Spain allocates 2.4 billion euros in Treasury bills as yields reach two-year highs

Short-term Treasury bill auction results

On 8 September 2026, the Spanish Treasury allocated 2,416.82 million euros in short-term bills across three-month and nine-month maturities. Investor demand reached 6,867 million euros, producing a coverage ratio of 2.8 times the allocated volume. The Treasury placed 940.93 million euros in three-month bills at a marginal interest rate of 2.464%, up from 2.399% in the previous issue and reaching its highest level since January 2025. In the nine-month tranche, the Treasury placed 1,475.89 million euros at a marginal rate of 2.783%, compared to 2.615% in the prior sale, marking the highest yield for that tenor since October 2024. These sales follow an auction six days earlier, where the Treasury sold 6,495.7 million euros in six-month and twelve-month bills at yields of 2.641% and 2.846% respectively.

Syndicated green bond issuance

On the same day, Spain issued 4,000 million euros in syndicated 20-year green bonds maturing in July 2047. The syndicated transaction was led by Barclays, BBVA, Crédit Agricole CIB, J.P. Morgan, Morgan Stanley, and Santander. Total investor demand reached 82,000 million euros after opening with an initial order book exceeding 55,000 million euros. The green bond priced at a spread of 7 basis points above the earlier reference maturing in 2043, tightening 3 basis points from initial guidance. The issuance aims to fund ecological transition projects and allocate debt to international institutional investors.

The Ministry of Economy commented on the order book outcome.

This reiterates market confidence in the Spanish economy.

Macroeconomic pressures and rising borrowing costs

The yield increases occur ahead of the European Central Bank interest rate meeting on 10 September 2026, where markets price in a 0.25 percentage point rate increase up to 2.5%. Rising sovereign yields coincide with elevated energy prices, with Brent crude trading near 98 dollars per barrel, a 40% increase compared to levels prior to conflict in the Middle East. Annual inflation stood at 3.3% in the eurozone in August 2026 and 3.4% in the United States in July 2026. On the secondary market, the Spanish 10-year benchmark bond traded at 3.832%, its highest rate since November 2023. The average financing cost across Spain's total debt reached 2.43%, the highest level since 2017, while the average yield on new issuances rose to 2.88%.

Issuance targets and national debt volume

Spain maintains an overall public debt volume of 1.76 trillion euros, representing 101.5% of gross domestic product, down from the peak of 124.1% recorded in March 2021. For 2026, the Treasury scheduled net financing needs of 55,000 million euros, identical to the 2025 target, comprising 50,000 million euros in medium- and long-term debt and 5,000 million euros in short-term bills. Gross debt issuance for 2026 is projected at 285,693 million euros, a 4.2% increase from 274,242 million euros in 2025 due to scheduled bond redemptions. Gross issuance includes 176,935 million euros in medium- and long-term instruments and 108,758 million euros in short-term bills. The Treasury will return to debt markets on 17 September 2026 with an auction of medium- and long-term state bonds.