The cost basis on my 1099B differs from what is on the supplemental stock plan lot detail

[dylanschulz411]

The cost basis on my 1099B differs from what is on the supplemental stock plan lot detail for stock I sold from an employee stock plan.  My realized gain on my 1099b is $2480.08 but on my Supplemental, I have a realized loss of -$61.37 because on the Supplemental, my Adjusted cost/basis is higher.  How do I account for this?

[AmandaR1 · Accepted solution]

To enter your corrected cost basis, in the investment section for 1099-B: 

1. Select to enter your information by transaction. 
2. On the next screen, you'll enter boxes 1a-1e. 
3. Directly below these boxes, click the blue button to enter additional Info about this sale, "I'll enter additional info on my own."  
4. On the next screen, you'll have the option to enter corrected cost basis which is where you can enter your correct amount. 

Employee stock options get complicated and often your broker does not have information about your W-2 income when the options vest. I'd recommend being sure you understand how the cost basis is calculated so you know it's correct. 

[robmob]

Thank you for posting this activity.  I must be missing something because my situation is identical to the original person posting their question, but I can't seem to find the "enter additional information on my own" in the transaction area.  Do I need to delete the transaction and start over?

[DMarkM1]

1.  "Edit" the sale in the "Stock..." interview

2.  Review the descriptions and entries for boxes 1a-1e

3.  After box "1e" you will see an option about the "Cost basis being incorrect or missing" 

4.  "Select" that box

5.  The next page gives you three options.

6.  If you know the cost basis, select option 2 and enter the correct basis.

7.  The next page will show you the result.

[fanfare]

@dylanschulz411  the small loss of 61 is what you want to report on your Schedule D 8949.

[tom888]

My 1099B form indicate the cost basis is 0, but the correct cost basis in located in the supplementary section of the 1099B form.  The option to edit my RSU under "cost basis on my statement is incorrect" appears to be only available when I select "this is not employee stock" .  What is the correct way of entering in the cost basis?

[JohnW152]

What version of TurboTax are you using?

@tom888

[tom888]

It is 2021 Turbo Tax Premier Desktop version

[GeorgeM777]

Actually, continue to select this is stock acquired through an employee stock plan.  If you have to make an adjustment to cost basis, TurboTax instructions provide that your corrected basis is done on the screen asking about adjustments.  

The screen where you will enter your adjustment is Select any less common adjustments that apply and you will check the last box on that list.  Select Learn More to get a better understanding of whether you should enter a positive or negative amount.

@tom888