US National Debt

This chart plots the total public debt of the United States, as the Treasury reports it in its Debt to the Penny release every business day, over the last five years. The values arrive in dollars and are quoted here in trillions to stay readable. The page refreshes hourly from the live data and shows the current total with the trailing 90-day change — nothing cached or estimated.

The debt rises whenever the government spends more than it collects, and it has risen in nearly every period on the chart because deficits have been the norm in war and peace, expansion and recession alike. The direction of this line, in other words, is rarely the news. What matters for markets is the pace of growth against the economy carrying it, and above all the cost of servicing it.

That carrying cost is the channel into US markets. Every dollar added here is a bond someone must buy, and a growing supply of Treasuries presses on yields at the margin — the anchor rate every mortgage, corporate loan and stock valuation is priced off. The interest bill itself now rivals the largest lines of the federal budget, which is why this site tracks the interest cost and the debt-spiral scenario on their own pages.

The caveats: the raw total includes debt the government owes itself in intragovernmental accounts, so it overstates what is owed to the market. The level alone says little without the size of the economy or the interest rate beside it — a larger economy carries the same debt more easily. And the series updates on business days only, so weekends and holidays leave the line flat.