position.
While combining the OASI and Disability Insurance (DI) trust funds could postpone depletion until the third quarter of 2034, the study describes such a move as only a temporary solution rather than a long-term fix.
According to the report, Social Security’s annual cash shortfall could grow from approximately $600 billion in 2033 to nearly $700 billion by 2036, adding to already large federal deficits and the nation’s growing debt burden.
The researchers argue that financing those shortfalls through additional Treasury borrowing would increase the supply of government debt, likely pushing Treasury yields higher. Rising government borrowing costs would then spill over into the private sector, making mortgages, auto loans, business loans and other forms of credit more expensive.
The report also warns that if investors begin to question the federal government’s long-term fiscal sustainability, inflationary pressures could intensify as confidence in U.S. public finances weakens.
The bipartisan Committee for a Responsible Federal Budget (CRFB) reached similar conclusions. The organization estimates that if Social Security benefits were financed through general government revenues instead of dedicated payroll taxes, the yield on the 10-year Treasury note could climb from roughly 4% to 6.6%. In turn, the average 30-year fixed mortgage rate could rise from about 6.3% to nearly 9%, substantially increasing borrowing costs for American households.
Such an outcome would not only affect retirees but could significantly slow private investment, weaken consumer spending and make homeownership less affordable. Economists warn that recovering from such financial strain could take years.
Veronique de Rugy, senior research fellow at the Mercatus Center and one of the report’s co-authors, said the early 2030s could become a turning point for the nation’s fiscal health if lawmakers continue to delay action.
“The depletion of the Social Security trust fund could become the inflection point for a broader fiscal crisis,” she said, urging Congress to enact reforms well before the trust fund reaches insolvency.
Social Security is primarily financed through payroll taxes paid by workers and employers. For decades, surplus payroll tax revenue accumulated in the trust funds has been used to supplement benefit payments. Once those reserves are exhausted, however, policymakers will face difficult choices between reducing benefits, raising taxes, increasing borrowing or adopting a combination of reforms.
Many economists argue that earlier action would provide greater flexibility and reduce the economic costs of reform. Gradually increasing the retirement age, strengthening protections for lower-income retirees, encouraging additional private retirement savings and modernizing benefit formulas are among the proposals frequently discussed.
Experts agree that Social Security remains the primary source of retirement income for millions of Americans. Rather than waiting until the trust funds approach insolvency, they say Congress should pursue bipartisan reforms that preserve the program’s long-term financial stability while minimizing the risks to the broader U.S. economy.
