AJ Tiarsmith

Mon, August 3, 2026 at 6:16 AM EDT 4 min read

Quick Read

• U.S. debt hit $39.84 trillion and now costs over $1 trillion in annual interest, a figure that is nearly triple 2020 levels and has surpassed defense spending.

• Bessent's yen intervention is strategic self-defense: a collapsing yen forces Japan to sell U.S. Treasuries, directly driving up Washington's borrowing costs.

• Japan's government debt tops 237% of GDP, and the Fed-BOJ rate gap of 2.75 points keeps the yen structurally weak and intervention-dependent.

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The U.S. Treasury's own accounting says the country owed $39.84 trillion as of July 30, 2026, a figure climbing by roughly $12.6 billion a day and almost certain to breach $40 trillion before the fiscal year closes on September 30. That same week, a Reuters photographer captured Treasury Secretary Scott Bessent's notepad at a Camp David cabinet meeting. Under "To Do," one line read: "Buy Japanese Yen (JPY) $5-10 bil." On July 31 and August 1, the United States joined Tokyo in the first coordinated dollar-yen intervention in more than a decade.

The Home Balance Sheet

The debt has roughly doubled since Trump's first term began at $19.9 trillion in January 2017. It crossed $38 trillion in late October 2025 and $39 trillion by March 17, 2026, adding a full trillion in under five months. Penn Wharton's Kent Smetters argues the economically meaningful figure is debt held by the public, now above $31.3 trillion, since the rest is intragovernmental IOUs.

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The service cost is the punchline. The Congressional Budget Office's February 2026 outlook has net interest exceeding $1 trillion in fiscal 2026, nearly triple the $345 billion paid in 2020. In the first three months of FY2026, net interest hit $270 billion, already surpassing defense spending for the same window. CBO projects debt held by the public rising from 101% of GDP today to 120% by 2036, surpassing the post-WWII record of 106%. The long end of the curve is pricing that trajectory: the 30-year Treasury closed July at 5.27%, up 30 basis points on the month, with the 10-year at 4.75%.

Bessent's Yen Errand

Against that backdrop, the Treasury Secretary spent the final days of July orchestrating a rescue of someone else's currency. The yen had flirted with its weakest levels since 1986 before rebounding to 157.40 per dollar by Friday's close. It sits at 157.08 as of Monday morning. On Thursday, July 30, Japan alone spent an estimated ¥8.45 trillion, roughly $52.8 billion, likely its largest single-day intervention ever. The Federal Reserve Bank of New York then sold euros to buy yen on behalf of the U.S. Treasury. Bessent called the yen "very undervalued" and said the U.S. "will not hesitate to participate in further joint intervention."