Net interest costs on US government debt reached $1.05 trillion for the fiscal year through September, up more than 8% from $970 billion a year earlier.
Why it matters: Rising debt service crowds out other spending and can feed higher borrowing costs worldwide.
Federal Reserve chair Kevin Warsh gave no signal on another interest rate hike in his last public remarks before the central bank's October meeting, while praising a 'synchronous tightening' by central banks worldwide. Upcoming inflation data may decide the move.