The U.S. national debt crossed $40 trillion, Treasury data confirmed, and the federal government is now projected to spend more than $1 trillion in interest payments on that debt in fiscal year 2026 alone. For years, debt hawks warned that the fiscal trajectory was unsustainable. The Conference Board has now translated that warning into something every American can read on a pay stub or a mortgage statement.
What the model shows
The Conference Board built three core scenarios — a baseline drawn from Congressional Budget Office projections, a good-case in which federal deficits are cut roughly in half, and a bad-case in which deficits expand to 9% of GDP from the current 6% to 7% range. Two crisis scenarios — a sovereign default and an extreme interest-rate shock — were also modeled.
Even the baseline is costly. A family buying a $600,000 home in 2031 with a 20% down payment and a 30-year fixed mortgage faces total payments of $2.89 million over three decades. Under the good-case scenario — where Washington actually reduces its borrowing — that same buyer saves $53,000. A buyer in 2036 saves more than $100,000 under the same good-case assumptions.
The crisis scenarios are starker. If the U.S. defaults, total payments on that 2031 home exceed $3 million. Under an extreme interest-rate shock, they climb past $3.6 million.
Retirement math turns ugly
The Conference Board also modeled the Social Security trust fund, which the Committee for a Responsible Federal Budget estimates will run dry in under eight years. Medicare faces the same cliff in under seven. When the Social Security trust is exhausted, the monthly benefit reduction would reach $705 in 2033, rising to $721 in 2034 and $754 by 2036.
The CBO estimates the Treasury would need to backfill those programs by $2.7 trillion from its general fund if it chooses to maintain current payout levels — a further drag on an already strained budget.
Michael Peterson of the Peterson Institute framed the mechanism plainly in a conversation with Fortune: 'When the U.S. borrows this much … that drives up interest rates, which then increases household expenses because your mortgage goes up, your car loan, your credit card bills, and inflation more generally.'
The editorial read
The Conference Board's conclusion is unambiguous: 'Neglecting the problem will not make it better and worsening our deficits will only increase the negative impacts of the debt on the rest of the economy.' That is not a partisan statement — it is arithmetic.
What the report makes clear is that runaway federal spending is not a macroeconomic abstraction. It is a tax on the homebuyer, a cut to the retiree, and a drag on every household carrying a variable-rate debt. The good-case scenario — the one where Washington exercises even modest fiscal discipline — saves families tens of thousands of dollars. The market has already voted on what happens when governments ignore that discipline. The question now is whether lawmakers will act before the midterms force their hand.
