My broker Fidelity automatically sold some of my RSU on the day of vesting in 2022 to cover taxes. I did not make any other stock transaction in the year. I received a 1099-B from Fidelity for the RSU sale which has a "cost basis" of $0 and proceed of $4000. Then I also received another 1099 supplemental form for the same RSU sale which has an "adjusted cost basis" of $3999.
It seems like using $0 cost basis will count the entire $4000 proceed as a short term capital gain. However, using the $3999 adjusted cost basis will count the sale as a $1 short term capital loss.
When I report the RSU sale with TurboTax, do I use the $0 cost basis or the $3999 adjusted cost basis?
