First Trust Short Duration Managed Municipal ETF (FSMB)

The First Trust Short Duration Managed Municipal ETF (NASDAQ: FSMB) buys bonds issued by state and local governments across the United States. These bonds pay interest that is free from federal income tax — a valuable perk if you are in a high tax bracket. The fund focuses on shorter bonds, usually maturing in 3 to 10 years, so you get the tax break without your money being locked up for 20 or 30 years.

Why municipal bonds exist and why people buy them

States and cities need to borrow money. They issue bonds to finance schools, roads, water systems, bridges, and other infrastructure. When you buy a municipal bond, you are lending to your local government. In return, you get paid interest.

The big incentive: that interest is not subject to federal income tax. A corporate bond that yields 4 per cent costs you income tax on that 4 per cent. A municipal bond that yields 3.5 per cent costs you nothing in federal tax. For someone in a high tax bracket, the 3.5 per cent is actually more valuable than 4 per cent from a corporate bond, even though the stated yield is lower.

This tax break creates a two-tiered bond market. Wealthy individuals, endowments, and other tax-sensitive investors pile into munis. Taxable bond investors — pension funds, financial firms that are tax-exempt, foreign buyers — largely avoid them because they do not benefit from the federal tax break and can earn better yields elsewhere.

What bonds FSMB holds

FSMB focuses on what are called “general obligation” bonds and “revenue” bonds issued by healthy states and major cities. A general obligation bond is backed by the government’s ability to tax — if a state issues a GO bond, it is promising to raise taxes if necessary to pay you back. A revenue bond is backed by a specific revenue stream — a toll road bond is backed by toll revenue, a water utility bond by utility fees.

The fund excludes deeply distressed issuers and focuses on investment-grade credits — states and cities with decent finances and manageable debt loads. You will not find struggling municipal systems or speculative issuers in FSMB. The worst credits in the municipal market are still being issued (and some are worth buying if you do your homework), but FSMB’s mandate is to stay with names that have clear ability and willingness to pay.

The fund holds short-maturity bonds, mostly 3 to 10 years out. This matters. A 30-year municipal bond is extremely volatile — when interest rates move, its price swings wildly. A 5-year muni is stable. FSMB trades volatility for safety, which makes sense if you want to sleep at night or if you might need the money within a decade.

The yield picture and what you actually earn

Municipal bonds usually yield less than corporate bonds of equal credit quality. Why? The tax break. A Baa-rated corporate bond might yield 4 per cent. A Baa-rated municipal bond might yield 2.5 per cent. If you are subject to federal tax at the 37 per cent rate (the top rate), the 2.5 per cent muni is worth more to you than 4 per cent of taxable income — because you pocket the full 2.5 per cent whereas you keep only 2.5 per cent of the 4 per cent from the corporate bond.

For high-income earners, tax-exempt yield is extremely attractive. For lower-income earners, less so. FSMB makes sense for people in the top two federal tax brackets (32 per cent and 37 per cent) and for some in the 24 per cent bracket, depending on other details. If you are in a lower bracket or live in a state with no income tax, corporate bonds or Treasuries might be a better deal.

How short duration works in a rising-rate world

Duration is a measure of how much a bond’s price moves when rates change. A 10-year bond has a duration of roughly 7 or 8, meaning a 1 per cent rise in rates causes roughly a 7–8 per cent fall in price. A 5-year bond has a duration of about 4, meaning the same 1 per cent rate rise causes about a 4 per cent price drop.

FSMB’s short duration is its anchor. When the Federal Reserve raises rates, FSMB’s holdings do not fall nearly as much as longer-maturity municipal funds. When rates fall, FSMB does not capture as much price upside. It is a trade-off. In a rising-rate environment, FSMB is more defensive. In a falling-rate environment, it lags other municipal funds.

The payoff is simplicity. A holder of FSMB does not have to worry about being whipsawed by dramatic rate moves. The fund’s value stays relatively stable relative to longer-duration alternatives. That stability is worth something if you are older, retiring, or simply uncomfortable with volatility.

Municipal credit risk is real but rarer than you might think

Cities and states do run out of money. It happens. Detroit filed for bankruptcy in 2013. Stockton, California, did the same. But these were rare, dramatic exceptions. The vast majority of municipal issuers pay their debts on time. Over a typical year, the default rate on investment-grade municipal bonds is below 0.1 per cent — meaning for every 1,000 bonds, fewer than one defaults per year.

That said, credit quality varies. A healthy state like Massachusetts is a rock-solid credit. A struggling city with declining population and poor finances is much riskier. FSMB’s discipline — sticking to investment-grade names — filters out the worst credits, but does not eliminate risk entirely.

The 2023 banking turmoil and the 2024 interest-rate environment have reminded some investors that no muni is riskless. A major bank failure or recession could trigger municipal credit stress. FSMB would not be immune, though its short duration limits the damage.

Why First Trust built this specific fund

First Trust has expertise in fixed-income management and understood that many investors wanted municipal exposure without the volatility of long bonds. The short-duration muni niche is profitable: people in high brackets are willing to accept lower yields in exchange for lower volatility and less interest-rate risk. By concentrating on shorter maturities and investment-grade credits, First Trust created a product that appeals to conservative, tax-sensitive investors.

The fund is actively managed in the sense that First Trust’s managers pick which specific bonds to own (rather than mechanically indexing to a published municipal-bond index). They aim to capture tax-loss harvesting opportunities, monitor credit quality, and manage the portfolio to optimize after-tax returns. This active layer costs more than a passive index fund, but is intended to justify itself through better relative returns.

The drawbacks and who should avoid this fund

FSMB is not for everyone. If you are in a low tax bracket, the tax-exempt yield is not attractive enough to justify owning it. A corporate bond or Treasury will likely be a better value. If you need your money soon — within the next 3 years — a high-yield savings account beats any bond fund.

There is also the risk of principal loss if you need to sell before maturity. If interest rates spike and you have to sell your FSMB holdings at a loss, you suffer. This is not catastrophic (short duration limits the loss) but it is real. Bond funds are not totally safe.

Finally, tax-exempt bonds have become less attractive in recent years as Treasury yields have risen and high-income earners have more appealing options in taxable bonds. The relative value of FSMB versus alternatives has shifted; it is no longer an obvious choice for every wealthy investor.

How to research this fund

Look at First Trust’s fact sheet for the current yield, average maturity, and credit-quality breakdown. Check what states and cities are the largest holdings — this tells you what you own. If a single state dominates, you have concentration risk.

Compare FSMB’s yield to the yields on comparable Treasury securities of similar maturity. If the muni yield is not noticeably higher (at least 75 basis points higher for most brackets), the fund is not compensating you adequately for credit risk.

Review the fund’s performance in the 2020 pandemic and 2023 banking-crisis periods. Did FSMB hold up reasonably well, or did it suffer sharp drawdowns? That history suggests how it will behave in the next crisis.

Finally, ask yourself: do I benefit from federal tax-exempt income? If yes, FSMB is worth considering. If no, you are likely better served by a corporate bond fund or shorter Treasury ladder.