US Treasury faces growing competition as foreign bonds offer higher yields and debt tops $40 trillion

The 30-year US Treasury yield surged to 5.34% in mid-August, a level not seen since 2007, forcing the Treasury Department into an unusual emergency response. The intervention, an announced doubling of long-dated bond buybacks, arrived against a backdrop that would make any fiscal hawk reach for the antacids: national debt crossing the $40 trillion threshold for the first time and foreign buyers quietly shopping elsewhere.

Treasury Secretary Scott Bessent’s department said it would increase buybacks of 10- to 30-year bonds from $2 billion per operation to at least $4 billion, effective September 9 and lasting two months. The 10-year yield, meanwhile, hovered near 4.7%, keeping pressure on everything from mortgage rates to corporate borrowing costs.

Foreign buyers are finding better deals

Net foreign purchases of US Treasuries fell to their lowest since January 2026, with June flows particularly anemic. The culprit isn’t just appetite. It’s arithmetic. Sovereign bonds in the UK, Japan, and other major economies saw yields climb to levels that started competing credibly with US paper, giving overseas investors a reason to keep money closer to home.

Japan, the largest foreign holder of US Treasuries alongside China, added a complication of its own. Coordinated yen interventions between Washington and Tokyo were executed in part to prevent Japan from dumping large chunks of its Treasury holdings to support its currency.

The buyback gambit and its limits

The Treasury’s buyback strategy is essentially a short-term pressure valve. By purchasing its own long-dated bonds on the open market, the government removes supply and, in theory, pushes yields back down. It worked, briefly. Yields dipped after the announcement before rebounding as investors refocused on the fundamentals: persistent inflation concerns and a debt pile that’s growing faster than GDP.

Doubling buybacks from $2 billion to $4 billion per operation sounds aggressive until you compare it to the scale of outstanding debt. With more than $40 trillion on the books, a few billion dollars in buybacks is the fiscal equivalent of bailing out a rowboat with a coffee mug.

Why the debt threshold matters

Crossing $40 trillion in national debt is partly symbolic, the way any round number is. But it arrives at a moment when the cost of servicing that debt is itself becoming a meaningful budget line item. When yields were near zero, the US could borrow almost for free. At 5% on the long end, the interest payments start competing with defense spending and entitlement programs for budgetary oxygen.

The last time the 30-year yield was in this territory, in 2007, the US debt-to-GDP ratio was roughly half of what it is today.

What investors should watch

The September 9 start date for expanded buybacks will be the first test of whether the Treasury’s intervention can durably cool yields. If long-dated rates stay elevated through the operation, it will confirm what many fixed-income strategists suspect: the problem is bigger than supply management can solve.

For equity investors, rising real yields historically act as a headwind for growth stocks and risk assets broadly. When you can earn 5.34% risk-free on a 30-year Treasury, the hurdle rate for every other investment goes up.

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