France’s debt premium nears 90 basis points

France's 10-year borrowing cost hit 4.31% on 9 September, a level not seen since the 2008 financial crisis (Reuters via Les Echos Investir). That sounds like a debt emergency. It isn't one, at least not yet. Most of the rise came from a worldwide jump in bond yields (the annual return investors demand to lend to a government). What isolates France's own problem is smaller, slower-acting, and worth understanding precisely.

France rose more than Germany, but not by as much as the headline suggests

Bond yields climbed across countries that week. Even Germany, the euro area's safest borrower, reached 3.42% (Reuters via Investing.com). On 9 September itself, Germany's yield rose 6 basis points (hundredths of a percentage point) while France's rose 8.5 (Reuters via Les Echos Investir). France moved about 2.5 basis points more than Germany that day. That gap is real, but a single trading session cannot tell you how much of the difference is fiscal risk and how much is noise.

The accumulated gap tells a clearer story. The spread (the difference between what France and Germany pay to borrow over ten years) reached 88.7 basis points, close to 90, its widest since November 2024 (Idéal Investisseur). That spread has been building for months. It reflects the extra premium investors charge France for its deficits and political uncertainty.

How wide is that premium in context? At the open on 9 September, Greece was borrowing more cheaply than France (France 24/AFP), and Italy's 10-year yield stood at 4.21% against France's 4.26% (QuiFinanza). France now pays more than countries it used to lend circles around.

How higher rates reach the budget

The 4.3% yield does not instantly reprice France's entire €310 billion 2026 borrowing programme. By the end of July, the Treasury had already sold about 71% of this year's bonds at earlier, lower rates (Agence France Trésor). Existing bonds keep paying their original rates until they mature, and France's average debt life exceeds eight years (French Senate). The squeeze arrives gradually, as old cheap debt rolls over into new expensive debt.

But it has already started. At the 3 September auction, the accepted yield on France's benchmark November 2036 bond jumped from 3.90% in August to 4.23%, according to Boursorama. Buyers still showed up: the bid-to-cover ratio (total orders divided by bonds on offer) was 2.28, meaning more than twice as many euros were bid as the Treasury was selling. That is orderly demand, not a buyers' strike.

The European Commission projects France's deficit at 5.1% of GDP this year, rising to 5.7% in 2027 without new measures, with debt heading past 120% of GDP (European Commission, European Commission EDP). If rates stay elevated, the French Senate's own sensitivity analysis estimates roughly €3.2 billion in extra interest costs in the first year and €23.5 billion over five years, assuming rates remain at their higher level throughout (French Senate). That money narrows the government's future choices on taxes, spending, and investment.

The ECB can buy a country's bonds when market stress breaks the normal transmission of its interest-rate policy, using a tool called the TPI (ECB). Nothing on 9 September suggested the conditions for intervention were close. Economists polled by Reuters unanimously expected the ECB to raise its deposit rate to 2.50% the next day (Reuters via Devdiscourse). Higher policy rates keep the floor under bond yields everywhere.

New buyers of French bonds receive a higher promised nominal yield if they hold to maturity. Existing bondholders, who bought at lower yields, see the market value of their holdings fall. French taxpayers absorb the cost gradually, as each refinancing replaces cheap 2010s-era debt with bonds priced for today's reality. France's funding market remains orderly, but every refinancing at today's fiscal premium narrows the government's future budget choices.