Keep Tax Collectors at Bay with Muni Bond Funds

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published 30 June 2025

Disclaimer

Prices and other data are as of May, 2025.

You’ve got some money in bond funds. You did some shopping, and your fund is throwing off more than 4% in interest. Pretty good, considering inflation ran at 2.4% the past 12 months.

Now you talk to your accountant, who reminds you that you’re in the 32% tax bracket. Oops. Your 4% yield is now 2.7%. Back out inflation and you’re earning just 0.3%. On a $10,000 investment, that’s a return after taxes and inflation of $30. Take your best friend to dinner at McDonald’s.

You can’t do much about inflation, but you can do something about taxes — with municipal bonds. “For years, the only reason to own bonds was diversification,” says Jim Murphy, lead portfolio manager for municipal bonds at T. Rowe Price. But now, they’re good inflation insurance. Some high-yield municipal bond funds and ETFs yield 5% or more. If you’re in the 32% tax bracket, you’d need your taxable fund to yield 7.4% to get the same return after taxes.

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Pretty tasty, right? Just remember that your high muni yield comes with a side order of risk.

Muni bonds: The risks

Muni bonds are issued by states, cities and municipal organizations, and their interest is exempt from federal income taxes. If you own a muni bond issued by your state, interest is free from federal, state and local taxes.

The main risk from any high-yield bond is that the issuer defaults and can’t pay interest or repay the principal at maturity. High-yield muni funds pick from bonds on the lower end of credit ratings, which means they're rated lower than Baa (by Moody's) or BBB (by S&P and Fitch). Municipal defaults are rare — about 0.8% since 1970, according to Fidelity Investments. Current bankruptcy law doesn’t allow states to go bankrupt, although cities and other municipal issuers can.

But the price of a muni bond can go down if buyers begin to doubt the issuer's solvency — for example, if companies such as Moody’s downgrade their credit rating. Because just 5% of the total municipal bond market is considered high yield, price drops can be rapid.

Puerto Rico’s bonds were a classic example of what can go wrong. The bonds were highly popular with muni funds because interest from them is tax-exempt in every state. In 2015, prices on Puerto Rico’s bonds fell about 12%, to 68.5 cents on the dollar, on the day the island’s governor declared the debt “not payable.”

All bonds face interest rate risk. Bond prices fall when interest rates rise, and vice versa. If you own an individual bond and hold it to maturity, you don’t have to worry about rising or falling rates. If you own bonds through a fund or ETF, however, you can lose money when rates rise. (Conversely, you can gain if you sell after rates fall).

A muni fund manager has two ways to increase a fund’s yield. She can buy bonds with long maturities, or she can buy bonds with a higher default rate; both strategies tend to make the fund riskier. For example, iShares High Yield Muni Active ETF (HIMU) currently yields just over 5%. The fund sometimes holds as much as half of its portfolio in unrated bonds, according to Morningstar, and it tends to buy longer-term bonds than its peers. Capital Group Municipal High-Income ETF (CGHM) tends to buy shorter-term, higher-quality bonds. Its current yield is just under 4.5%.

If you want to see how munis fare in a rising rate environment, look at how they performed in 2022, when rates rose sharply. The Vanguard Total Bond Market ETF (BND) fell 13%. IShares National Muni Bond ETF (MUB), the largest muni bond ETF, fell over 7%, while First Trust Municipal High Income (FMHI), the largest high-yield muni bond ETF, fell almost 15%.

Municipal bonds: What to buy

Stay away from high-yield munis with high expense ratios. Every dollar you give to your fund company is one you won’t have when you need it.

Two muni ETFs that have expenses below 0.5% and yields above 4%: iShares High Yield Muni Active ETF (HIMU) and SPDR Nuveen Bloomberg High Yield Municipal Bond ETF (HYMB). Two garden-variety mutual funds that fit the bill: Eaton Vance High Yield Municipal (EWHYX) and T. Rowe Price Intermediate Term High Yield (PRIHX).

Typically, the best time to buy muni funds is when the yield of a 10-year high-grade muni bond is about 85% of that of a Treasury security with a similar term. By that measure, munis are as cheap as they have been since the economic recovery began in 2022, according to Nuveen.

Note: This item first appeared in Kiplinger Retirement Report, our popular monthly periodical that covers key concerns of affluent older Americans who are retired or preparing for retirement. Subscribe for retirement advice that’s right on the money.

John Waggoner has put personal finance and investing into plain English for more than three decades. He was a senior columnist for InvestmentNews and, prior to that, USA TODAY's personal finance columnist for 25 years. He has written for Morningstar, The Wall Street Journal, and Money magazine. Waggoner has also written three books on finance and investing. He has an undergraduate and graduate degree in English literature and is working on his Certified Financial Planner designation. He lives in Vienna, Virginia.