Mortgage rates could spike if Congress doesn't act on Social Security problems
As mortgage rates linger near 6.5%, a new fiscal threat taking shape in Washington could add further pressure to housing affordability.
Research from George Mason University's Mercatus Center connects Social Security's funding crisis to the bond market dynamics that shape your mortgage rate.
The connection runs through the federal debt, a channel separate from the Federal Reserve's interest rate decisions that most borrowers have been watching.
Without a congressional fix before the retirement trust fund depletes in late 2032, the government could face hundreds of billions in new annual borrowing, the Mercatus Center research found.
That surge in Treasury issuance would push bond yields higher, and 30-year mortgage rates could climb from about 6.3% toward 9%, the Committee for a Responsible Federal Budget projected.
Bond investors would not wait for the trust fund to hit zero, because markets tend to reprice risk well ahead of fiscal deadlines, the researchers warned.
How the trust fund shortfall could affect mortgage payments
Social Security's Old-Age and Survivors Insurance trust fund will deplete its reserves in the fourth quarter of 2032, the latest trustees report confirmed.
At that point, ongoing payroll tax revenue would cover only 78% of scheduled benefits, leaving retirees with a 22% cut across all benefits.
Bond markets could begin repositioning as soon as 12 months out from the projected depletion date if Congress fails to act, Jason Fichtner, executive director at the LIMRA Retirement Income Institute told CNBC.
Financial markets may be pricing in a responsible congressional solution now, but if that expectation shifts toward large-scale borrowing, the correction will not come gradually, the researchers noted.
Related: AARP, Fidelity share major warning on Social Security, 401(k)s
The OASI trust fund's early-2030s depletion is "the inflection point that could lead to a fiscal crisis if legislative action is not taken beforehand," wrote Mercatus senior research fellow Veronique de Rugy and Fichtner.
The Committee for a Responsible Federal Budget modeled replacing Social Security payroll tax revenue with borrowed money to cover funding shortfalls.
Such borrowing could raise the neutral rate on 10-year Treasury bonds from 4.0% to roughly 6.6%, according to its 2025 research.
A 30-year fixed-rate mortgage would follow that trajectory, potentially rising from roughly 6.3% to close to 9%, the organization projected.
A $29.3 trillion gap with accelerating warning signs
The 2026 OASDI Trustees Report reveals a significantly worse financial picture than the year before, with the 75-year shortfall surging to $29.3 trillion from $25.1 trillion.
Three forces drove the deterioration: a lower fertility assumption and lower net immigration both point to a smaller future workforce, while the 2025 One Big Beautiful Bill Act reduced projected tax revenue flowing to the trust funds, the Bipartisan Policy Center explained
The Social Security Administration lowered its long-run fertility estimate from 1.9 children per woman to 1.75, reducing the projected future workforce that funds the system.
Immigration assumptions also fell, further shrinking the payroll tax base, and the 2025 One Big Beautiful Bill Act cut the trust fund's income tax revenue, the report confirmed.
More Social Security:
- Fidelity offers a lifeline to millions before Social Security shifts
- Social Security retirees could pocket a bigger 2027 raise
- Social Security's funds will run out sooner than expected
Mercatus research found that Social Security's annual funding gap will reach $600 billion by 2033 and grow to about $700 billion by 2036.
That gap would add to an already strained federal balance sheet, with the national debt projected to hit $46.5 trillion by 2033.
Early warning signals have already appeared in Treasury markets, with foreign holdings of U.S. government debt declining amid tariff-driven global uncertainty, Fichtner noted.
Inflation remains above the Federal Reserve's 2% target, and longer-maturity yields on Treasury Inflation-Protected Securities suggest investors expect elevated price growth to persist, Fichtner and de Rugy warned.
What proactive reform could mean for rates and the economy
The borrowing-driven rate spike is not inevitable, and the researchers argue that early action on Social Security could produce the opposite economic result.
Marc Goldwein, senior vice president at the Committee for a Responsible Federal Budget, told CNBC that structural reform could support faster economic growth.
"If we make smart choices, we can target Social Security benefits to those who need it and actually promote faster economic growth in the process," Goldwein said.
The committee's own 2019 reform proposal projected that a balanced fix could expand the economy's total output by 3.5% to 13% by 2050.
Any adjustments to Social Security may change incentives to save, invest, and work, Goldwein told CNBC.
For homebuyers tracking 30-year rates in the mid-6% range, the Social Security standoff introduces a variable that the Federal Reserve's decisions cannot control.
Gopi Shah Goda, director of the Brookings Institution's Retirement Security Project, said lawmakers had more gradual policy options two decades ago.
Today, policymakers face greater urgency because they must address Social Security's revenue shortfalls or benefit reductions much sooner, Goda told AARP.
The senators elected in the 2026 midterms will still be in office when the trust fund runs dry, and their choices will determine what follows, the Bipartisan Policy Center warned.
Social Security's timeline matters for housing affordability
Whether mortgage rates hold in the mid-6% range or surge toward levels not seen in decades depends on how quickly Congress addresses Social Security's shortfall.
Every year of delay narrows the available fixes and raises the cost of eventual reform, the Bipartisan Policy Center noted.
Rising Treasury yields from Social Security borrowing would affect not only retirees but also families trying to buy or refinance homes.
The 2032 deadline is six years away, but bond market consequences could arrive well before the trust fund reaches zero, the researchers stressed.
Related: Americans must face long-term reality after mortgage rate news
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This story was originally published July 10, 2026 at 5:33 PM.