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MARKETS
August 27, 2025

Weekly Municipal Monitor—Valuation Swings Underscore Active Opportunities

By Sam Weitzman

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Macros, Markets and Munis

Munis posted positive returns but underperformed Treasuries last week. Fixed-income markets were focused on Federal Reserve (Fed) Chair Jerome Powell’s speech at this year’s Jackson Hole Symposium amid a quiet week of economic data. Jobless claims moved higher while housing sales came in above expectations. At Jackson Hole, Powell indicated that the “shifting balance of risks may warrant adjusting our policy stance.” Treasuries rallied across the curve during the week. Municipals underperformed Treasuries as the yield curve steepened, with high-grade yields generally moving lower in short maturities and slightly higher in the long end. Meanwhile, municipal demand improved and supply declined while remaining elevated. This week we touch on significant performance differences across the municipal market, underscoring the potential value of active management.

Muni Funds Post Outflows as Supply Remained Elevated

Fund Flows ($2 billion of net inflows): During the week ending August 20, weekly reporting municipal mutual funds recorded $2.3 billion of net inflows, according to Lipper. Long-term, intermediate and short-term categories recorded $2.0 billion, $154 million and $130 million of inflows, respectively. Last week’s inflows led year-to-date (YTD) inflows higher to $23 billion.

Supply (YTD supply of $379 billion; up 23% YoY): The muni market recorded $9 billion of new-issue supply last week, marking the first week of less than $10 billion issuance since the July 4 holiday. The YTD new-issue supply of $379 billion is 23% higher than the prior year, with tax-exempt issuance up 25% year-over-year (YoY) and taxable issuance up 1%, respectively. This week’s calendar is expected to remain elevated at $12 billion. The largest deals include $1.8 billion State of Illinois General Obligation Bond and $1.4 billion Massachusetts School Building Authority transactions.

This Week in Munis: Valuation Swings Underscore Active Opportunities

The municipal market’s 0.1% YTD total return appears relatively unremarkable, but peeling back the layers of the fragmented muni market provides a more dynamic story that underscores the value of active management this year.

Exhibit 1: Bloomberg Municipal Bond Index Returns by Maturity
Bloomberg Municipal Bond Index Returns by Maturity
Source: Bloomberg. As of 23 Aug 25. Select the image to expand the view.

As highlighted in our recent post on yield-curve steepening, the front end of the municipal bond yield curve has significantly outperformed longer maturities. The Bloomberg 5-Year Municipal Bond Index (4- to 6-year maturities) led with a 3.87% return YTD through August 22, while the Bloomberg 22+ Year Municipal Bond Index returned -3.94%, a nearly 8% performance gap driven by curve exposure. Sector performance also varied, with the industrial revenue sector gaining 2.58% YTD, outpacing the health care sector, which returned -1.48% amid federal funding concerns, resulting in a 4.06% return differential.

Exhibit 2: AAA Muni YTW Change, AAA Muni Taxable-Equivalent Yield vs. Treasury Yield
AAA Muni YTW Change, AAA Muni Taxable-Eqivalent Yield vs. Treasury Yield
Source: Bloomberg, Western Asset. As of 23 Aug 25. Yield-to-worst (YTW) is the lowest potential yield that can be received on a bond without the issuer actually defaulting. Taxable-equivalent yield reflects an effective top marginal tax rate of 40.8%. Select the image to expand the view.

The municipal market’s significant performance disparities over the past year underscore the value of active management and highlight evolving valuation opportunities. Strong performance at the front end of the yield curve has driven down the 1-year AAA municipal rate by 77 basis points (bps) YTD to 2.22%, equivalent to a taxable-equivalent yield of 3.75% for individuals in the top marginal tax bracket, less attractive than the 1-year Treasury yield of 4.04%. Conversely, the 30-year AAA tax-exempt municipal yield has risen 79 bps to 4.66%, equivalent to 7.87% on a taxable basis, surpassing the 30-year Treasury yield of 4.98% by 289 bps. As valuations diverge across fixed-income markets, Western Asset offers a comprehensive suite of solutions to navigate these trends in both municipal and taxable fixed-income markets that can provide for more favorable after-tax outcomes.

Municipal Credit Curves and Relative Value

Exhibit 3: Muni Credit Curves
Muni Credit Curves
Source: Bloomberg, Western Asset. As of 22 Aug 25. Bloomberg Valuation Service (BVAL) Municipal Credit Indices (AAA, AA, A, BBB, respectively) and US Sovereign Curves. Taxable-Equivalent Muni Credit Curves consider the top marginal effective tax rate of 40.8%. AA Muni is represented by the US General Obligation AA Muni BVAL Yield Curve. The BVAL curve is populated with pricing from uninsured AA General Obligation bonds. A Muni is represented by the US General Obligation A Muni BVAL Yield Curve. The BVAL curve is populated with pricing from uninsured A General Obligation bonds. BBB Muni is represented by the US General Obligation BBB Muni BVAL Yield Curve. The BVAL curve is populated with pricing from uninsured BBB General Obligation bonds. Indices are unmanaged and one cannot directly invest in them. They do not include fees, expenses or sales charges. Past performance is not an indicator or a guarantee of future results. Select the image to expand the view.
Exhibit 4: Taxable-Equivalent Muni Credit Curves
Taxable-Equivalent Muni Credit Curves
Source: Bloomberg, Western Asset. As of 22 Aug 25. Bloomberg Valuation Service (BVAL) Municipal Credit Indices (AAA, AA, A, BBB, respectively) and US Sovereign Curves. Taxable-Equivalent Muni Credit Curves consider the top marginal effective tax rate of 40.8%. AA Muni is represented by the US General Obligation AA Muni BVAL Yield Curve. The BVAL curve is populated with pricing from uninsured AA General Obligation bonds. A Muni is represented by the US General Obligation A Muni BVAL Yield Curve. The BVAL curve is populated with pricing from uninsured A General Obligation bonds. BBB Muni is represented by the US General Obligation BBB Muni BVAL Yield Curve. The BVAL curve is populated with pricing from uninsured BBB General Obligation bonds. Indices are unmanaged and one cannot directly invest in them. They do not include fees, expenses or sales charges. Past performance is not an indicator or a guarantee of future results. Select the image to expand the view.
Exhibit 5: AAA Munis vs. Treasuries
AAA Munis vs. Treasuries
Source: Muni Yields: Thomson Reuters MMD, Treasury Yields: Bloomberg. As of 22 Aug 25. Past performance is not a guarantee of future results. It is not possible to invest directly in an index. Select the image to expand the view.
Exhibit 6: Tax-Exempt and Taxable Muni Valuations
Tax-Exempt and Taxable Muni Valuations
Source: Bloomberg, Western Asset. As of 22 Aug 25. Yield-to-worst (YTW) is the lowest potential yield that can be received on a bond without the issuer actually defaulting. AAA, AA, A, BBB Corporate Indices; After-Tax Yield assumes a top effective tax rate of 40.8%. Taxable Muni Index Corporate comparable used is the Global Corporate Aggregate (ex. BBB) to better align credit quality and duration. Select the image to expand the view.

Western Asset Key Themes for Muni Investors

Theme #1: Municipal taxable-equivalent yields and income opportunities remain near decade-high levels.

Exhibit 7: Muni and Taxable-Equivalent Muni Yield-to-Worst
Muni and Taxable-Equivalent Muni Yield-to-Worst
Source: Bloomberg, Western Asset. As of 22 Aug 25. Bloomberg Municipal Bond Index yield considering highest marginal tax rate of 40.8%. Indexes are unmanaged and one cannot directly invest in them. They do not include fees, expenses or sales charges. Past performance is not an indicator or a guarantee of future results. Select the image to expand the view.

Theme #2: The AAA muni curve has steepened, offering better value in intermediate and longer maturities.

Exhibit 8: AAA Municipal vs. Treasury Yield Curves
AAA Municipal vs. Treasury Yield Curves
Source: Bloomberg, Western Asset. As of 22 Aug 25. Bloomberg Valuation Service (BVAL) AAA Muni Curve and US On-/Off-the-Run Sovereign Curve. Indexes are unmanaged and one cannot directly invest in them. They do not include fees, expenses or sales charges. Past performance is not an indicator or a guarantee of future results. Select the image to expand the view.

Theme #3: Munis offer attractive after-tax yield compared to taxable alternatives.

Exhibit 9: Municipal vs. Taxable Fixed-Income Yields by Quality
Municipal vs. Taxable Fixed-Income Yields by Quality
Source: Western Asset, Bloomberg. As of 22 Aug 25. 10- and 30-Year comparison reflects Bloomberg Valuation Service (BVAL) AAA Muni Curve and US On-/Off-the-Run Sovereign Curve. AA Muni reflects the Bloomberg AA Muni Bond Index. A Muni reflects the Bloomberg A Muni Bond Index. BBB Muni reflects the Bloomberg BBB Muni Bond Index. HY Muni reflects the Bloomberg High Yield Muni Bond Index. AA Corp reflects the Bloomberg AA Corporate Bond Index. A Corp reflects the Bloomberg A Corporate Bond Index. BBB Corp reflects the Bloomberg BBB Corporate Bond Index. After-tax yield considers the top marginal tax rate of 40.8%. Indexes are unmanaged and one cannot directly invest in them. They do not include fees, expenses or sales charges. Past performance is not an indicator or a guarantee of future results. Select the image to expand the view.

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