To enter your corrected cost basis, follow these steps. In the investment section for 1099-B:
- Select to enter your information by transaction.
- On the next screen, you'll enter boxes 1a-1e.
- Directly below these boxes, click the blue button to enter additional Info about this sale, "I'll enter additional info on my own."
- On the next screen, you'll have the option to enter corrected cost basis which is where you can enter your correct amount.
