High Earners Skip Treasuries for 3.9% Tax-Free Yield in Municipal Bonds

For investors in the top federal tax bracket, the Invesco National AMT-Free Municipal Bond ETF (NYSEARCA:PZA | PZA Price Prediction) offers something rare: a monthly paycheck the IRS cannot touch. PZA tracks investment-grade U.S. municipal bonds exempt from federal income tax and shielded from the Alternative Minimum Tax, and it has paid 217+ consecutive monthly distributions since November 2007. With a tax-free yield around 3.9%, PZA competes with taxable Treasuries that yield more on paper but less after taxes. The question is whether that monthly check is durable.

How PZA Generates Its Tax-Free Yield

PZA holds investment-grade municipal bonds issued by states, cities, school districts, water authorities, and other public entities. The fund tracks the ICE BofAML National Long-Term Core Plus Municipal Securities Index, screening for AMT-free issues so high earners keep the full coupon. Income flows monthly from semiannual interest on underlying bonds. The expense ratio is 0.28%, higher than ultra-cheap rivals but modest given the active credit work involved.

For a 37% bracket investor, a 3.9% tax-free yield equates to roughly 6.2% on a taxable bond. That spread is why muni ETFs exist, and it widens when Treasury yields rise.

Credit Quality and Distribution Durability

Muni defaults among investment-grade issuers are historically rare. State and local tax bases, dedicated revenue streams, and federal backstops during stress have kept default rates a fraction of comparable corporate credit. PZA’s index excludes high-yield and AMT-subject paper, leaning toward general obligation bonds and essential-service revenue bonds, the most boring corner of fixed income, which is exactly what an income investor wants.

The distribution has been consistent. Full-year payouts climbed from about $0.73 in 2023 to $0.78 in 2024 to $0.84 in 2025, reflecting higher coupons on bonds purchased during the recent rate-hiking cycle. Year-to-date 2026 distributions total about $0.28 through April, tracking in line with last year.

Interest Rate and Call Risk

The real risk to PZA holders is duration. PZA owns long-dated munis, so NAV moves sharply when long-term yields shift. The 10-year Treasury sits near 4.5%, around the upper end of its 12-month range, and the 30-year is near 5%. Rising long yields pressure muni prices even when the Fed cuts short rates, which it has done moving the funds rate from 4.5% to 3.75% over the past eight months.

Call risk is another quiet drag. Many munis carry 10-year call provisions. When rates fall, issuers refinance, forcing PZA to reinvest at lower yields. This gradually erodes distribution power over time and is the single biggest reason a muni ETF’s payout drifts rather than compounds like a stock dividend.

Total Return Reality Check

Total return matters as much as the coupon. PZA shares trade around $23, up 6% over the past year and 1% year-to-date. Look further out and the picture cools: the five-year price return is essentially flat, a reminder that long-duration bond funds absorbed one of the worst rate shocks in muni history during 2022 and 2023. The 10-year holders fared better, with a 19% price gain plus a decade of tax-free coupons on top.

The Verdict

PZA’s distribution is safe. Credit risk is minimal in an investment-grade AMT-free portfolio, the monthly cadence has held through 18 years including a pandemic and the fastest rate-hiking cycle in 40 years, and 2025 payouts hit a multi-year high. The risk sits in NAV. If you need steady tax-free income in a taxable account and can tolerate price volatility from long duration, PZA delivers. Cost-sensitive investors can compare the Vanguard Tax-Exempt Bond ETF (NYSEARCA:VTEB) or the Schwab Municipal Bond ETF (NYSEARCA:SCMB), both charging a fraction of PZA’s 0.28% but tracking different indices with shorter average duration.