EUR/USD hit its lowest level in 17 months last week. Many traders point to the strong U.S. dollar, and they’re partly right.
But the euro has another problem that’s separate from the Federal Reserve.
A bond market gauge that rarely makes standard forex headlines recently reached its widest level since the 2012 Eurozone debt crisis.
If you haven’t heard of the OAT-Bund spread, this is a good week to learn about it.
What Is the OAT-Bund Spread, and Why Should Traders Care?
France borrows money by selling bonds to investors, who earn interest in return. The interest rate France pays on its 10-year government bonds is called the OAT yield.
OAT stands for Obligations Assimilables du Trésor, French for standardized treasury debt.
Germany borrows through bonds called Bunds. They’re the benchmark for European government debt. Germany has the strongest balance sheet in the Eurozone, so investors treat Bunds as the region’s safest option.
So, the OAT-Bund spread isn’t a European snack you can bring home. The OAT-Bund spread is the difference between the interest rates France and Germany pay to borrow for 10 years.
Think of two neighbors applying for mortgages. Both get approved, but the one with shakier finances pays a higher rate. The spread shows how much extra France pays.
When markets are calm, the spread usually sits around 20 to 50 basis points. In February this year, the spread was about 55 basis points. By October 5, it had widened to about 147 basis points, its highest level since the 2011 to 2012 Eurozone debt crisis. France’s sovereign spread was then wider than Italy’s. It was even wider than Greece’s!
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What’s Behind France’s Fiscal Stress?
France is carrying a lot of debt. Government debt is about 119% of GDP, compared with the European Union’s reference limit of 60%. The 2026 budget deficit is running near 5.4% of GDP, well above the EU’s 3% cap. These problems have been building for years. What’s changed is that France’s political system has struggled to agree on how to address them.
Since President Emmanuel Macron called snap legislative elections in June 2024, no party has held a stable majority in France’s National Assembly. Former Prime Minister François Bayrou lost a confidence vote in September 2025 and was replaced by Sébastien Lecornu. Lecornu resigned 27 days into his first stint, then returned as prime minister on October 10, 2025.
That makes four prime ministers since the 2024 snap election, with Lecornu now serving a second stint.
Earlier this month, Lecornu’s government presented France’s 2027 budget. It aims to reduce the deficit from a projected 5.4% of GDP in 2026 to 5% in 2027, a modest improvement that investors are watching closely.
The National Assembly is scheduled to vote on the first part of the 2027 budget on October 20. The October 27 vote is on the separate 2027 social security budget. Moody’s is scheduled to review France’s sovereign rating on October 23.
Why Does This Put Pressure on the Euro?
Concern about France’s finances and political stability leads investors to demand higher yields on French bonds.
France’s borrowing costs rise while Germany’s stay relatively steady, widening the OAT-Bund spread. As that spread widens, investors looking to reduce their exposure to European assets may sell euros. EUR/USD then comes under pressure, closely followed by other euro pairs.
Here’s why a problem in France can affect the shared currency. 21 countries use the euro and share one central bank, but each country sets its own budget. When one country’s finances come under pressure, investors can’t sell a separate French currency to reduce their exposure to France. They may sell euros instead.
There’s one important wrinkle. Some analysts believe that the euro’s weakness is driven mainly by traders raising their expectations for Federal Reserve interest rates. France seems to be adding another risk premium on top.
With both forces weighing on the euro, it’s harder to tell how much the pair might recover even if the situation in Paris stabilizes.
The Bottom Line
The OAT-Bund spread is a useful gauge for tracking the euro’s independent weakness. A narrowing spread can signal that investors have more confidence in France’s finances and may support the euro. A widening spread points to more pressure, regardless of what the dollar does.
France’s political calendar brings fresh event risk this week. A budget meeting today, a possible confidence vote Thursday, and a Moody’s review of France’s sovereign rating later in October could all move EUR/USD on headlines alone, even before the U.S. trading session opens.
Two forces are weighing on EUR/USD. Elevated U.S. yields are supporting the dollar, while France’s risk premium is weighing on the euro. Both pressures would need to ease for the pair to make a meaningful recovery.
Watch for
France’s 2027 budget debate begins in the National Assembly on Tuesday, October 13. Lawmakers are scheduled to vote on the first part of the finance bill on October 20. The October 27 vote is on the separate social security budget. Moody’s review of France’s sovereign rating is scheduled for October 23.
Watch the OAT/Bund spread alongside EUR/USD. The spread was already around 130 to 140 basis points on October 9, so a move above 120 wouldn’t be a new warning. A sustained move back below 120 could signal easing pressure, while a rise toward 150 could renew it. A move toward 70 to 80 could signal a more meaningful improvement in sentiment.
This article introduces the OAT-Bund spread as a driver of EUR/USD weakness, a concept that may be unfamiliar if you mostly follow price action or Fed headlines. Premium members can read our lesson:
📖 How Bond Yield Spreads Affect Currency Movements
Reading this helps you understand how yield differentials between two countries drive exchange rates, why a widening spread like the OAT-Bund puts pressure on the euro even without a central bank policy change, and how to use spread monitoring as a practical signal in your EUR/USD trading.
And if you’re not a Premium subscriber yet, now’s a good time to sign up.
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