France’s 4% debt squeeze hits the budget

France's 10-year government bond yield — the return investors demand to hold French debt at today's market price — reached 4.05% last week, its highest since 2009 (Boursorama/Reuters, LSE). When yields rise, the government pays more to borrow. That cost does not hit all at once. It builds, year by year, as old cheap debt matures and gets replaced by expensive new debt. The damage is to the budget, not to market access.

France is not alone. Long-term borrowing costs have also climbed in Germany, Japan, the US and the UK (The Guardian). But the France-specific worry shows up in the spread — the gap between what France and Germany pay to borrow. Last week that gap sat at 84–86 basis points, meaning 0.84–0.86 percentage points (Boursorama/Reuters, QuiFinanza). Italy's spread was around 78–82bp (El Economista). France now pays more than the country that defined the eurozone debt crisis a decade ago.

How 4% Slowly Eats the Budget

France carries €3,536 billion in public debt (INSEE). None of that reprices overnight. Existing bonds keep paying their original, lower interest rates until they mature. The squeeze works through refinancing: as old bonds expire, France's debt agency, the AFT, replaces them at today's higher rates. This year the AFT plans to issue about €310 billion in medium- and long-term bonds, up from under €210 billion in 2019 (Le Figaro, AFT).

The result already shows up in the accounts. France's interest bill hit €34.5 billion in the first half of 2026, up 19% from the same period last year (Reuters Breakingviews). Government estimates put the full-year cost at €64.8 billion in 2026 and €74.2 billion in 2027, compared with €31.6 billion in 2019 (Le Figaro). Interest now competes directly with public services and deficit reduction for every marginal euro.

Who Pays, Who Collects

New buyers of French bonds collect more income than when France was borrowing at 1% or 2%. Insurers, pension funds and yield-seeking savers all benefit from the higher coupon. Existing bondholders face the flip side: when yields rise, the market price of their older, lower-coupon bonds falls (Notizie.it). Those losses are on paper unless they sell, but banks and funds that mark portfolios to market feel the hit in their balance sheets (Il Messaggero).

The clearest losers are future taxpayers and users of French public services. The IMF says France needs structural budget tightening of about 0.8% of GDP per year through 2029 to stabilise its debt (IMF). Prime Minister Sébastien Lecornu is targeting a 2027 deficit of around 4.9% of GDP, while the EU path demands closer to 4.3% (Le Monde). Closing that gap means spending freezes, tax rises, or both.

Governments in Rome and Athens, meanwhile, gain a political talking point. Italian fact-checkers note that the comparison flatters Italy partly because German yields have risen sharply too, not only because Italy improved (Pagella Politica).

France Can Still Borrow. The Budget Is the Problem.

On 20 August the AFT sold €12.5 billion in bonds with demand comfortably exceeding supply (Les Echos Investir). Investors are willing to lend. They just charge more. The ECB has a bond-buying tool designed to stop unjustified market pressure, the Transmission Protection Instrument, but using it requires the borrowing country to follow EU fiscal rules. France has been in the EU's excessive-deficit procedure since July 2024, which makes activation harder to justify (ECB, European Commission).

France can still sell bonds. The harder test is political: Paris must legislate several consecutive years of budget tightening before the 2027 presidential election makes fiscal discipline even less popular.