Richmond Federal Reserve President Thomas Barkin delivered a blunt warning about the trajectory of US government debt: keep piling it on, and eventually bond buyers will walk away. With the national debt now exceeding $40 trillion, the message carries more weight than the usual Beltway hand-wringing about fiscal responsibility.

Barkin described current debt levels as a persistent “wind” that the Fed must navigate. The 30-year Treasury yield has climbed to peaks not observed since before the Global Financial Crisis, driven by a toxic cocktail of fiscal concerns and lingering inflation risk.

The $40 trillion elephant in the room

The US national debt crossed the $40 trillion threshold in August 2026, arriving months ahead of previous estimates. Publicly held debt is now approaching 100% of GDP, a ratio that tends to make bond investors nervous.

The Congressional Budget Office has projected significant increases in interest costs going forward. That creates a feedback loop: more debt means higher interest payments, which means more debt to cover those payments, which means higher interest payments.