G7 Debt Moves From Fiscal Challenge to Broader Market Pressure

Government debt across the Group of Seven is entering a more demanding phase as higher borrowing costs collide with expanding spending requirements. The pressure is particularly visible in the United States, Japan and several European economies, where rising bond yields are increasing the cost of financing public spending and influencing borrowing conditions across the wider economy.

The scale of the challenge has increased with U.S. government debt surpassing $40 trillion for the first time. At the same time, governments face structural spending pressures linked to ageing populations, climate change and defence, while the Iran war has revived inflation risks and increasingly volatile weather in Europe is adding another burden to public finances.

The significance of rising sovereign yields extends beyond government budgets. Government bonds establish important benchmarks for borrowing costs throughout financial markets, meaning that higher sovereign financing costs can feed into corporate borrowing and household mortgages. As a result, the debt problem is increasingly connected to the cost of capital facing businesses and consumers.

Rising yields are not a new development for the G7. Government borrowing costs increased after the COVID-19 pandemic and Russia’s invasion of Ukraine, as central banks raised interest rates aggressively to contain inflation. Longer-term yields are also being influenced by investors demanding greater compensation for holding government debt.

A newer source of pressure is the rapid borrowing by AI hyperscalers. The increase in corporate bond issuance is adding to the volume of debt competing for investor capital, prompting buyers to seek higher returns before absorbing additional supply. This creates another layer of competition in capital markets at a time when governments themselves are issuing large quantities of debt.

The changing shape of government borrowing is also becoming strategically important. The spread between short- and long-term government bond yields has widened, making longer-term financing relatively more expensive. Some governments have responded by issuing more short-maturity debt, but that approach carries refinancing risk because debt must be repaid or rolled over sooner. Any subsequent increase in yields can therefore translate more quickly into higher interest costs.

The underlying debt position remains substantial across the G7. Government debt is roughly equal to or greater than economic output in every G7 economy except Germany. Japan has the highest debt level, with government debt exceeding twice the size of its economic output. Germany, traditionally associated with fiscal restraint, is also increasing borrowing to finance defence investment and public spending.

The accumulation of debt has been reinforced by successive global shocks. The 2008 financial crisis, the 2011–12 euro zone debt crisis and the 2020 pandemic increased debt levels and weighed on growth. More recently, the Russia-Ukraine war, the Iran war and extreme heat have increased spending requirements, while ageing populations and rising interest bills are expected to add further pressure.

For governments, the immediate financial consequence is increasingly visible in interest payments. Higher post-pandemic borrowing costs are feeding into the cost of refinancing debt that was previously issued at lower rates. Although interest payments remain below historical peaks in many countries, their share of economic output has been rising across most G7 economies, particularly in the United States. Across OECD countries, interest payments had already exceeded defence spending in 2024.

The United States is also facing greater investor sensitivity to longer-term fiscal risk. The term premium on U.S. Treasuries, which measures the additional compensation investors demand for holding longer-dated debt, has increased since the pandemic. Concerns include U.S. fiscal policy, the Federal Reserve’s reduction of its bond holdings, longer-term inflation uncertainty and questions surrounding communication under new Federal Reserve Chairman Kevin Warsh. The term premium across major OECD economies has reached its highest level in more than a decade.

Europe presents a more differentiated picture. Investors have reduced the additional compensation they demand to hold bonds issued by some euro zone governments compared with German debt, reflecting stronger European cohesion after the pandemic. Italy has benefited from political stability and a lower budget deficit, helping push its debt risk premium to its lowest level since 2008 recently. France, by contrast, faces greater investor concern as political fragmentation has slowed efforts to reduce its budget deficit.

France’s fiscal outlook remains particularly sensitive because the country faces a key election test next year. An independent report commissioned by the government warned in July of a sharp deterioration in public finances over the rest of the decade unless policymakers move quickly to curb spending.

Japan represents another critical pressure point for global bond markets. Its benchmark 10-year government bond yield is close to 3%, a level not seen since the mid-1990s. Inflation, fiscal concerns and expectations for monetary policy are reshaping a market that was historically characterized by very low interest rates.

Japan’s position has broader international implications because it is the most indebted country in the developed world and Japanese investors have historically been important participants in overseas bond markets. Prime Minister Sanae Takaichi’s spending plans have renewed fiscal concerns, while government debt auctions are being closely monitored for signs of market stress. Japan has responded by reducing longer-dated bond issuance, helping stabilize demand, although borrowing costs remain under upward pressure.

The potential consequence extends beyond Japan. If higher domestic Japanese yields make local assets more attractive, Japanese investors could redirect capital back home. Such a shift could reduce a long-standing source of demand for U.S. and European government debt, potentially adding another layer of pressure to international bond markets.

The evolving debt environment therefore creates a strategic challenge for governments rather than simply a short-term market problem. Policymakers must balance defence, climate, demographic and other spending priorities against the increasing cost of financing those commitments. At the same time, businesses are exposed to the same higher cost of capital through sovereign borrowing benchmarks.

For financial markets, the key issue is whether governments can manage rising debt without allowing interest costs to consume a growing share of public resources. The combination of elevated debt, inflation uncertainty, changing investor preferences and increased competition for capital means that fiscal decisions are becoming increasingly important to the pricing of government and corporate debt alike.

The G7’s debt challenge is consequently becoming a defining feature of the broader financial environment. The direction of long-term yields, the ability of governments to control spending and the willingness of investors to absorb growing debt issuance will determine how much room major economies retain for future fiscal priorities.