Interest Rates Rattle Muni Bond Fund Investors

 | Oct 23, 2016 01:25AM ET

Municipal bond funds are typically held for their tax-free income properties and low risk profile rather than their growth prospects. These investments are beloved and often over-weighted in large taxable accounts for their ability to skirt IRS levies that traditional bond income generates.

Yet despite this narrow investment thesis, it’s hard to ignore falling prices that quickly eat up a meager income stream and ultimately erode your total return. Such is the environment that municipal bond investors find themselves in as rising interest rates depress fund prices that peaked near the middle of 2016.

As an example, the iShares National Muni Bond ETF (NYSE:MUB is the largest diversified ETF in this field with over $7.7 billion in total assets. MUB is home to 3,200 individual municipal debt securities around the country that are primarily centered in California, New York, and Texas. This fund currently offers a 30-day SEC yield of just 1.38% and sports an effective duration of 6.21 years. It’s essentially a large, diversified, and transparent way to view the broad state of the municipal bond market.

As you can see on the chart below, MUB has declined 2% from its all-time peak and is in the process of testing its 200-day moving average. In just a manner of three months, this portfolio has managed to give back over a full years’ worth of income and is in jeopardy of breaking its long-term trend line.