It is a defined-maturity bond ETF made up of US municipal bonds that mature in December 2030. It pools municipal bonds with a set maturity date, seeks tax-exempt interest income, and returns principal at maturity.

It suits US taxable investors who want to invest in municipal bonds with a set maturity date and collect tax-exempt interest until maturity.

It is a passively managed (index-tracking) ETF run by iShares.

The fund holds a pool of US municipal bonds maturing in December 2030 and returns principal at maturity under a defined-maturity structure. As maturity approaches, duration shortens, and the structure seeks tax-exempt interest that is exempt from federal income tax for US taxable investors.

• Fixed 2030 maturity structure
• Seeks tax-exempt municipal bond interest

Assets under management (AUM) stand at $392.3M, and the total expense ratio is 0.10% per year.

Compared with general municipal bond ETFs that have no set maturity, the main points of comparison are the defined-maturity structure and the return of principal at maturity.

Municipal bonds are driven by interest rates, credit conditions, and tax policy: prices tend to rise when rates fall and decline when rates rise. A defined-maturity structure has the characteristic that interest-rate sensitivity shrinks as maturity nears, so price swings become smaller.

Fund flows into municipal bonds diverge depending on the rate environment, tax policy, and demand for tax-exempt income, and money sometimes moves into defined-maturity products when demand for matching a specific maturity date grows. It is also worth watching how performance varies with interest-rate and credit conditions.

A fixed maturity and tax-exempt interest are the strengths, while interest-rate risk, credit risk, and reliance on tax treatment are considerations.

For exposure to broad municipal bonds without a set maturity, MUB is a direct substitute, and for low-cost tax-exempt bonds, products such as VTEB are also worth comparing. Investors who want actively managed municipal bonds can also consider products such as JMUB. The three products shown in the table, MUB, VTEB and JMUB, all invest in municipal bonds without a set maturity and therefore lack a fixed-maturity structure, which is the difference; for this ETF, the fixed 2030 maturity structure is the point of differentiation.

Here are the points to review before investing in IBMS. The fixed maturity and tax-exempt interest are attractive, but interest-rate risk, credit risk, and reliance on tax treatment need to be checked in advance. It is also a good idea to compare it with general municipal bond products that have no set maturity.

Price declines from rising rates before maturity and credit deterioration among issuing municipalities are the main variables for short-term performance, and because the tax exemption is based on the US tax system, it applies differently to investors outside the US. If you do not hold until maturity, you may incur losses from interest-rate changes.

It is a suitable candidate for US taxable investors who want to invest in municipal bonds with a set maturity date and collect tax-exempt interest until maturity. If you want municipal bonds without a set maturity, compare products such as MUB and VTEB; if you want fixed-maturity municipal bonds, compare this product alongside them before choosing.