[Iran War Pushes Up G7 Government Financing Costs; US Bears Largest Increase] According to the Financial Times, since the US launched its war against Iran in February, rising global bond yields have increased borrowing costs for the world's largest developed economies by tens of billions of dollars. Analysis of government bond issuance data shows that since the start of the war, rising yields have added an extra $16 billion to the sovereign debt financing costs locked in by G7 countries. If the yield increase continues, these countries are expected to pay an additional $34 billion in financing costs by the end of the first quarter of next year. Currently, yields on almost all G7 government bonds across all maturities are higher than in February. The US has borne the vast majority of the new costs, estimated at $10.6 billion, as it is the largest economy in the G7 and has the world's largest sovereign bond market. If the rising yields continue until the end of the first quarter of 2027, the US is expected to pay an additional $21.7 billion in interest costs. Major energy importers such as the UK, Italy, Germany, and Japan have also been affected. Other G7 countries have borne slightly more than a third of the total increase in costs.
