What Actually Makes a Muni "High Yield"?
08 April 2026
Read Time 4 MIN
Key Takeaways:
- High yield munis are project-backed, not government-guaranteed. Healthcare, education, and housing drive this market.
- Tax exemption can make after-tax yields highly competitive. High yield munis may exceed corporate high yield on an after-tax basis.
- Unrated does not automatically mean low quality. Many unrated munis skip ratings for cost reasons, not credit weakness.
What Is a High Yield Municipal Bond?
A high yield municipal bond is a tax-exempt debt security issued by a state, county, municipality, or special-purpose entity that carries a credit rating below investment grade, or no credit rating at all. These bonds fund public projects and infrastructure but compensate investors with higher interest payments for taking on additional credit risk.
The muni high yield market is considerably smaller than its corporate counterpart, with thousands of small, project-specific issuances spread across a fragmented landscape. That complexity also creates opportunities for investors who can navigate it.
What Credit Rating Makes a Municipal Bond “High Yield”?
The standard dividing line is BBB-; anything rated below that, or BB+ and lower, is considered high yield, or “speculative”. In the municipal market, however, definitions can blur. Limited supply of lower-rated bonds has led some participants to include a modest allocation to BBB-rated securities in high yield benchmarks. We take a stricter view and define high yield munis as those rated BB+ and below, along with unrated securities.
A large share of high yield munis carry no rating at all. Some issuers forgo ratings because the cost does not justify the issue size, while others simply would not qualify for investment grade. As a result, unrated bonds can represent a significant portion of the market, making independent credit analysis essential.
It’s worth noting that “unrated” does not automatically mean “low quality”. In many cases, a well-known issuer with an established track record will skip the rating process because market participants already understand the credit. The issuer’s bonds trade on reputation and fundamentals rather than a letter grade. In some instances, if these issuers were to pay for a rating, their bonds could very well land in investment grade territory. For investors, the takeaway is that the unrated portion of the high yield muni market can contain a wider range of credit quality than the label might suggest.
What Sectors Make Up the High Yield Muni Market?
Unlike the investment grade muni universe, which is heavily weighted toward general obligation bonds, the high yield market is concentrated in project-driven, revenue-backed sectors:
| Sector | What It Funds |
| Healthcare / Senior Living | Hospitals, nursing facilities, continuing care communities |
| Education | Charter schools, private universities, student housing |
| Housing | Affordable and multifamily housing developments |
| Industrial Development | Manufacturing facilities, economic development projects |
| Land / Special District | New community developments, special assessment districts |
| Tobacco | Settlement revenue bonds backed by the Master Settlement Agreement |
Why Are These Sectors More Common in High Yield Munis?
These sectors share a common thread: repayment is tied to a specific project's revenue (patient fees, tuition, rent) rather than a broad government tax base. That project-level dependence introduces additional credit risk, which is why these bonds carry lower ratings or go unrated.
That said, many high yield munis include structural protections like first mortgage liens, reserve fund requirements, and security covenants that provide layers of protection not always found in similarly rated corporate bonds.
How Does the Tax Exemption Affect High Yield Muni Returns?
Because interest on most munis is exempt from federal income taxes, and potentially state and local taxes, the effective yield for investors in higher brackets can be substantially greater than the stated yield. When adjusted to a taxable equivalent yield, high yield munis can meaningfully exceed what's available from corporate high yield, even before accounting for munis' historically lower default rates.
Diversification Through High Yield Munis
High yield munis also offer diversification. The sectors driving this market (healthcare, education, housing) have very different economic drivers than the consumer cyclical, communications, and energy sectors dominating corporate high yield. That divergence means high yield munis can behave differently during market stress, potentially reducing overall portfolio volatility.
The VanEck High Yield Muni ETF (HYD) provides broad exposure to this market, tracking the ICE Broad High Yield Crossover Municipal Index. The index captures the performance of the U.S. dollar-denominated high yield long-term tax-exempt bond market, with built-in features to enhance credit and liquidity, including an investment grade allocation that improves tradability. With one of the lowest expense ratios in the peer group, HYD offers a cost-efficient way to access this distinctive corner of fixed income.
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