DFNM vs VTEB

DFNMADimensional National Municipal Bond ETF

VTEBAVanguard Tax-Exempt Bond ETF

In short

DFNM Active muni management on a short leash. Dimensional leans longer on the curve when longer bonds pay for the risk, but keeps duration inside a band anchored to an intermediate AMT-free muni index.

VTEB Vanguard's national muni index fund, running since 2015 at three basis points, a tenth of what the typical muni ETF charges. Its benchmark screens for investment-grade bonds whose income is exempt from federal tax and the AMT.

Stated mandate

DFNM The fund seeks current income expected to be exempt from federal income tax.

VTEB VTEB seeks to track an index measuring the investment-grade segment of the U.S. municipal bond market. It uses passive sampling to approximate the index and generally invests in federally tax-exempt municipal securities.

Why people hold it

• DFNM The mechanism: when the expected term premium favors longer maturities it focuses there, otherwise shorter, all inside a documented duration band around its benchmark.sec.gov
• 0.17% net (0.18% gross, net of a waiver through February 28, 2027) sits below the muni category median fee, which is unusual for a fund with a manager making calls.
• Roughly 1,000 bonds, investment grade at purchase, with no stated intent to hold munis whose interest is subject to the federal AMT. Income pays monthly.sec.gov

• VTEB Three basis points a year against a 0.30% muni-ETF median. On tax-exempt bonds, where coupons are modest, that fee gap is a real slice of the payout.
• The index holds only investment-grade munis whose interest is exempt from federal income tax and the alternative minimum tax, so the income carries no AMT surprise.vanguard.com
• A multi-billion-dollar fund and one of the most heavily traded in the muni category, which tends to show up as tight bid-ask spreads. Income is paid monthly.
• It has tracked its benchmark closely and sits among the strongest implementations in a crowded muni bond peer group.

Worth knowing

• DFNM Index rivals charge less: VTEB and SCMB 0.03%, MUB 0.05%. The systematic curve and credit work is what the extra cost buys.
• Intermediate rate risk is baked in. The band allows duration a half year above or a full year below the benchmark's, so prices move when yields do.sec.gov
• Federal exemption is the target, not state. Dimensional houses state-level breaks in separate funds, such as its California muni ETF.sec.gov

• VTEB Federal exemption, not blanket coverage. Income can still be taxable in your home state, which is why single-state funds like NYF exist alongside it.vanguard.com
• Credit quality is investment grade, so rates are the main swing factor: when muni yields rise, bond prices and the fund's share price fall.vanguard.com
• Sampling, not full replication. The fund owns a representative slice of a very large index rather than every bond in it.vanguard.com

Full DFNM profile⁠

Full VTEB profile⁠