Municipal Bond Interest Can Trigger Higher Taxation of Social Security Benefits
An investor purchased a municipal bond offering an 8% tax-exempt yield, expecting to avoid federal taxes on the interest. However, this income increased his adjusted gross income (AGI), which is used in calculating how much of his Social Security benefits become taxable. The IRS includes tax-free municipal bond interest when determining if retirees cross thresholds that make portions of their Social Security payments subject to taxation. For single filers with AGIs above $34,000 and married couples filing jointly over $44,000, up to 85% of Social Security benefits can be taxed. These thresholds have not changed in decades, meaning even small increases in income—like from a high-yield municipal bond—can push retirees into higher tax brackets for their retirement benefits. While the interest remains federally tax-free, it indirectly results in more taxable Social Security payments—a phenomenon sometimes referred to as a 'tax torpedo.' Additionally, this increased AGI could also lead to higher Medicare premiums based on income-related adjustments.
Topics: municipal bonds retirement planning Social Security taxation tax-free income