A proposal by French far-left presidential candidate Jean-Luc Mélenchon to cancel part of France’s national debt has sparked significant controversy amid the country’s early presidential campaign. Mélenchon, leader of La France Insoumise (LFI), suggests that bonds acquired by the Banque de France through years of European Central Bank (ECB) quantitative easing could be effectively erased, a move he describes as “throwing them into the fire.” He maintains this would not constitute a default, a position contested by central bankers and economists.

France’s national debt currently approaches 120 percent of GDP, with a budget deficit exceeding 5 percent this year, among the highest in the European Union. French government borrowing costs have risen sharply, with 10-year bond yields surpassing 4.6 percent—the highest level since 2008—as global market volatility, partly linked to the Iran conflict, compounds domestic fiscal concerns. The yield spread between French and German 10-year bonds has exceeded one percentage point for the first time since the Eurozone financial crisis, raising alarm among investors.

Mélenchon has elevated the debt cancellation concept as a central part of his campaign, arguing that scrapping approximately €488 billion of bonds—around 14 percent of France’s total debt—would relieve pressure on government finances, allowing greater spending on priorities such as climate change. His party has recently clarified that the plan involves converting this debt into perpetual zero-coupon bonds, rather than an outright write-off, and that any action would require a coordinated European approach. Éric Coquerel, an LFI parliamentarian, emphasized the need for a “Europe-wide solution” given the widespread debt challenges across the bloc.

However, the proposal has drawn sharp criticism from policymakers and economic experts. European Central Bank President Christine Lagarde called the idea illegal and technically unsound, stating it risks violating the EU's founding treaties by effectively amounting to direct central bank financing of governments, which the bloc prohibits. Sébastien Lecornu, French Prime Minister, described the plan as theft, underscoring the legal and financial ramifications of defaulting on debt obligations.

Economic analysts warn that such a move could trigger severe market turbulence, pushing borrowing costs even higher and causing losses for private holders of French bonds. Olivier Blanchard, former IMF chief economist, argued that achieving ECB consent for any debt restructuring of this nature is “manifestly impossible,” and attempting to proceed without it could spark a eurozone crisis. He also noted that cancelling the debt on the Treasury’s books would create an equivalent shortfall on the Banque de France’s balance sheet, shifting rather than eliminating liabilities.

Market participants and commentators express concern that the debate highlights rising political tensions amid France’s economic challenges. Natixis analysts cautioned that attempts to persuade European partners on debt cancellation could provoke volatility and strain relations with fiscally conservative countries in the Eurozone. Kevin Thozet, investment committee member at Carmignac, suggested such proposals may unsettle global investors. Meanwhile, Allianz chief economist Ludovic Subran compared the political dynamics in France to those in the United States, where populist spending promises are increasingly common ahead of elections.

The government has sought to reassure markets by proposing a 2027 budget plan targeting €54 billion in savings, although all presidential contenders have criticized the austerity measures. Polls indicate that about three-quarters of French voters are concerned about the national debt, highlighting the balancing act candidates face between fiscal discipline and public demand for increased spending. With Mélenchon polling strongly and potentially advancing to a runoff against far-right candidate Marine Le Pen—who also advocates expansive fiscal policies—the issue of debt sustainability remains a focal point of France’s upcoming electoral contest.