IRS Form 1099-B is issued by brokers to their clients no later than the middle of February. It shows how much you received from securities sales during the prior tax year, including proceeds from shares you acquired through stock compensation. You will use this amount (the net amount after any commissions or fees), along with your tax basis, to calculate your gain or loss for tax purposes on Form 8949 and Schedule D of your Form 1040 tax return. The information on Form 1099-B, which is also reported to the IRS, was recently expanded, particularly for sales of covered securities.
For details and updates on the rules relating to Form 1099-B, see the related FAQ and the instructions of the form. For the details of reporting stock sales on Form 8949 and Schedule D, see the section Reporting Company Stock Sales elsewhere on this website.