US national debt has passed a record (£29.4 trillion). This milestone is a major warning sign. It reveals vulnerabilities that threaten the long-term economic stability of the US and the rest of the world.
The speed of US debt accumulation is staggering. US national debt first in 1941 and, after rising to $20 trillion in 2017, has over the past nine years. It is expected to in the 2026 fiscal year alone.
The primary source of high US national debt is Washington’s inability to control its persistent budget deficit. This stems in part from systemic political incentives. Addressing a deficit requires either cutting public spending, raising taxes or both. These are actions that tend to be .
Various structural factors also drive high US national debt. Mandatory spending on programmes such as social security and health insurance schemes like Medicare and Medicaid consume of the federal budget. This spending is set to increase due to demographic ageing – the median age of Americans in 2001 to 39.4 in 2025.
The cost of servicing national debt has itself also become a major driver of US federal budget deficits. Annual net interest payments the US government pays on its outstanding loans currently stand at around , eclipsing national defence spending. Servicing debt is now the second-largest item in the US federal budget, behind only social security, and is more than $16.2 trillion over the next decade.
A key reason why this status quo persists is the global importance of the US dollar. The US dollar has long served as the world’s , and is the most widely used currency for international trade.
This creates high global demand for US Treasury bonds, the financial instruments the US government issues to investors to pay for its national spending.
That demand allows the US government to pay lower interest rates on these bonds, generally keeping its borrowing costs low. For years, this has provided Washington with little immediate pressure to change its trajectory.
Economic risks
However, the current trajectory poses several risks to the US and global economy. First, US Treasury bonds are considered safe assets by global investors, so often from other areas of the economy – a process economists call “crowding out”.
This is particularly true if the – the the US government pays – on them is relatively high. On August 21, the yield on the US government’s 30-year bond was , its highest level in two decades. The US Treasury is its own bonds in an attempt to stabilise the yield.
At the same time, the cost of servicing high levels of debt diminishes the US government’s to spend on areas of the economy where funding is most needed, including infrastructure, innovation and defence. Rising , which currently represent around 14-15% of total federal outlays, the federal budget.
Second, a large fiscal deficit . This hampers price stability in the US economy and can lead the country’s central bank, the Federal Reserve, to . When passed on to firms and households, higher interest rates harm economic activity.
Third, projections suggest the of US$41.1 trillion established by US Congress in 2025 is likely to be . This sets up a high-stakes legislative battle. A prolonged political showdown over whether to raise this ceiling could lead to the US government being its financial obligations.
Fourth, a is contributing to a slow-moving from the US dollar. The share of US dollars in global foreign exchange reserves currently stands , a decline compared to 2001 when it .
Central banks worldwide are diversifying into , including the Chinese yuan, South Korean won, Norwegian krone and the Canadian, Australian and Singapore dollar. They are also , with central banks of 1,000 tonnes a year over the past four years – double the average of the previous decade.
And fifth, due to the size and global significance of the US economy, there could be adverse and to other economies if US national debt continues to increase.
This is because other countries will respond to the higher yield on US treasuries, caused in part by a larger supply of these bonds as US national debt rises, by offering higher returns themselves to prevent capital from leaving their economies and their currency from dropping.
Ultimately, the US needs structural fiscal adjustment. Its tax rates need to increase from their current level of around 27% of GDP to at least the . Donald Trump’s One Big Beautiful Bill Act, which is expected to over the next decade and add new tax cuts, also needs to be reconsidered.
And finally, the US needs a bipartisan consensus on fiscal prudence to put its public finances in order. As the first US secretary of the treasury, Alexander Hamilton, said in his first in 1790: “In countries in which the national debt is properly funded and an object of established confidence, it answers most of the purposes of money”.
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