The best Vanguard municipal bond funds for most investors start with the Vanguard Tax-Exempt Bond ETF (VTEB), which charges just 0.03% and has no meaningful minimum. If you can meet a $50,000 Admiral Shares minimum, Vanguard’s actively managed muni funds cover every duration from ultra-short to long-term at a 0.09% expense ratio, plus state-specific options for residents of high-tax states. Which one fits depends on your tax bracket, your state, and how much interest rate risk you can absorb.
VTEB: The Default Starting Point
The Vanguard Tax-Exempt Bond ETF (VTEB) is the cheapest muni fund Vanguard runs, at a 0.03% expense ratio.1Vanguard. Vanguard Tax-Exempt Bond ETF It tracks the S&P National AMT-Free Municipal Bond Index, holding only investment-grade munis whose interest is exempt from federal income tax and from the federal alternative minimum tax. The AMT screen matters: Vanguard’s actively managed muni funds make no such guarantee and may hold private activity bonds that generate AMT preference income.
VTEB currently carries an average duration of 7.1 years and a 30-day SEC yield of 3.44%.1Vanguard. Vanguard Tax-Exempt Bond ETF The minimum is one share. The same strategy in mutual fund form is available as the Tax-Exempt Bond Index Fund Admiral Shares (VTEAX) at 0.07% with a $3,000 minimum.2Vanguard. Vanguard Tax-Exempt Bond Index Fund Admiral Shares For most investors the ETF wins on cost and flexibility.
The Actively Managed Lineup by Duration
Vanguard’s actively managed muni funds let managers adjust holdings based on the rate outlook and relative value. Every Admiral Shares class charges 0.09%, and most require a $50,000 minimum.3Vanguard. Share Classes of Vanguard Mutual Funds The differences that matter are duration, yield, and credit quality.
Duration is the key number. It tells you roughly how much a fund’s price will drop for every 1% rise in interest rates. A fund with a duration of six years would lose about 6% of its value if rates jumped a full point overnight.
Ultra-Short-Term Tax-Exempt Fund (VWSUX)
VWSUX works as a cash-like holding for tax-sensitive investors. Duration is just 1.2 years with a dollar-weighted average maturity between one and two years.4Vanguard. Vanguard Ultra-Short-Term Tax-Exempt Fund Admiral Shares It won’t move much when rates change, and it won’t yield much either. Vanguard is explicit that this fund carries more risk than a money market fund because it holds longer-maturity securities. Good spot for money you might need in a year or two.
Limited-Term Tax-Exempt Fund (VMLUX)
VMLUX targets a dollar-weighted average maturity between two and six years, with a current duration of 2.6 years and a 30-day SEC yield of 2.84%.5Vanguard. Vanguard Limited-Term Tax-Exempt Fund Admiral Shares It emphasizes high credit quality. For investors who want tax-exempt income but worry about rising rates, this is the sweet spot between money-market territory and a full intermediate position.
Intermediate-Term Tax-Exempt Fund (VWIUX)
VWIUX is the workhorse of the lineup. Duration is 5.8 years, with an expected dollar-weighted average maturity between 6 and 12 years, and holdings concentrated in high-quality municipal securities.6Vanguard. Vanguard Intermediate-Term Tax-Exempt Fund Admiral Shares Most investors building a muni allocation should evaluate this one first. It moves more than the limited-term fund in a rate shock, less than the long-term options.
Long-Term Tax-Exempt Fund (VWLUX)
VWLUX pushes further out on the curve, with a dollar-weighted average maturity between 10 and 25 years and a current duration of 8.3 years. The 30-day SEC yield of 3.89% is the highest among Vanguard’s investment-grade muni funds.7Vanguard. Vanguard Long-Term Tax-Exempt Fund Admiral Shares At least 75% of holdings sit in the top three credit-rating categories, though it can invest up to 20% in medium-grade bonds and a small slice in lower-rated securities. The trade-off is real. A 1% rate increase would knock roughly 8% off the fund’s price. Best for long horizons.
High-Yield Tax-Exempt Fund (VWALX)
VWALX takes a different path to higher income, accepting more credit risk by investing up to 20% of assets in bonds rated below investment grade.8Vanguard. Vanguard High-Yield Tax-Exempt Fund Admiral Shares Duration is 8.4 years with average maturity between 10 and 25 years. The remaining 80% stays in investment-grade territory, so this is milder than “high-yield” implies in the corporate world. Best fit for top-bracket investors who can stomach both credit spread moves and interest rate volatility. In the 24% bracket or below, the extra yield often doesn’t compensate for the added risk once you adjust for the tax benefit.
State-Specific Funds for High-Tax Residents
National muni funds shelter income from federal tax, not automatically from state income tax. State-specific funds provide a double exemption for in-state residents: interest free from both federal and state taxes. In cities like New York that impose a local income tax, bonds issued within the city can deliver a triple exemption.9Municipal Securities Rulemaking Board. Municipal Bond Basics
Vanguard offers state funds for several high-tax jurisdictions, including the Vanguard California Intermediate-Term Tax-Exempt Fund (VCADX) and the Vanguard New York Long-Term Tax-Exempt Fund. With top state income tax rates ranging from about 5% to over 13% in the highest-tax states, the savings can be substantial. The cost is reduced diversification: a smaller pool of issuers means more concentration risk and sometimes lower liquidity than a national fund. The higher your state rate and the larger your muni allocation, the more a state fund makes sense.
Check the Tax-Equivalent Yield Before You Buy
Muni yields look lower than taxable bond yields until you adjust for taxes. The tax-equivalent yield tells you what a taxable bond would need to pay to match a muni’s after-tax income: divide the tax-free yield by one minus your marginal federal tax rate.
For an investor in the 37% federal bracket, VTEB’s 3.44% tax-free yield translates to a tax-equivalent yield of about 5.46%.1Vanguard. Vanguard Tax-Exempt Bond ETF In the 24% bracket, the same 3.44% equates to about 4.53%. If you hold a state-specific fund in a high-tax state, add your state rate into the calculation. A California investor in the 37% federal bracket who also pays the 13.3% state rate gets an even higher tax-equivalent yield.
At lower income levels the math flips. In the 12% federal bracket, taxable bonds or Treasury securities often deliver better after-tax returns. Run this calculation before buying any muni fund.
When Municipal Bonds Are the Wrong Choice
The 2026 federal brackets range from 10% to 37%.10Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Investors in the 10% or 12% brackets almost always do better with taxable bonds or Treasuries. The crossover depends on current yields, but munis typically start becoming competitive around the 22% bracket.
Munis also don’t belong in IRAs or 401(k)s. The interest is already sheltered from current taxation in those accounts, so holding a lower-yielding muni there gives up income for a tax benefit you’d get anyway. Keep muni funds in a taxable brokerage account and put taxable bonds in your retirement accounts.
Tax Wrinkles That Catch Muni Investors Off Guard
Federal tax law excludes interest on state and local bonds from gross income, but the exclusion has more exceptions than most investors realize.11Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds Three catch people out.
Alternative Minimum Tax
Interest from private activity bonds counts as a tax preference item under the AMT. These bonds finance projects with significant private-sector use, such as airports, hospitals, or housing developments.12Office of the Law Revision Counsel. 26 USC 57 – Items of Tax Preference If your fund holds them, some of the income could feed into your AMT calculation.
For 2026, the AMT exemption is $90,100 for single filers (phasing out at $500,000) and $140,200 for married couples filing jointly (phasing out at $1,000,000).10Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 If AMT concerns you, VTEB and VTEAX both track an AMT-free index and screen out private activity bonds.1Vanguard. Vanguard Tax-Exempt Bond ETF The active funds do not.
Social Security and Medicare Premiums
Muni bond interest doesn’t appear as taxable income on your return, but it still counts in two calculations that can cost real money. First, the IRS includes tax-exempt interest in the modified adjusted gross income formula that determines how much of your Social Security benefits are taxed. Single filers whose combined income exceeds $25,000, and joint filers above $32,000, start owing tax on a portion of Social Security benefits.13Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits
Second, Medicare uses your modified adjusted gross income to calculate the Income-Related Monthly Adjustment Amount (IRMAA), a surcharge on Part B and Part D premiums that kicks in above $109,000 for single filers or $218,000 for joint filers in 2026. Tax-exempt interest from municipal bonds is included in the MAGI figure Medicare uses.14Social Security Administration. HI 01101.010 – Modified Adjusted Gross Income (MAGI) The surcharge operates as a cliff: going $1 over the threshold triggers the higher premium for the entire year. If your income sits near a boundary, adding muni income could trigger hundreds or thousands in extra Medicare costs.
Capital Gains Distributions
When a fund manager sells a bond for a profit, the capital gain flows through as a taxable distribution. The coupon interest may be tax-exempt, but capital gains from trading inside the fund are not.15Vanguard. How Government Bonds Are Taxed Same story when you sell fund shares at a gain: you owe capital gains tax on the difference between your sale price and your cost basis.