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Usually, these types of stock transactions are reported on a 1099-B. However, if the company will not correct it, you could enter your 1099-MISC and then enter a separate line in Other Income with a negative reflecting the cost basis of the stock. The net of these two numbers will be the amount you are taxed on.

First, follow the instructions below to add your 1099-MISC:

1. Open or continue your return, if you're not already in it.
2. Search for 1099-misc and select the Jump-to link.
3. Click on Add a 1099-MISC. 
4. Enter the amounts as shown on your form. 
5. Describe the reason for this 1099-MISC.
6. Answer None of these apply on the screen Does one of these uncommon situations apply?
7. Answer No, it didn't involve work like my main job for the question Did this involve work that's like my main job?
8. Answer You got it in 2020 for the question How often did you get this income?
9. Answer No, it didn't involve an intent to earn money for the question Did this involve an intent to earn money?
10. Answer the remaining on-screen questions.
11. Your 1099-MISC will flow to Other Income.

Then, deduct the cost basis in Other Income:

1. Click on Federal on the left hand side.
2. Scroll down to Less Common Income.
3. Click Start next to Miscellaneous Income.
4. Click Start next to Other reportable income.
5. Answer Yes to Any Other Taxable Income?
6. List description as "Basis of stock sale proceeds incorrectly reported on 1099-MISC"
7. Enter the amount with a negative.

Next, preview your 1040 to ensure both the 1099-MISC and the negative stock basis are both reported in Part I, Line 8.

1. Click on Tax Tools. 
2. Click on Tools.
3. Click on View Tax Summary under Other helpful links.
4. Click on Preview my 1040.
5. Once open, use Control + F, and search Schedule 1 and look for Line 8.