skip navigation
Blog

Stay up to date on timely topics and market events. Subscribe to our Blog now.

ECONOMY
10 June 2025

Weekly Municipal Monitor—Surging Supply

By Sam Weitzman

Stay up to date on timely topics and market events. Subscribe to our Blog now.

Macros, Markets and Munis

Municipals posted negative returns last week as Treasury yields moved 4-16 basis points higher across the curve. The municipal yield curve only followed suit in longer maturities, with shorter-term municipal yields moving lower despite record supply conditions. Economic trends did not show signs of further slowing last week as the nonfarm payrolls came in higher than expected with 139,000 jobs and the unemployment rate remained unchanged at 4.2%. This week we highlight the elevated supply observed this month (and year).

Muni Issuance Ranked the Second Highest on Record

Fund Flows (up $426 million): During the week ending June 4, weekly reporting municipal mutual funds recorded $426 million of net inflows, according to Lipper. Long-term funds recorded $45 million of inflows, intermediate funds recorded $110 million of inflows and high-yield funds recorded $281 million of inflows. Last week marks a sixth consecutive week of positive flows to munis and led year-to-date (YTD) inflows higher to $8 billion. In addition to the week of inflows, seasonally elevated coupon reinvestment helped absorb elevated supply levels in the market.

Supply (YTD supply of $243 billion; up 27% YoY): The muni market recorded over $20 billion of new-issue supply last week, the second highest week of issuance on record, according to Bloomberg data. This week’s calendar is expected to remain elevated at $19 billion. The largest deals include $700 million Los Angeles County Revenue Anticipation Notes and $659 million Blackbelt Energy Gas District transactions.

This Week in Munis: Surging Supply

Last week’s municipal bond issuance reached the second-highest weekly level on record, and this week’s supply is expected to remain elevated. The sustained increase in new issuance builds on last year’s record levels. YTD, the municipal market has recorded $243 billion of new issuance, representing a 27% increase year-over-year (YoY), and a pace that is set to reach $549 billion by year-end.

Exhibit 1: Municipal Supply
Municipal Supply
Source: Bloomberg, Western Asset. As of 07 Jun 25. Select the image to expand the view.

Western Asset attributes the recent elevated supply conditions to a rebound from the relatively low supply levels seen during the 2022 and 2023 rate hiking cycle, as well as to uncertainties around future federal tax policies. These uncertainties may have prompted issuers to accelerate issuance plans (as previously highlighted in our recent blog post about higher education).

These record supply levels have contributed to municipal market underperformance relative to other fixed-income asset classes this year. However, most market participants were surprised by how well the market absorbed the near-record weekly issuance and outperformance last week. We anticipate that supply could decelerate into July and August, which combined with the current pace of demand, could reverse some of the market underperformance observed earlier in the year.

For now, the elevated issuance has delivered attractive tax-exempt income opportunities and after-tax relative value. The Bloomberg Municipal Bond Index, the New York Municipal Bond Index and the California Municipal Bond Index maintain average yields of 4.05%, 4.10% and 3.89%, respectively, which are equivalent to 6.84%, 8.49% and 8.47% on a taxable-equivalent basis for top taxpayers. These taxable-equivalent yield opportunities well exceed other investment-grade fixed-income opportunities, which we expect will help support demand in the back half of the year.

Exhibit 2: Taxable-Equivalent Yield Comparison
Taxable-Equivalent Yield Comparison
Source: Bloomberg, Western Asset. As of 06 Jun 25. Taxable-Equivalent Yield reflects the highest national marginal tax rate, and for New York and California Indices, the top state tax rates of 10.9% and 13.3%, respectively. Select the image to expand the view.

Municipal Credit Curves and Relative Value

Exhibit 3: Muni Credit Curves
Muni Credit Curves
Source: Bloomberg, Western Asset. As of 06 Jun 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 06 Jun 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 06 Jun 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 06 Jun 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 06 Jun 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 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 06 Jun 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 06 Jun 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.

© Western Asset Management Company, LLC 2025. The information contained in these materials ("the materials") is intended for the exclusive use of the designated recipient ("the recipient"). This information is proprietary and confidential and may contain commercially sensitive information, and may not be copied, reproduced or republished, in whole or in part, without the prior written consent of Western Asset Management Company ("Western Asset").
Past performance does not predict future returns. These materials should not be deemed to be a prediction or projection of future performance. These materials are intended for investment professionals including professional clients, eligible counterparties, and qualified investors only.
These materials have been produced for illustrative and informational purposes only. These materials contain Western Asset's opinions and beliefs as of the date designated on the materials; these views are subject to change and may not reflect real-time market developments and investment views.
Third party data may be used throughout the materials, and this data is believed to be accurate to the best of Western Asset's knowledge at the time of publication, but cannot be guaranteed. These materials may also contain strategy or product awards or rankings from independent third parties or industry publications which are based on unbiased quantitative and/or qualitative information determined independently by each third party or publication. In some cases, Western Asset may subscribe to these third party's standard industry services or publications. These standard subscriptions and services are available to all asset managers and do not influence rankings or awards in any way.
Investment strategies or products discussed herein may involve a high degree of risk, including the loss of some or all capital. Investments in any products or strategies described in these materials may be volatile, and investors should have the financial ability and willingness to accept such risks.
Unless otherwise noted, investment performance contained in these materials is reflective of a strategy composite. All other strategy data and information included in these materials reflects a representative portfolio which is an account in the composite that Western Asset believes most closely reflects the current portfolio management style of the strategy. Performance is not a consideration in the selection of the representative portfolio. The characteristics of the representative portfolio shown may differ from other accounts in the composite. Information regarding the representative portfolio and the other accounts in the composite are available upon request. Statements in these materials should not be considered investment advice. References, either general or specific, to securities and/or issuers in the materials are for illustrative purposes only and are not intended to be, and should not be interpreted as, recommendation to purchase or sell such securities. Employees and/or clients of Western Asset may have a position in the securities or issuers mentioned.
These materials are not intended to provide, and should not be relied on for, accounting, legal, tax, investment or other advice. The recipient should consult its own counsel, accountant, investment, tax, and any other advisers for this advice, including economic risks and merits, related to making an investment with Western Asset. The recipient is responsible for observing the applicable laws and regulations of their country of residence.
Founded in 1971, Western Asset Management Company is a global fixed-income investment manager with offices in Pasadena, New York, London, Singapore, Tokyo, Melbourne, São Paulo, Hong Kong, and Zürich. Western Asset is a wholly owned subsidiary of Franklin Resources, Inc. but operates autonomously. Western Asset is comprised of six legal entities across the globe, each with distinct regional registrations: Western Asset Management Company, LLC, a registered Investment Adviser with the Securities and Exchange Commission; Western Asset Management Company Ltda. is regulated by Comissão de Valores Mobiliários; Western Asset Management Company Pty Ltd ABN 41 117 767 923 is the holder of the Australian Financial Services License 303160; Western Asset Management Company Pte. Ltd. Co. Reg. No. 200007692R is a holder of a Capital Markets Services License for fund management and regulated by the Monetary Authority of Singapore; Western Asset Management Company Ltd, a registered Financial Instruments Business Operator and regulated by the Financial Services Agency of Japan; and Western Asset Management Company Limited is authorised and regulated by the Financial Conduct Authority ("FCA") (FRN 145930). This communication is intended for distribution to Professional Clients only if deemed to be a financial promotion in the UK as defined by the FCA. This communication may also be intended for certain EEA countries where Western Asset has been granted permission to do so. For the current list of the approved EEA countries please contact Western Asset at +44 (0)20 7422 3000.