Municipal Bond Yields Hit Highest Level Since 2011 as Treasury Rates Surge

Municipal bond yields spiked Thursday to levels not seen in 15 years, as rising Treasury rates and a flood of new debt issuance collided in the tax-exempt bond market.

The 30-year benchmark municipal bond yield rose 14 basis points to 4.89% as of 4 p.m. New York time, the highest since February 2011 and the biggest one-day jump since April 2025, according to Bloomberg. The 10-year benchmark muni yield climbed 15 basis points to 3.69%, also the highest since April 2025.

An analysis noted the selloff hit hardest in the AA General Obligation segment, which anchors much of the municipal market. For top-bracket investors, tax-equivalent yields calculated at the 40.8% tax rate now offer compelling carry for anyone with the balance-sheet room to extend duration. Munis are cheap right now if you can afford to lock money up for decades.

Supply Is Part of the Problem

Municipal bond issuance hit $408.5 billion through August, up 4.0% year-over-year, according to data from SIFMA, the Securities Industry and Financial Markets Association. Total outstanding municipal debt stood at $4.5 trillion as of the first quarter of 2026, up 4.8% from a year earlier.

Meanwhile trading volume is drying up. Average daily trading volume fell 8.0% year-over-year through August, per SIFMA. More bonds are coming to market while fewer investors are actively trading them, a classic setup for a duration squeeze. Yields have to rise to clear the calendar.

The muni selloff is riding on a broader surge in global interest rates tied to an energy price shock.

The European Central Bank raised its three key interest rates by 25 basis points Thursday, effective September 16, pushing the deposit facility rate to 2.5%. It's the ECB's second hike since June, when it delivered its first increase in three years. The ECB said in its policy statement that "the conflict in the Middle East continues to generate inflation pressures, and inflation is set to remain well above target for an extended period." Euro zone inflation hit 3.3% in August, driven by a more than 14% spike in energy costs, the highest since January 2023, according to the ECB. Brent crude topped $107 a barrel in overseas trading Thursday.

Simon Lack, a portfolio manager at Catalyst Energy Infrastructure, told The Epoch Times that Europe faces a rough winter because natural gas storage levels are low heading into the season, forcing the continent to pay up for alternative supply.

In the U.S., Breitbart reported that mortgage rates have climbed steadily since the war between the U.S. and Iran began in late February, as expectations of higher inflation from surging oil prices pushed up the long-term Treasury yields lenders use to price home loans. The 10-year Treasury yield stood at 4.92% Thursday morning, levels not seen since late 2023.

Housing Feels It Too

The rate surge is showing up directly in the housing market. Existing home sales fell 2% in August from July to a seasonally adjusted annual rate of 3.98 million units, the third straight monthly decline, according to the National Association of Realtors. That's the slowest pace in more than a year and just shy of the 4 million economists surveyed by FactSet had expected.

"It's not a surprise home sales and mortgage rates move in the opposite direction and we have seen mortgage rates rising, rising, rising from February," said Lawrence Yun, NAR's chief economist. The average 30-year mortgage rate hit 6.76% this week, its highest in more than 14 months, according to Breitbart, and Yun said it could reach 7%. Despite weaker sales, the median home price rose 1.6% year-over-year to $429,100 in August, an all-time high for the month based on records going back to 1999.

What Comes Next

Higher municipal yields mean higher borrowing costs for the schools, hospitals, roads, and water systems that rely on tax-exempt debt. That cost ultimately lands on local taxpayers through higher debt service or delayed projects. Whether the Federal Reserve follows the ECB's lead and raises rates again remains an open question none of Thursday's data resolves. The Epoch Times noted the ECB's move could set the stage for other central banks, including the Fed and the Bank of Japan, to tighten further, but no Fed decision has been announced. The next test for the municipal market comes as issuers work through what SIFMA data shows is an already swollen 2026 calendar, with roughly a third of the year still left for new supply to hit a market still absorbing this week's rate shock.