The United States’ gross national debt reached $40.047 trillion on August 18, 2026, according to Treasury Department data, roughly double its January 2017 level and four times its amount two decades ago. The total rose by $1 trillion from $39 trillion in March 2026, with about $32.266 trillion held by public investors and the remainder recorded in intragovernmental accounts, including Social Security trust funds. The milestone coincided with the 30-year Treasury yield reaching 5.337%, its highest level since 2007, while annual net interest costs exceeded national defense spending and the fiscal 2026 deficit remained projected at about $2 trillion. IMF managing director Kristalina Georgieva urged advanced economies including the United States and United Kingdom to pursue fiscal consolidation and protect price stability, warning that higher borrowing costs were increasing pressure on government finances. UK borrowing reached £18.3 billion ($24.4 billion) in August, nearly a fifth above the previous year and above official forecasts, while monthly debt interest reached its highest August level since records began in 1997. The Treasury has used buybacks of older, long-dated bonds to support market liquidity and reduce the effective supply of long-duration debt. Georgieva also identified energy-price shocks, artificial-intelligence investment and the potential loss of safe control over AI systems as economic and financial-stability risks.