Belgium Faces 10 Billion Budget Gap as Bond Rates Surge
The Belgian federal government under Prime Minister Bart De Wever is confronting a formidable fiscal challenge: finding 10 billion euros in budget savings by 2029 while government borrowing costs climb to levels not seen in over a decade. The combination of an ambitious consolidation target and rising interest rates has created a perfect storm for the five-party “Arizona” coalition, which must reach agreement before a budget conclave scheduled for late September.
A Mounting Fiscal Crisis
Belgium’s fiscal position has deteriorated sharply in recent years. The country’s public debt grew by 48.3 billion euros in 2025, reaching 107.9% of GDP, while the budget deficit stood at 5.2% of GDP - one of the highest in the eurozone, according to the Federal Debt Agency’s annual report.
The interest burden has become particularly acute. Belgium spent 10.78 billion euros on debt interest charges in 2025, representing 1.68% of GDP - the third consecutive year of increases. Finance Minister Jan Jambon described the situation bluntly: “This means nearly 11 billion euros that we will not be able to invest in society. These billions go up in smoke every year.”
The government’s response has been to set an ambitious consolidation target. On July 10, the restricted council of ministers agreed to pursue a budget effort of 10 billion euros by 2029, exceeding the 7.7 billion euros required by the Monitoring Committee to keep the deficit under control. As RTBF reported, the government aims to achieve two years in advance the spending norm required for 2031, seeking to prevent a “snowball effect” of rising interest charges.
Rising Bond Rates Compound the Problem
The fiscal challenge is being exacerbated by a global surge in sovereign bond yields. Belgium’s 10-year bond rate exceeded 3.8% in August, reaching 3.803% on August 18 - the highest level since 2012, as RTBF reported. The OLO (linear bond) 10-year rate rose approximately 40 basis points in July and August alone.
Jean Deboutte, Director of the Federal Debt Agency, explained the drivers: “Investors now fear high inflation in the long term, as well as a firm reaction from central banks that will raise their key rates because of this inflation.” The global context is tense - the US national debt has crossed $40 trillion, with 30-year Treasury yields hitting 5.3%, the highest since 2007, as CGTN reported.
The rising rates have direct consequences for Belgian households and investors. The next Belgian state bond (bon d’Etat) will offer 3.7% gross interest for 10 years and 2.75% for one year, with the subscription period running from August 26 to September 3, as La Libre reported. While attractive for savers, these rates reflect the elevated cost of government borrowing.
De Wever’s “Everest”
Prime Minister De Wever has been characteristically candid about the scale of the challenge. Speaking on July 21, he described the 10 billion euro target as “more like Everest” and acknowledged the difficulty of the task: “5 parties, 10 billion, the addition of these two elements, it will be very complicated, I won’t deny it. If I’m incapable of doing it, we’ll see, we have to take responsibility,” he told RTL Info.
De Wever has used colorful metaphors throughout the process, referring to the budget as a “col hors catégorie” (beyond-category mountain pass) and describing the multi-layered approach as a “budget tiramisu” where no social or economic layer would be spared, as DH reported.
King Philippe has also weighed in, emphasizing the difficulty of mastering the budget in his annual address before the national holiday, as RTL Info reported.
The Hunt for 10 Billion
The government has a menu of options. The Federal Planning Bureau provided a list of 263 potential measures in June that could generate billions in savings. According to DH’s analysis, options range from tax changes - including potentially removing tax exemptions for dependent children, which could raise 2 billion euros - to spending cuts across various sectors. However, coalition partners remain remarkably discreet about their intentions, with each party reluctant to reveal its hand before negotiations begin.
The parties are already showing signs of tension. MR President Georges-Louis Bouchez dismissed election speculation, while Les Engages’ Yvan Verougstraete said preparing for the worst “is not at all on the agenda.” Vice-Prime Minister Vincent Van Peteghem (CD&V) warned: “Nobody will understand if we blow up the government.”
What’s Next
The government will hold a budget conclave in late September, with the goal of presenting the full budget plan by mid-October at the declaration of general policy. The stakes are high: failure to reach agreement could trigger a government crisis, with De Wever potentially forced to tender his resignation.
Meanwhile, the global bond market remains volatile. Federal Reserve Chairman Kevin Warsh delivered his first major Jackson Hole speech on August 28 in a tense economic context, and the direction of global interest rates will significantly influence Belgium’s borrowing costs in the months ahead.
As RTBF’s analysis noted, the end of summer 2026 promises to give more than one government cold sweats - and Belgium is no exception. The coming weeks will determine whether the Arizona coalition can deliver on its ambitious fiscal promises or whether the combination of austerity and rising rates proves too much to bear.