@melissa_eckmann - depends which transaction you are asking about requiring the need to report:
there are two separate transactions occuring
1) your RSU's vest and you are given the shares outright. You owe ordinary income tax on that transaction. The estimated taxes are withheld and appear in your W-2. Your cost basis on those shares are established based on the market value at the time they vest (this is important!). This transaction does NOT have to be further reported. The income should already be part of your W-2 as additional wages.
2) you decide to sell the shares that you own outright. That can occur on the same day they vest or months or years later. Whatever you sell the shares for LESS the cost basis determined in #1 is the capital gain or capital loss that has to be reported. This would be reported on Form 1099-B by the brokerage firm and put in Schedule D of the tax return.
which transaction were you asking about?
