Rising energy prices fueled by tensions surrounding Iran have heightened inflation expectations, triggering one of the most significant monthly bond sell-offs in the eurozone in nearly a decade. Borrowing costs for Italy, France, and Spain have surged to multi-year highs, amplifying market concerns that governments will be compelled to increase fiscal spending to shield consumers. The yield on Italy's 10-year government bond climbed to 4.14% this month, its highest level since mid-2024, with a monthly increase of approximately 0.8 percentage points. The scale of the sell-off is comparable to that witnessed during the previous energy crisis in 2022. France's 10-year yield reached nearly 3.9%, its highest since 2009, while Spain's equivalent yield approached 3.7%, a level not seen since the end of 2023. The "Iran shock" has driven up oil and gas prices, stoking inflation expectations and potentially forcing the European Central Bank to implement three interest rate hikes this year. Concurrently, national budgets are deteriorating due to energy subsidy measures, exacerbating the bond market sell-off and creating a spiral of rising borrowing costs.

Inflationary Fears Return, Central Bank Adopts Cautious Stance A member of the European Central Bank's Executive Board, Isabel Schnabel, stated on Friday that "the spectre of inflation has returned," and the speed of this shift has surpassed "many" expectations. However, she also indicated that the ECB need not "rush to act" and still has "time to observe the data" while awaiting further evidence of secondary inflation effects. An economist at ING, Bert Colijn, noted that part of the current yield increase reflects investors unwinding previous positions that bet on narrowing yield spreads, particularly focused on Italy. He mentioned that significant market concern regarding eurozone sovereign debt risk is not yet observable, but warned that "if the situation continues to deteriorate and the cost of fiscal measures climbs further, this risk could still emerge." The chief European macro strategist at T Rowe Price, Tomasz Wieladek, commented, "Investors are realizing that we are entering a combination of low growth and high inflation, coupled with more fiscal stimulus and expanded government spending."

Varying National Response Measures In response to the energy price shock, eurozone countries are implementing fiscal measures of varying intensity, but all are generally facing limited room for maneuver. Spain's parliament approved a €5 billion tax cut package on Thursday, reducing the value-added tax rate on electricity, natural gas, and fuel from 21% to 10%. The package was proposed by leftist Prime Minister Pedro Sánchez. Italy has temporarily cut fuel excise taxes by 20%, a measure lasting until April 7 at an estimated cost of €417 million, after which it will be reassessed. The Italian government plans to offset the revenue loss by cutting expenditures in other areas, including healthcare. France has chosen to maintain fiscal discipline, refraining from large-scale energy subsidies. The French Prime Minister, citing a projected fiscal deficit of 5.1% of GDP by the end of 2025, stated there is "no savings pot to tap into." The government has only introduced targeted measures for heavily impacted sectors like agriculture and trucking, costing approximately €70 million in April. A senior fellow at the Bruegel think tank, Simone Tagliapietra, pointed out that measures announced so far by countries like Spain demonstrate that "we are talking about large sums of money." He cautioned, "European governments face fiscal constraints with many competing demands, especially for defense spending. Public budget space is very limited. I don't think there is fiscal space for large-scale intervention like in 2022-2023."

Intensified Budgetary Pressure, Narrower Buffer This Time The previous energy crisis serves as a cautionary reference for the current situation. According to data from the Bruegel think tank, European countries (including the UK and Norway) have allocated and earmarked a total of €651 billion since the energy crisis began in September 2021 to protect consumers from rising energy prices. The OECD noted this week that many response measures in the last crisis were "not sufficiently targeted and incurred significant fiscal costs," warning that measures taken this time to cushion energy price increases will "further exacerbate the budget pressures most governments are already facing." The global head of research at Natixis CIB, Jean-François Robin, stated that investors are betting that eurozone public finances "will deteriorate" as countries spend "large amounts of public money" to absorb the shock.

Spread Advantage Reverses, Threshold Risks Loom This bond market sell-off has reversed the yield spread advantage that highly indebted eurozone member states held relative to Germany. For instance, the spread between Italy's and Germany's 10-year government bonds was about 0.6 percentage points before the conflict erupted but has now widened to nearly 1 percentage point. Several investors emphasize that current spread levels remain moderate from a historical perspective—Italy's spread reached 3 percentage points during the pandemic. A portfolio manager at bond giant Pimco, Konstantin Veit, said, "The current spread widening does not negate the long-term logic of spread narrowing," noting that it would require several years of high interest rates combined with low growth to genuinely raise debt sustainability concerns. However, some analysts highlight key threshold risks: if Germany's 10-year bond yield (currently around 3.1%) rises further above 3.5%, borrowing costs for Italy and France could be pushed towards 5%. T Rowe Price's Wieladek warned that at that point, "debt sustainability would become uncertain."