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When you exercised stock options - there are two transactions - purchase and sale - and there are several reportings.The amount reported on the W2 form box 12 with the code "V"-Income from exercise of nonstatutory stock option(s) - is already included in box 1 as taxable wages. That amount is your basis in determination of capital gain or loss.The sale transaction is reported on form 8949 and transferred to schedule D part I because you did not hold shared more than a year.
On form 8849 - you will report purchase and sale on the same day.
The sale price you need to take from 1099B
The basis is coming from W2 form box 12 with the code "V"
Let me know if you need any clarification.