American Century California Municipal Bond ETF (CATF)

What exactly is CATF investing in?

The fund holds a portfolio of municipal bonds — debt issued by California’s state government, cities, counties, school districts, water agencies, and other public authorities. These are IOUs that fund schools, roads, transit, water systems, and hospitals. The bonds in the fund are required to be investment-grade, meaning they carry a sufficiently low credit risk according to rating agencies. CATF’s portfolio typically holds eighty to a hundred individual bonds, spread across many different California issuers and bond types.

Why would anyone buy California-specific bonds?

The core appeal is tax treatment. Interest paid on municipal bonds issued within your state is exempt from federal income tax and from that state’s income tax. A California investor buying CATF pays no federal tax on the interest, and no California state income tax either. That double tax exemption can significantly boost the after-tax yield, especially for high-income investors in high-tax states. An investor in the top federal bracket in California might find a 4% yield on a California muni bond more attractive than a 6% yield on a taxable bond, depending on their specific tax rate. For investors in other states, the bonds still enjoy federal tax exemption, but they miss the state tax advantage.

What are the risks here?

Credit risk is the primary worry. If a California school district or water agency struggles financially, it might default on its bonds. Investment-grade ratings provide some protection, but they are not a guarantee. The fund does diversify across many issuers, which reduces the impact of any single failure. Interest-rate risk is the second: if interest rates rise after you buy, the bond’s market value falls, because new bonds will pay higher coupons. If you hold to maturity you get par back, but if you need to sell before then you may take a loss. Inflation risk touches all bonds: a fixed-rate coupon loses purchasing power as prices rise. California-specific risks matter too — the state’s budget health, pension obligations, and the economic fortunes of its major cities all affect the municipalities that issued the bonds in the portfolio.

How does CATF trade and what does it cost?

The fund trades on an exchange like a stock, and its price moves with interest rates and credit conditions. The expense ratio is typically under 0.50%, which is reasonable for an actively managed muni bond fund. Because these are bonds paying regular interest, the fund generates distributions that are passed to shareholders, and those distributions are tax-exempt at the federal level and (for California residents) at the state level. The fund has reasonable liquidity, though not as deep as a Treasury bond ETF, and spreads between bid and ask prices are usually tight.

Who is this fund really for?

CATF is most attractive to California residents with substantial income who benefit from state tax exemption, or to any investor seeking tax-exempt income backed by investment-grade California debt. It is not suitable for tax-sheltered accounts like IRAs, where the tax exemption has no value. It is also not a core holding for someone with no state tax obligation or who lives outside California. For those who need to understand it, the fund’s prospectus, annual reports, and fact sheet lay out the bond holdings and their credit ratings. The bond ladder and maturity distribution are available in the holdings list, which helps assess duration and interest-rate risk.