The muni renaissance runs through the top bracket

A municipal bond yielding 4.0% is worth roughly 6.6% from a taxable corporate bond to an investor in the top federal bracket, and for a resident of California, New York, or New Jersey buying in-state paper the taxable-equivalent yield climbs higher still, rivaling investment-grade credit without that credit's default risk. That arithmetic, as ETF Trends lays it out, is the engine behind the municipal market's return to favor after years in which high earners sat it out.

The rate regime did the work: with the federal funds rate holding in a 3.50% to 3.75% band, tax-exempt yields are finally high enough for the federal exemption to clear the gap against taxable bonds, a reversal ETF Trends, citing Forbes, describes as fifteen years in the making—a stretch that began when the Federal Reserve anchored short-term rates near zero and muni yields were so low that even tax exemption barely closed the difference. It is the same rate regime this publication has traced through rate-sensitive funds all year.

Demand has followed: Morningstar's US Municipal Bond Index gained 5.5% in the twelve months through July 2026, outpacing most major fixed income benchmarks, and investors put approximately $105 billion into municipal ETFs and mutual funds over the twelve months through June 2026.

That $105 billion figure lumps ETFs and mutual funds together, and the coverage does not break them apart; the passive share of the muni renaissance is unknown, and that number decides whether this rate regime feeds an index wrapper or an active one. Cheap beta has the better case. The advantage in a muni is arithmetic: it comes from the buyer's tax bracket, and it does not narrow when the expense ratio does. Active managers earn their fee on dispersion, and the credit data here points the other way.

The credit backdrop makes the passive argument more than a question of fees: state and local balance sheets came out of the pandemic in exceptional shape, per Forbes, with federal relief funds and tax revenue growth from resilient employment and property values allowing municipalities to build historically large reserves, and rating agency upgrades have consistently outpaced downgrades across the universe. That broad-based improvement is exactly what an index captures by construction and a credit picker does not want. The coverage notes that quality is not uniform across the muni market, then stops short of the evidence—fair ground for wanting more before underwriting a benchmark-hugging product.

The split—and the rate band underneath it—will decide whether this is an index story or an active one. The argument that managers defending mutual-fund shelves lose the next five years of flows is still genuinely open in tax-exempt credit, and it stays open until someone publishes the ETF-versus-mutual-fund breakdown behind that $105 billion.