How can I adjust 1099-B using TurboTax?

[taxfiler25]

Hi, I sold stock options on Fidelity. The taxes have been withdrawn right away. My income/gain from that sale is now in my W-2. That means I paid taxes for that income. Fidelity sent me the form 1099-B with exactly the same gain as in my W-2. But 1099-B doesn't mention any taxes which I paid (0.00 for Federal and State). That's why I need to pay the taxes again.

I found the thread on this forum which is very similar to my case: https://ttlc.intuit.com/community/taxes/discussion/1099-b-doesn-t-show-withholdings/00/2505900

But it's not clear what I should do in the TurboTax to avoid a double taxation. What does it mean 'adjust the cost basis'? Is it allowed to change the data in the 1099-B form? Fidelity sent to IRS one data and I'll send completely different data.

Thanks in advance!

[taxfiler25]

Using the example from that thread, let's say I sold stock options for $10,000. I paid for the stock $7,500. So, my taxable gain/income is $2,500.

In my W2 I have $2,500 in the box 12b/V

In 1099-B I have:

1d Proceeds: $10,000

1e Cost or Other Basis (b): $7,500

Gain/Loss: $2,500

4 Federal Income Tax Withheld: 0.00

16 State Tax Withheld: 0.00

Because the form 1099-B doesn't mention tax withheld (it's mentioned in W-2) I need to pay tax for the income ($2,500).

How can I adjust 1099-B in TurboTax to avoid double taxation?

Thank you!

[ThomasM125]

You do need to adjust the cost basis on the Form 1099-B to reflect the income reported on your W-2 form. If the additional income reported in box 1 on your W-2 form is all from the sale of the stock reported on the Form 1099, then you can add that income to the cost basis on the 1099-B form if it isn't already listed there. You will see an option that says The cost basis is incorrect or missing on my 1099-B when you enter the stock sale information reported on your 1099-B form:

Choose that option and on another screen you will see where you can enter the correct cost basis:

This is a common entry so it won't attract negative attention from the IRS.