🤝 BFF Take
VTEB Wins on Cost — MUB Only Makes Sense for Options Liquidity
MUB (iShares National Muni Bond ETF) and VTEB (Vanguard Tax-Exempt Bond ETF) both provide exposure to the US investment-grade municipal bond market — state and local government bonds with federally tax-exempt interest. MUB tracks the ICE AMT-Free US National Municipal Index with ~3,500 bonds; VTEB tracks the Standard & Poor's National AMT-Free Municipal Bond Index with ~6,500+ bonds. VTEB charges 0.03% vs MUB's 0.07% — more than double the fee for similar exposure. MUB has larger AUM ($28B vs $12B for VTEB) and a more developed options market. For long-term tax-exempt income investors, VTEB's lower cost is the clear winner. MUB only makes sense if you need options liquidity for tactical municipal bond positioning.
📋 Quick Takeaways
🏛️Both hold investment-grade municipal bonds — federally tax-exempt interest income; nearly identical exposure
💰VTEB costs 0.03% vs MUB's 0.07% — VTEB is more than 2x cheaper for very similar muni bond exposure
📊VTEB holds 6,500+ bonds vs MUB's 3,500 — broader diversification within the muni market
📊 Data-Based Take: VTEB has the lower fee
Whether the lower-cost fund suits your situation depends on your existing holdings, account type, tax situation, and how you use each fund. This is a cost comparison, not a personalized recommendation.
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Reviewed by a CFA® Charterholder · Data updated Jun 2026 · Educational only, not financial advice
MUB
iShares National Muni Bond ETF
VTEB
Vanguard Tax-Exempt Bond ETF
📋 MUB vs VTEB — Key Facts Side by Side
| Metric |
MUB |
VTEB |
| Fund Name |
iShares National Muni Bond ETF |
Vanguard Tax-Exempt Bond ETF |
| Issuer |
iShares |
Vanguard |
| Tracks Index |
ICE AMT-Free US National Municipal |
S&P National AMT-Free Municipal Bond |
| Expense Ratio |
0.07% |
0.03% ✓ |
| Cost per $10K/yr |
$7.00 |
$3.00 |
| AUM |
$28B |
$12B |
| Holdings |
3,500 |
6,500 |
| Inception |
2007 |
2015 |
| 1-Year Return |
+2.80% |
+2.90% |
| 3-Year Return |
-0.40% |
-0.30% |
| 5-Year Return |
+0.80% |
+0.90% |
| Avg Bid-Ask Spread |
0.01% |
0.01% |
Data from ETF BFF database. Returns are annualised. Not investment advice.
📊 MUB vs VTEB — Annualised Returns
Annualised returns (trailing, price-based). Past performance does not guarantee future results.
🎯 Should You Buy MUB or VTEB?
Choose if...
MUB
- You want income and stability with lower portfolio volatility
- You already use iShares and prefer staying within their fund family
Choose if...
VTEB
- You want the lowest fees — saves ~$4/yr per $10K vs MUB
- You want broader diversification (6,500 holdings vs 3,500)
- You want income and stability with lower portfolio volatility
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❓ MUB vs VTEB — Frequently Asked Questions
Who should invest in municipal bond ETFs like MUB and VTEB?
Municipal bonds are most beneficial for investors in high tax brackets (32%+) who hold bonds in taxable accounts. The tax-exempt interest from munis is worth more to someone in the 37% bracket than to someone in the 12% bracket. In tax-advantaged accounts (IRA, 401k), taxable bonds often yield more than munis on an after-tax basis — so MUB/VTEB are typically not the right choice for tax-advantaged accounts.
Are municipal bonds safe?
MUB and VTEB hold investment-grade municipal bonds — the highest quality muni bonds from creditworthy state and local governments. Default rates on investment-grade munis are extremely low historically (well below investment-grade corporate bonds). However, muni bonds are not risk-free — they carry interest rate risk (prices fall when rates rise) and credit risk from individual issuers. The 2022-2023 rate hike cycle caused meaningful price declines in muni ETFs despite their high credit quality.
What is the tax-equivalent yield of MUB and VTEB?
To compare muni yields to taxable bond yields, use the tax-equivalent yield formula: muni yield ÷ (1 - your tax rate). If MUB/VTEB yield 3.5% and you're in the 37% federal bracket, the tax-equivalent yield is 3.5% ÷ 0.63 = 5.56%. Compare that to taxable bond yields at similar duration and credit quality. If taxable bonds yield less than 5.56%, munis offer better after-tax income for a 37% bracket investor.
Are there state-specific muni ETFs?
Yes — iShares offers state-specific muni ETFs for California (CMF), New York (NYF), and other high-tax states. These provide bonds exempt from both federal AND state taxes for residents of those states, increasing the tax benefit. However, they are less diversified (single-state credit concentration) and less liquid than national muni ETFs like MUB and VTEB. For residents of high-tax states, state-specific munis can be worth the concentration risk.
How does duration affect MUB and VTEB?
Both MUB and VTEB have intermediate duration — roughly 6-7 years. This means for every 1% rise in interest rates, NAV falls approximately 6-7%. During the 2022 rate hike cycle (rates rose ~4%), both ETFs fell roughly 15-20% in NAV. Duration risk is the primary risk for muni bond investors, not credit risk. Investors who need stability should look at short-duration alternatives like VTES (Vanguard Short-Term Tax-Exempt Bond, 0.07%).
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ℹ️ Data shown is for educational purposes and may not reflect the most current figures. Returns are trailing price-based and exclude dividend reinvestment. Past performance does not guarantee future results. ETF BFF is not a licensed financial advisor — this is not personalized financial advice.