US National Debt Hits $40 Trillion as Treasury Yields Reach 19-Year Highs

The United States national debt officially crossed the $40 trillion mark on August 18, 2026. Data from the Treasury Department shows the total reached $40.047 trillion, marking a rapid increase of $1 trillion in just five months since the debt stood at $39 trillion in March 2026.

This fiscal milestone has coincided with significant pressure in bond markets. On the same day the debt threshold was breached, the 30-year Treasury yield hit 5.337%, a level not seen since 2007. Annual net interest payments on this debt have now surpassed $1 trillion, exceeding the total amount spent on national defense.

Of the total debt, approximately $32.266 trillion is held by public investors, while the remainder consists of intragovernmental holdings. With deficit spending projected at roughly $2 trillion for fiscal 2026, the government continues to add to its obligations even as borrowing costs rise.

In response to the yield pressure, the Treasury Department has initiated buyback operations for long-dated bonds. This strategy aims to inject liquidity into the market and reduce the supply of long-duration paper, which has been weighing on prices.

Fiscal watchdogs, including the Committee for a Responsible Federal Budget, have warned that the current trajectory could lead to a crowding-out effect on public funding and leave the economy more vulnerable to shocks. Unlike Japan, which maintains a high debt-to-GDP ratio largely through domestic holdings, the US relies heavily on foreign governments and institutional investors to hold its Treasuries.

The combination of record debt levels, elevated yields, and rising interest costs remains a focal point for market participants as the Treasury continues its efforts to manage market function.