To enter personal property (or inherited property that is considered personal property) on Schedule D:

When you are going through the Q&A for Form 1099-B, on the screen titled Investment Sales - Adjustment Codes, you should select Code L - Other Non-Deductible Loss (including personal loss). When this code is selected, the gain/loss column on the Schedule D will be zero instead of a negative number (as is appropriate since losses on personal property are not deductible). On the following screen, the loss adjustment amount will need to be entered or verified.

To reach that screen in your TaxACT return:

1. From within your TaxACT return (Online or Desktop), click on the Federal Q&A tab
2. Click Investment Income to expand the category and then click Gain or loss on sale of investments
3. Click Capital gain or loss (Form 1099-B)
4. Click Add to create a new copy of the form or click Review to review a form already created 
5. Continue to the screen titled Investment Sales - Adjustment Codes

Note that if the inherited property is not considered to be personal use property then you would not select Adjustment Code L. This will ensure the loss would still carry to the Form 1040.