Final answer:
After considering federal and state taxes, Dana should invest in the corporate bond, which provides a higher after-tax yield than the Treasury bond.
Step-by-step explanation:
To determine whether Dana should invest in a Treasury bond or a corporate bond, we must consider the after-tax yield of each investment. The Treasury bond yields 5% before tax, while the corporate bond yields 6%. However, Dana’s federal marginal rate is 24%, and her marginal state rate is 5%. Treasury bond interest is exempt from state taxes, but corporate bond interest is not.
Calculating after-tax yield for the Treasury bond: $80,000 x 5% = $4,000 (before federal tax). After federal tax: $4,000 - ($4,000 x 24%) = $3,040.
For the corporate bond, since state tax applies: $80,000 x 6% = $4,800 (before tax). After federal and state tax: $4,800 - ($4,800 x (24% + 5%)) = $3,192.
Despite a higher pre-tax yield, the after-tax yield of the corporate bond is higher. Therefore, Dana should choose the corporate bond for a better return on investment after considering taxes.