Get your taxes done using TurboTax
You can report the sale in the Investment Income section or the Less Common Income section (see screenshots below).
If you report the sale in the Investment Income section, be sure to indicate that you did not receive a 1099-B.
If you report the sale in the Less Common Income section, be sure to follow the prompts closely so you do not wind up excluding any gain since this is a second home and not your principal residence.
