as basis per Turbota include
1. Original cost, including sales tax, purchase expenses, etc.
PLUS
2. Improvements (with a useful life of more than one year)
3. Nondeductible assessments for improvements (sidewalks, utilities,
etc.)
4. Any selling expenses
MINUS
5. Casualty and theft losses
In the amount box for the basis, you can right-click on it and then click on add supporting detail. This allows Turbotax to do the addition.