$40 Trillion and Climbing: America’s Debt Just Crossed a New Threshold

The US national debt hit $40.1 trillion on September 28. That number gets thrown around so often it starts to feel abstract, so here is a way to make it concrete: it grew by roughly $1.68 trillion over the past year alone, a 4.36% increase. That is about $5,300 in new debt for every man, woman, and child in the country, added in a single year.

The day-to-day moves in this series are noise. The annual trend is the signal. A $1.68 trillion addition is close to the size of the entire Canadian economy added to the US balance sheet in 12 months. And this happened during a period when the economy was growing and unemployment was relatively low, meaning the debt is expanding even during what should be the favorable part of the fiscal cycle.

That context matters a lot right now. Interest rates are sitting near their highest levels in decades. When a government carries $40 trillion in debt and has to refinance chunks of it at today’s rates, the interest bill compounds quickly. In past cycles, high debt loads at elevated interest rates have put sustained pressure on government borrowing costs, which in turn competes with private borrowing for capital. Historically, when sovereign debt service costs crowd into territory previously occupied by productive investment, businesses and households have felt it in the form of tighter credit and higher financing costs. Credit conditions have been moving higher recently, a trend worth watching in that light.

Long-term interest rates are running near the upper end of their historical range, and consumer sentiment is near historic lows. The gap between what the debt costs to carry and what the economy earns in growth is the number that determines whether this path is sustainable or not.

Bottom Line: A $40 trillion debt load is manageable if the economy grows faster than the interest bill. The question is whether today’s rate environment and fiscal trajectory keep that math working in America’s favor.

Source: US Treasury Fiscal Data

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