Getting Paid to Extend: The Case for Muni Duration

by VanEck, 8/31/26

Treasury’s pivot toward long-bond buybacks gives duration buyers their first clear green light in months — and the November midterms may add a second leg.

Key takeaways

Treasury’s decision to at least double 10- to 30-year buybacks is a policy signal, not a technical footnote. It argues for adding duration and positioning for a flatter curve.
History is on the side of the muni bid into year-end. Across 22 election cycles since 1982, the outcomes in which Republicans lose at least one chamber have been among the friendliest for 10-year AAA MMD.
Credit is past peak but not impaired. The combined Moody’s/S&P upgrade-to-downgrade ratio fell to 0.7-to-1 in 2Q26, and multi-notch downgrades hit their highest level since 3Q18.
Municipals are not cheap. Investment grade spreads sit in the 8th percentile of their 52-week range, so this is a rate and curve trade, not a spread trade.

Why Are Municipal Bonds Moving Again After a Quiet Summer?

Municipals spent the summer going nowhere in particular. That looks to be ending. On Wednesday August 19, the U.S. Treasury announced it will at least double its purchases of 10- to 30-year bonds — a deliberate attempt to pull down the long end while the department continues to fund itself at the front. The closest analog is the Federal Reserve’s 2011 “Operation Twist,” with one important difference: this time the twist is being engineered by the issuer rather than the central bank.

The market reaction was immediate and lopsided. Over the week ended August 19, 10- and 30-year Treasury yields fell 3bp and 5bp, respectively, while 10- and 30-year AAA MMD cheapened 7bp. That divergence cost tax-exempt investors: the ICE BofA Municipal Master Index returned -0.39% for the week, roughly 80bp behind Treasuries, corporates and taxable munis, and August month-to-date performance of 0.41% now trails those sectors by more than 30bp. Tax-exempt investment grade is still ahead year-to-date, but the cushion is thinner than it was two weeks ago.

We read the lag as an opportunity rather than a warning. Near-record short positioning in ultra-long bond futures had built through the bear-steepening episode that began in mid-June, and Treasury’s announcement is the kind of catalyst that forces that positioning to unwind. Municipals typically follow, with a delay.

What Does a Flatter Yield Curve Mean for Muni Duration?

What that means for portfolios: consider adding duration while yields are still high and position for a potentially flatter curve. The AAA curve remains steep by any recent standard, with 1s30s at 210bp and 1s10s at 88bp, both at or near their three-month wides. Investors are being paid unusually well to extend.

Valuation is the one place to be careful. Muni/Treasury ratios sit at 61.2% in 3 years, 71.2% in 10 and 87.0% in 30 — neutral against three-year history, with the 10-year point modestly cheap on a three-month basis. Investment grade spreads of 13bp sit in the 8th percentile of their 52-week range and high yield spreads of 153bp in the 15th. Municipals are not cheap. The case for owning them here is rate direction and curve shape, not spread compression.

How Do Midterm Elections Affect Municipal Bond Yields?

Roughly 470 Congressional seats are on the ballot November 3. Midterms are historically unkind to the party in power, and current polling reflects that: the RealClearPolitics generic ballot favors Democrats by 6.4 points, and seven in ten fund managers in BofA’s August Global Fund Manager Survey expect Democrats to take the House. A split outcome — Democratic House, Republican Senate — is the single most-expected result, at 47%.

That matters for tax-exempt rates. Looking at 10-year AAA MMD across the last 22 election cycles, the “unified Republican control going in, at least one chamber lost coming out” scenario has been among the most bullish in the sample: yields drift modestly higher into election day, then grind steadily lower, finishing roughly 13% below election-day levels about 35 days out. A status-quo outcome has historically done the opposite, cheapening about 9% over the same window.

We would not overtrade this. The bullish scenario rests on just two cycles — 2000 and 2018 — and in both, the real driver was arguably a growth scare and a Fed pivot rather than the election itself. The same caveat applies to 1986 and 2020. Election-year seasonality is a supporting argument for extending duration, not the reason to do it. Worth flagging as well: BofA’s economists still see the Fed hiking 75bp before year-end, a view 72% of surveyed fund managers do not share ahead of the election. That is a real two-sided risk to the duration call.

Is the Muni Credit Cycle Turning? What the Downgrade Data Shows

The rating cycle has clearly turned. Moody’s and S&P combined for 223 upgrades against 314 downgrades in 2Q26 — a 0.7-to-1 ratio, down sharply from 1.2-to-1 in 1Q26. Moody’s ran slightly more constructive than S&P at 0.8-to-1 versus 0.6-to-1, but 2Q26 was Moody’s first quarter since 2Q25 with more downgrades than upgrades. More notable, Moody’s recorded 25 multi-notch downgrades in the quarter, the most since 3Q18.

The concentration is the useful signal. Of those 25, seventeen were school districts and five were cities. Across the first half of 2026, school districts accounted for 64% of multi-notch downgrades and cities 17%, while healthcare — 43% of the total in 2022 — fell to zero. Recent single-name actions fit the pattern: Moody’s cut Baltimore one notch to Aa3 on declining fund balances and cash levels, and S&P took San Diego County Water Authority down two notches to AA on member credit erosion and rising costs.

None of this is a systemic credit story. State revenues remain healthy — among 26 states reporting July collections, the median gain was 7.4% year-over-year, with corporate collections up 34.3% and sales up 10.1% on a median basis. The distress that does exist is idiosyncratic and concentrated in small, rural providers: the third Chapter 9 filing of 2026, Nebraska’s Garden County Health Services, was a 10-bed critical access hospital, and four of the eight Chapter 9 petitions since the start of 2024 have been rural healthcare operators.

Which VanEck Muni ETFs Align With a Duration-Extension View?Pulling the rate call and the credit call together: the analysis points toward higher-grade, longer-duration exposure and away from territories, small private colleges and rural single-facility hospitals— the three places where the downgrade cycle is doing real damage. VanEck’s municipal ETF lineup offers a reasonably direct way to express each leg of that view.

Extending duration. The VanEck Long Muni ETF (MLN) is the most closely aligned with this view. It targets the long end of the AMT-free investment grade curve, which is exactly where Treasury’s buyback expansion should exert the most pull and where a flattening curve pays off most. The VanEck Intermediate Muni ETF (ITM) is the more moderate version of the same trade — meaningful duration without taking the full ride on 30-year paper.

Funding the extension. With 1s30s at 210bp, the front end is where investors are being compensated least for the risk they hold. The VanEck Short Muni ETF (SMB) offers shorter-duration exposure for investors who prefer to limit rate risk..

Credit exposure, handled carefully. The VanEck High Yield Muni ETF (HYD) and VanEck Short High Yield Muni ETF (SHYD) provide tax-exempt spread income, and HYD carries duration alongside it. But this is where we would be most deliberate. High yield spreads of 153bp sit in the 15th percentile of their 52-week range, so there is limited compensation for the credit cycle turning — and the sectors driving multi-notch downgrades, including small private colleges and rural hospitals, are precisely the ones that populate high yield municipal benchmarks. SHYD’s shorter profile reduces the rate risk but not the credit question. We would size high yield for income, not for spread compression, and treat it as a satellite rather than the core of a Fall rally position.

Amplified beta. For investors who want a levered read on the rally, the VanEck CEF Muni Income ETF (XMPT) holds closed-end municipal funds that typically trade at discounts to NAV and employ leverage. Both features amplify returns in a rally — and both cut the other way if the Fed hike our economists still expect arrives instead. It is the highest-conviction, highest-volatility way to own this view.

Where Are Municipal Bonds Headed in Fall 2026?

The summer range has broken, and it broke in the direction that favors duration. Treasury’s buyback expansion is a policy tailwind, and the election calendar historically adds a second leg into year-end. Spreads offer little, so this is a rates and curve trade — the case favors higher-grade, longer-maturity exposure and selectivity in the sectors where ratings are deteriorating.

By Michael Cohick

Originally published August 26, 2026

Originally posted on ETF Trends

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