A Washington-based policy group is warning that the United States is approaching a fiscal threshold that Congress can no longer afford to ignore.
The National Seniors Policy Center (NSPC), in a September 2026 report addressed directly to House Speaker Mike Johnson and Minority Leader Hakeem Jeffries, argues that the trajectory of federal debt servicing costs has entered what it describes as an exponential growth phase.
According to data from the Bureau of the Fiscal Service, which publishes monthly interest expense figures, gross interest on the federal debt is on track to reach approximately $1.4 trillion in fiscal year 2026, covering the period from October 1, 2025, through September 30, 2026.
"We are increasingly borrowing new money simply to pay the cost of money we have already borrowed," said Daniel Perrin, President of the National Seniors Policy Center, in the report. "That cycle compounds on itself, and the longer Congress waits to address it, the more difficult and costly it becomes to change course."
The NSPC report uses what it calls the "interest-to-borrowing ratio" - gross annual interest expense divided by net new borrowing from the public - as its central measure of fiscal stress. The center calculates that ratio at approximately 67 cents as of September 2026, compared with roughly 40 cents in 2023 and just over 60 cents in 2024.
According to NSPC's framework, once the ratio crosses 70 cents, the federal government has entered a spiral in which most new borrowing funds nothing but the cost of prior debt.
The report's projections draw directly on Treasury's own quarterly refunding statements and Congressional Budget Office monthly budget reviews. The CBO's August 2026 update projects a full-year fiscal 2026 deficit of approximately $2.1 trillion - some $200 billion worse than projected in February 2026, according to the report. Gross federal debt crossed $40 trillion in late August 2026, a milestone the NSPC describes as significant but secondary to the interest-to-borrowing ratio as a danger signal.
The NSPC explains that approximately $7 trillion of the outstanding debt, comprising Treasury bills and floating-rate notes, reprices within weeks of any rate change, meaning each quarter-point increase in the federal funds rate translates almost immediately into roughly $18 billion in additional annual interest, all of it financed through new borrowing.
On September 16, 2026, the Federal Reserve raised its federal funds target rate a quarter point to a range of 3.75% to 4% - its first increase since July 2023 - on a unanimous vote, according to the Federal Reserve's FOMC statement.
The 10-year Treasury yield crossed 5.04% intraday on September 15, its highest level since 2007, and held above 5% after the announcement. The 30-year hit 5.35%, a 24-year high, and the Dow Jones Industrial Average fell approximately 700 points on the day, according to CNBC and Bloomberg reporting cited in the NSPC report.
The report identifies an additional dynamic advisors should monitor: competition for bond buyers between the Treasury and large technology companies. According to estimates from JPMorgan cited in the NSPC report, the five largest AI-related cloud companies, plus Nvidia, have sold approximately $320 billion in debt so far in 2026, roughly equivalent to 68% of the Treasury's new long-term borrowing for the year.
Goldman Sachs's credit desk, also cited in the report, projects roughly $340 billion more in similar issuance in 2027. During the 2023 debt-ceiling episode, the report notes, Microsoft bonds briefly yielded less than Treasury bills of the same maturity, a reversal of the normal relationship that NSPC treats as an early warning signal.
Federal Reserve economists, according to the report, found that hedge funds absorbed approximately 37% of all net issuance of medium- and long-term Treasuries from 2022 to 2024, roughly equal to all other foreign investors combined. The NSPC warns that a market increasingly reliant on leveraged buyers is structurally fragile; in March 2020, a similar basis-trade unwind required the Fed to purchase $1.5 trillion in Treasuries over three weeks to stabilize conditions.
The report's analysis of who would bear the immediate cost of a default is likely to be of particular concern to advisors serving clients in or near retirement.
Federal law requires Social Security and Medicare trust fund surpluses to be invested in special-issue Treasury securities. The NSPC calculates that the Social Security trust fund alone holds approximately $2.7 trillion in such securities.
A Treasury unable to service its obligations, the report argues, could disrupt the redemption of those securities and delay or reduce benefit payments to the approximately 70 million current beneficiaries, not in 2033 when the trust fund is projected to run short, but immediately.
Government money market funds - approximately $6 trillion in assets under SEC Rule 2a-7, which requires 99.5% in cash, Treasuries, or Treasury repo - would also face immediate operational risk. A missed bill payment would technically break the buck across the entire category, the report states, replicating the systemic pressure seen in 2008 when the Reserve Primary Fund broke the buck on a single Lehman Brothers holding.
The NSPC's Debt Default Clock, maintained jointly with the Compact for America Educational Foundation, tracks twelve fiscal tests against the federal budget and currently stands at two minutes to midnight, the closest in its history. As of the July 2026 review, the government was failing eight of twelve tests.
The report is explicit that executive branch interventions - Treasury buybacks, debt maturity management, regulatory adjustments to bank capital rules - have proven unable to sustainably lower yields. Treasury Secretary Scott Bessent tripled bond buyback operations to $6 billion per operation in September 2026, according to the report; yields rose rather than fell after each announcement. The NSPC argues that the bond market interprets such moves as confirmation of a problem rather than evidence of a solution.
"The bond market will respond only to a legislative solution," Perrin wrote to congressional leaders. "Executive action often makes the situation worse."
The full report is available at nspc.org
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