SUB vs TAXX

SUBAiShares Short-Term National Muni Bond ETF

TAXXCBondBloxx IR+M Tax-Aware Short Duration ETF

In short

SUB Munis, but only the near end of the curve. Since 2008 SUB has tracked an AMT-free index of investment-grade municipal bonds maturing inside five years, paying tax-exempt income monthly with far less rate sensitivity than long-dated muni funds.

TAXX Most muni ETFs can only buy munis. TAXX is run actively to chase the best after-tax income across two markets, keeping at least half in federally tax-exempt bonds and the rest in short-duration taxable debt.

Stated mandate

SUB The fund seeks to track an index of short-term, investment-grade U.S. municipal bonds maturing from one month through five years, providing tax-exempt income while managing interest-rate risk.

TAXX The Fund seeks attractive after-tax income while preserving capital. It is actively managed and invests in diversified municipal and taxable short-duration fixed-income securities, normally allocating at least 50% of assets to federally tax-exempt municipal securities.

Why people hold it

• SUB Charges 0.07% a year against a category median near 0.30%. On tax-exempt bond income, that fee gap is a meaningful slice of what actually reaches you.
• Two dials set on purpose: maturities from one month to five years, and an AMT-free index, so neither rate swings nor the alternative minimum tax hit the same way.ishares.com
• A multi-billion-dollar fund running since 2008 under iShares, with tight tracking of its ICE benchmark. One of the sturdier implementations in the muni group.
• Pays monthly, so the tax-exempt income arrives on a regular cadence rather than in quarterly lumps.

• TAXX Hunts income in two markets: at least 50% federally tax-exempt munis, the rest short-duration taxable bonds, with a manager choosing whichever pays more after tax.
• Short duration by design, with capital preservation written into the stated objective, so less rate whiplash than long-dated muni portfolios carry.
• No index to hug. The mix can shift as the tax math between munis and taxable bonds changes, rather than sitting where a benchmark says to sit.

Worth knowing

• SUB The five-year ceiling is the whole design, and it cuts both ways: less rate sensitivity, but a shorter stretch of the curve to draw income from than full-maturity muni funds.
• This is a national portfolio. Single-state funds like NYF chase a home-state tax break that a nationwide muni basket cannot offer.
• Broad-maturity peers VTEB and SCMB run at 0.03%. The short-end tilt here costs a few basis points more.

• TAXX At 0.35% a year, it costs more than plain-vanilla muni index trackers like VTEB and SCMB at 0.03%, and fees bite harder in short-duration bonds.
• Launched in 2024, so its track record is short and hasn't been tested across a full rate cycle.
• Payouts come on an irregular schedule rather than the fixed monthly rhythm many muni funds keep, so income timing takes planning.

Full SUB profile⁠

Full TAXX profile⁠