form 8949 instructions
• If this transaction is reported on a Part I (of form 1099-B) with box B checked at the top or if this transaction is reported on a Part II (of form 1099-B) with box E checked at the top, enter the correct basis in column (e), and enter -0- in column (g) and enter code B
• If this transaction is reported on a Part I (of form 1099-B) with box A checked at the top or if this transaction is reported on a Part II (of form 1099-B) with box D checked at the top, enter the basis shown on Form 1099-B in column (e), even though that basis is incorrect. Correct the error by entering an adjustment in column (g). and enter code B
code B covers all situations where the cost basis reported is incorrect. there is no code for "already reported on w-2".
the numbers from form 8949 will flow to schedule D, either the short term or long-term section, and that form will be included in your return. it's required in this situation.
