Investors considering a move from mutual funds to bond exchange-traded funds (ETFs) are part of a steadily expanding trend. In recent years, fixed-income ETFs have become a major destination for capital, reflecting a broader shift in investor preference toward the structure, flexibility and lower costs that ETFs typically offer.

Data from Morningstar Direct shows that by Oct. 31, investors had poured nearly $344 billion into fixed-income ETFs this year, more than doubling the roughly $138 billion that went into fixed-income mutual funds. The momentum is even more striking when looking at October alone: while mutual funds saw approximately $74 billion in outflows, ETFs brought in around $166 billion.

Although ETFs come with clear advantages and bonds are often considered safer than stocks, financial experts caution that understanding what you’re actually investing in is essential.

Dan Sotiroff, senior analyst for passive strategies research at Morningstar, noted that investors need to remember the purpose bonds usually serve. “The role of bonds is to act as a stabilizer in your portfolio. How much stability you need is something you determine yourself or with your advisor,” he said.

Why ETFs Are Gaining Ground

Both mutual funds and ETFs give investors access to a diversified basket of securities, but ETFs have distinct structural benefits. They tend to have lower fees, offer tax efficiencies, and trade throughout the day like stocks. Mutual funds, on the other hand, are priced only once at market close.

One major driver behind the surge in bond ETF assets is the rapid expansion of actively managed ETFs. For many years, active management—where professionals select which securities to buy—was almost exclusively associated with bond mutual funds. Today, actively managed bond ETFs are not only available but outnumber their passive counterparts.

According to Morningstar, there are now 511 actively managed bond ETFs compared to 393 passive ones. The appeal of active management, particularly in fixed income, lies in the potential for skilled managers to outperform benchmark indexes. “Active management has a legitimate advantage,” Sotiroff said. “These managers can add something different and potentially generate returns above their benchmark.”

The trade-off, however, is cost. Actively managed bond ETFs charge an average expense ratio of about 0.35%, significantly higher than the average 0.10% fee for passive bond ETFs.

Understanding What’s Inside a Bond ETF

Investors should also remember that bond ETFs distribute interest payments each month. These payments can trigger taxes if the ETF is held in a taxable brokerage account. In retirement accounts such as IRAs or 401(k)s, tax implications differ: growth is tax-deferred, with withdrawals taxed as ordinary income after age 59½. Roth IRAs offer tax-free withdrawals under qualifying conditions.

Beyond tax considerations, the type of bonds held within an ETF is critical. Investment-grade bonds—such as U.S. Treasurys and high-quality corporate bonds—carry low default risk and generally move independently of stocks. “Their correlation with equities is very low, which is an important aspect of diversification,” Sotiroff said.

High-yield bonds, often referred to as junk bonds, may deliver more income but come with much higher risk. For investors depending on steady income during retirement, the pursuit of overly high yields can introduce unnecessary volatility.

Tim Videnka, a certified financial planner and chief investment officer at Forza Wealth Management in Sarasota, Florida, emphasized prioritizing safety and liquidity for his clients. “Our clients rely on their bond ETFs to cover living expenses, so we need investments that are both high-quality and readily accessible,” he said.

The Reality: Bonds Can Decline in Value

Even though bonds are widely viewed as conservative investments, they are not immune to losses. The year 2022 was a harsh reminder of this fact. As the Federal Reserve aggressively raised interest rates to combat inflation, bond prices tumbled. Major bond indexes recorded some of their steepest declines on record.

“That year showed plainly that investors can lose money in fixed income,” Videnka said. “When fear takes hold, the market can behave in surprising ways.”

Bond prices fall when interest rates rise because newly issued bonds begin offering higher yields, rendering older bonds with lower rates less attractive. This dynamic pulls down the market value of existing bonds.

Although the Federal Reserve reduced its benchmark interest rate again in October—its second cut of the year—it still remains significantly above the near-zero levels that characterized the post-2008 financial crisis era and the early years of the pandemic.

Sotiroff noted the dramatic shift in the rate environment. “Fifteen years ago, after the financial crisis, we saw a prolonged period of 0% rates. Then during COVID, rates dropped to 0% again,” he said. “Now, with positive interest rates, bond ETFs are generating returns that many investors find compelling.”

A Market Evolving With New Opportunities

As interest rates stabilize and the ETF industry continues innovating, bond ETFs have grown into a versatile tool for a wide range of investors. Whether seeking diversification, income, or active management opportunities, investors today have more fixed-income ETF choices than ever before.

Still, professionals emphasize that due diligence is essential. Understanding the role bonds play in your portfolio, evaluating the type of bond exposure you’re taking on, and considering tax implications are all key steps in making informed investment decisions.

Bond ETFs can be a powerful component of a well-constructed portfolio, but like any asset class, they come with trade-offs. Being aware of those nuances can help investors take advantage of opportunities while managing risk effectively.