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.
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.”
Debt on Both Sides of the Trade
Japan’s fiscal position, measured relatively, is worse than America’s. Tokyo projects total central-plus-local government debt at 187.6% of GDP for fiscal 2026, with broader general-government gross measures landing between 228% and 237%. The Bank of Japan voted 8-1 to hold its policy rate at 1%, the highest since 1995 but still well below the Fed’s 3.75% upper bound. That rate gap is the yen’s core problem. The Fed has held at 3.75% since December 10, 2025, and core PCE keeps grinding higher, giving Chair Powell little cover to close the differential.
The self-interested read is straightforward. Japan is among the largest foreign holders of U.S. Treasuries. Left to defend the yen alone, Tokyo would eventually sell Treasuries to fund the fight, pushing U.S. borrowing costs higher precisely when Washington can least afford it. Volatility in the Japanese government bond market has already been spilling into Treasuries this year. Bessent’s yen purchase is, functionally, a Treasury market purchase by other means. The signal to watch is next month’s G20 in Asheville, North Carolina, where Bessent meets BOJ Governor Kazuo Ueda. If the FIMA Repo Facility gets “upsized” as Bessent has suggested, the world’s two most stretched sovereign balance sheets will be even more explicitly tied together.
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