I would advise that you report this amount as Other Reportable income and describe it as Deposit forfeited by buyer.
In TurboTax, open your return and follow these steps:
- Click on Federal in the left-hand column, then on Wages and Income
- Continue and locate the Less Common Income section
- Click Show more and click Start next to Miscellaneous Income at the bottom
- On the next page, click Start next to Other Reportable Income.