Servicing the U.S. national debt is now costing the Treasury more than $3 billion a day, with net interest on public debt totaling $963 billion from October 2025 through July 2026, according to the Congressional Budget Office (CBO, nonpartisan U.S. budget scorekeeper). The CBO said that works out to $96.3 billion a month, or about $3.18 billion a day over 303 days, and marks a $117 billion, or 14%, increase from the same period a year earlier because the debt stock is larger and long-term interest rates are higher. It said lower short-term rates partly offset the increase. The August budget update also showed deficits of $1.8 trillion in the first 10 months of the fiscal year, up $169 billion from a year earlier, prompting the CBO to lift its full-year deficit projection to $2.1 trillion, $200 billion above its February estimate. The figures add to concerns among fiscal hawks that a debt-to-GDP ratio of 122%, as cited from the St. Louis Fed, could eventually force lenders to demand higher risk premiums on U.S. borrowing. The report came after Treasury Secretary Scott Bessent said the Treasury moved last week to support the Japanese yen, a step he told CNBC was important for regional stability. That matters for U.S. borrowing costs because Japan, with $1.14 trillion in Treasury securities as of May 2026, is the largest foreign holder of U.S. debt.