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U.S. debt reaches a milestone
8/21/2026
The challenge is no longer just how much debt the U.S. has, but how expensive it is becoming to finance it
The U.S. approached a historic milestone: Federal debt surpassed the USD 40 trillion mark for the first time. If current borrowing trends persist, total debt could reach USD 50 trillion as early as 2029. The timing is striking, as the United States marks its 250th anniversary. For investors, however, the more important question is not the absolute size of the debt, but how much it will cost to finance it in the years ahead. Interest expenses have already become one of the fastest-growing items in the federal budget.
The issue is also likely to draw greater political attention. Once the anniversary celebrations are over, deficits, debt levels and the long-term sustainability of U.S. public finances could move back into the spotlight. The $40 trillion threshold gives that debate a powerful headline.
At first glance, the situation appears alarming. Yields on long-term U.S. Treasury bonds have risen back to levels last seen before the Global Financial Crisis. Most recently, the U.S. Treasury had to offer yields of more than 5% on newly issued 30-year bonds. Yet markets continue to provide little evidence that investors are fundamentally questioning the creditworthiness of the United States. Demand at Treasury auctions remains robust, and even repeated sales by foreign investors, for example during Japanese yen interventions, have so far failed to disrupt the market’s balance. At the same time, the cost of insuring against a U.S. default, as measured by Credit Default Swaps (CDS), has recently fallen back to around 38 basis points. Markets are therefore signaling higher financing costs, but not a crisis of confidence.
One reason is the unique role of the U.S. Treasury market in the global financial system. For many institutional investors worldwide, there are few alternatives that can match its size, liquidity and perceived safety. The U.S. dollar’s role as the world’s leading reserve and trading currency remains an additional pillar of support.
The real challenge in the years ahead may therefore be less the level of debt itself than the cost of financing it. For more than a decade, the United States benefited from exceptionally low interest rates. Today, however, maturing debt increasingly has to be refinanced at significantly higher yields. This is particularly important as a large share of Treasury borrowing takes place through shorter-dated securities, where financing costs adjust more quickly to changes in interest-rate expectations. As a result, a growing share of government revenues is being absorbed by interest payments alone.
This sensitivity was underlined this week when the U.S. Treasury announced that it would at least double the size of buyback operations for longer-dated debt, a move aimed at supporting liquidity after long-term yields rose to multi-year highs.
“Forty trillion dollars of debt does not in itself mark a macroeconomic trigger point,” says Christian Scherrmann, U.S. Economist at DWS. “However, it clearly illustrates how far U.S. fiscal policy has moved away from its historical path. Over the long term, not only the absolute level of debt will matter, but also how much economic output must be devoted to financing it.”
The USD 40 trillion threshold is therefore above all a political milestone. For investors, the more important consideration is that financing this debt once again carries a meaningful cost after years of exceptionally low interest rates. Developments in the Treasury market suggest that the U.S. continues to benefit from investor confidence. At the same time, one message is becoming increasingly clear: the future resilience of U.S. public finances will depend not only on the size of the debt burden, but also on the cost of refinancing it.
Sources: Bloomberg Finance L.P., DWS Investment GmbH as of 8/17/26
This information is subject to change at any time, based upon economic, market and other considerations and should not be construed as a recommendation. Past performance is not indicative of future returns. Forecasts are based on assumptions, estimates, opinions and hypothetical models that may prove to be incorrect.