The national debt crosses $40 trillion and interest payments set a record

The US national debt has passed $40 trillion, and interest on it is now consuming a growing share of the federal budget¹. WION put the stock of debt at around $40.3 trillion⁶. Gross interest payments on the national public debt exceeded $1.3 trillion for the fiscal year, against record receipts and record outlays⁵. One tally put the interest figure at a record $1.36 trillion, with net interest rising⁴. Net interest payments on public debt topped $1 trillion for the first time⁷.

Fortune calculated that interest payments now run at about $3 billion a day and rose 8% in the fiscal year³. The deficit for the year, reported earlier this week, was the widest in five years⁵.

Why it matters to investors

The fiscal path is now tied directly to the level of bond yields rather than to spending decisions alone. Fortune reported that if bond yields remain about one percentage point above the Congressional Budget Office’s estimates, interest costs would surge to $2.8 trillion, or 5.9% of gross domestic product³. That is the mechanism investors should hold on to: a yield move is a budget event with a lag, not a market event that clears.

A Joint Economic Committee report found that even under its lower-rate scenario, interest spending would consume 43.6 percent of available tax receipts⁸. The Hill argued that when interest payments devour the federal budget, public health systems lose operational funding and transport infrastructure falls into disrepair². Rising deficits and bond yields have already increased borrowing costs across the economy⁷.

Growth is the usual answer, and the Fund’s managing director rejected it. Kristalina Georgieva warned that economic growth alone will not solve the debt problem, with US output estimated to grow 2.2% this year, up from 2% in the prior year⁹.

What to watch

The path of long-dated yields, since the difference between the Congressional Budget Office’s assumptions and the market’s is worth trillions over the projection window³. Whether net interest keeps climbing as a share of receipts towards the committee’s scenario^7,8. And whether the Treasury’s issuance mix shifts to the front end to hold down coupon costs, which would trade one problem for refinancing risk⁴.