Final answer:
A bond investor usually engages in a tax swap by selling a bond with a capital loss and replacing it with a similar security to offset capital gains for tax purposes.
Step-by-step explanation:
In a tax swap, a bond investor typically sells an issue that has incurred a capital loss and replaces it with a comparable security. This strategy allows the investor to realize a capital loss, which can be used to offset capital gains from other investments, thereby reducing the investor's overall tax burden. The investor then replaces the original bond with a similar one to maintain a comparable position in the market.