The sharp rise in government bond yields is increasing debt-servicing costs across the Group of Seven, adding pressure to public finances already strained by historically high levels of borrowing.
The United States is at the centre of the shift. US national debt crossed $40 trillion in 2026, while annual interest payments surpassed $1 trillion for the first time. The yield on 30-year US Treasury bonds reached 5.33% on August 18, 2026, its highest level since 2007.
The increase in long-term borrowing costs means that governments face higher expenses when refinancing existing debt and issuing new bonds. For countries carrying large debt burdens, even relatively modest increases in yields can translate into substantial additional costs over time.
The United Kingdom is facing a similarly difficult position. Gilt yields approached 6%, a level not seen since 1998, while net debt interest for 2026/27 is estimated at £109 billion. The combination of elevated borrowing costs and high debt servicing is placing further pressure on government finances.
France is also confronting significant debt-servicing obligations, with projected costs of around €59 billion in 2026. Italy faces an especially closely watched trajectory, with interest payments potentially consuming roughly 9% of government revenue by 2028.
Italy’s position carries wider significance because it is the eurozone’s third-largest economy. Its debt dynamics have periodically tested the resilience of the single currency project, making any sustained increase in the share of government revenue devoted to interest payments an important measure of financial pressure.
Japan is experiencing similar pressures in its bond market, with long-term yields approaching 30-year highs. The movement reflects how higher borrowing costs have spread across developed economies rather than remaining confined to one major market.
Across the G7, the rising cost of servicing government debt has become increasingly significant relative to other public spending priorities. Interest payments have exceeded defence spending in most G7 nations since 2024, highlighting the growing fiscal burden created by accumulated debt and higher yields.
The broader debt picture is equally striking. Developed-market general government debt is projected to increase by $4.2 trillion to reach $75.8 trillion by the end of 2026, equivalent to roughly 104% of gross domestic product. Most G7 countries are at or above the 100% debt-to-GDP threshold, with Germany remaining the notable exception because of its stricter constitutional limits on deficit spending.
Higher yields are also changing the choices available to investors. After more than a decade in which exceptionally low interest rates reduced the relative appeal of government bonds, higher sovereign yields are creating a more competitive alternative to equities.
The 5.33% yield on a 30-year US Treasury bond is particularly significant for risk-averse institutions such as pension funds, insurers and endowments. The prospect of securing comparatively high returns from long-term government debt could influence how such investors allocate capital between sovereign bonds and riskier assets.
For governments, however, the same yields represent a growing financial obligation. As existing debt matures and is refinanced at higher rates, the cost of servicing public borrowing can increase even without governments taking on substantially more debt.
Italy’s projected rise to interest payments equivalent to roughly 9% of government revenue by 2028 is therefore particularly important to watch. With debt already elevated across much of the developed world, sustained higher yields could increasingly turn borrowing costs into a central constraint on government finances.
