Your Treasury Income May Already Be Paying California, Unless You’re Holding It in This ETF

I have a soft spot for the iShares U.S. Treasury Bond ETF (BATS: GOVT), and clearly a lot of investors do too given that it now sits at roughly $41 billion in assets under management. For a 0.05% expense ratio, you get exposure to a portfolio of just over 200 Treasury bonds represented by the ICE U.S. Treasury Core Bond Index.

The ETF spans short, intermediate, and long-term Treasuries, but averages out to an effective duration of 5.54 years, implying moderate sensitivity to interest rates. Right now, GOVT is paying a respectable 4.24% 30-day SEC yield, and a big reason many investors like Treasury ETFs in taxable accounts is because Treasury interest is generally exempt from state and local income taxes.

However, there is a small catch that many retirees and income investors overlook. Fund distributions do not always cleanly isolate the Treasury portion directly on your 1099 tax form. In practice, that means some investors may end up paying unnecessary state income taxes unless they manually adjust things on their own tax returns. And if you live in a high-tax state like California, that difference can add up quickly if you’re not on top of it.

So if you are looking for a more hassle-free solution, particularly for taxable retirement accounts, I think a California-specific municipal bond ETF can make a lot of sense. Here is how it works and one popular ETF pick from iShares to consider.

Understanding Municipal Bonds

Municipal bonds, often shortened to “munis,” are debt securities issued by state governments, cities, counties, school districts, transportation authorities, and other public entities. Generally speaking, there are two major categories.

1. The first are general obligation bonds. These are backed by the taxing power of the issuing government itself, meaning repayment is supported through mechanisms like property taxes or income taxes.
2. The second are revenue bonds. Instead of relying on taxes, these are backed by cash flow from specific projects or services such as toll roads, airports, water systems, utilities, hospitals, or transit systems.

As with corporate bonds, municipal bonds also receive credit ratings from agencies like Moody’s, S&P Global, and Fitch. Higher-rated bonds generally offer lower yields but stronger repayment confidence, whereas lower-rated bonds compensate investors with higher yields for taking more credit risk.

The biggest attraction for many retirees, though, is the tax treatment. Most municipal bond interest is exempt from federal income taxes and often exempt from the alternative minimum tax as well. And if you live in a particular state and own a municipal bond ETF investing specifically in bonds issued by that same state, the income can also be exempt from state income taxes.

The Bond ETF to Consider

For California residents, one compelling option is the iShares California Muni Bond ETF (NYSEARCA: CMF). CMF charges a modest 0.08% expense ratio to track the ICE AMT-Free California Municipal Bond Index. This benchmark includes more than 1,500 California municipal bonds with an intermediate duration of 6.19 years.

The portfolio spans issuers across the state, including entities like the University of California system, the Los Angeles Department of Water and Power, the San Diego Unified School District, the Bay Area Toll Authority, and many others. Importantly, the portfolio remains investment grade overall, with the majority of holdings rated AA.

Now admittedly, the headline 3.14% 30-day SEC yield is probably not going to impress income investors. But the 30-day SEC yield is not the correct metric to use for a municipal bond ETF. iShares also discloses a tax-equivalent yield, which estimates what a fully taxable bond fund would need to yield in order to match CMF’s after-tax income.

For state-specific municipal bond ETFs like CMF, iShares’ calculation methodology assumes the highest federal individual income tax rate combined with California’s top state income tax bracket. Based on that methodology, CMF’s tax-equivalent yield works out to 6.84% as of May 19th.

In short, when evaluating bond ETFs in retirement, especially for income inside taxable accounts, the question is not simply “What yield does this fund pay?” The better question is “How much of that yield do I actually keep after taxes?” For California residents, picking the right bond ETF can save you thousands.