IMF warns global debt nears World War Two levels as Iran war drives borrowing costs to 20-year highs
The International Monetary Fund has issued a stark warning on global debt trajectories, while the United States’ role in setting interest rates amplifies pressure on households and developing economies.

Borrowing costs across major economies have surged to their highest levels in nearly two decades, driven by a widespread retreat of investors from government debt. Market participants are demanding significantly higher returns on sovereign bonds, citing concerns that the ongoing conflict in Iran will sustain elevated oil prices and keep inflation persistent. This shift in sentiment has placed substantial pressure on government bond markets, forcing states to compete for capital in an increasingly risk-averse environment.
The International Monetary Fund has cautioned that these market dynamics could push global debt levels to approach those seen during World War Two. The warning underscores the fragility of current fiscal positions, as governments struggle to service increasing debt loads amidst rising interest rates. The institution’s assessment highlights the long-term structural risks posed by the confluence of geopolitical instability and monetary tightening.
At the centre of this financial trend is the United States, which largely dictates global borrowing costs. As the US sets the tone for interest rates, its monetary policy directly influences the cost of credit worldwide. This has translated into higher mortgage repayments and car loan costs for consumers, alongside increased borrowing expenses for businesses. These rising costs are increasingly being passed on to consumers, contributing to broader economic strain.
The impact extends well beyond developed markets, with developing nations borrowing in US dollars facing acute fiscal pressure. As the value of the dollar strengthens and interest rates rise, the cost of servicing external debt increases, placing additional strain on already stretched national budgets. This dynamic threatens to limit fiscal space for essential public services and infrastructure investment in vulnerable economies.
The financial turbulence occurs against a backdrop of heightened geopolitical tension, including strained relations between the US and the UK over the Iran war. Despite a recent shooting incident at a White House dinner attended by President Donald Trump, King Charles’ state visit to the US is proceeding as planned. However, the underlying diplomatic friction and security concerns reflect the broader instability that is currently influencing global markets and investor confidence.


