" I DIDN'T sell any of my RSU's"
The moment the RSUs vest YOU own ALL the stock in the grant so only "you" can sell the stock. If you look at the original documents you received and probably signed when the RSUs were granted you might have allowed the company to sell some of the stock "for taxes", but you owned the stock that was sold and got a 1099-B, (I assume).
Your problem is that you are using the WRONG BASIS when you enter the sale. The broker is only obligated to provide the "out of pocket" cost of the stock you acquired and that's typically $0 for RSUs, but that's not the correct basis. The correct basis, per share is: (Compensation reported on the W-2 for the vesting)/(GROSS number of shares in the grant). That's the basis to use. For a "same day" sale the typical result is a small loss due to selling commissions and fees.
Enter the 1099-B as it reads. Then click the blue "I'll enter additional info" button and on the new page that comes up enter the correct basis.
Tom Young
