"Thanks. So I just received my 1099-B, but for some reason it only includes my RSU's sold as a gain/proceed (even though I sold same day)."
You need to understand how RSU's are reported on the 1099-B; the broker reports $0 basis even though that's wrong. (The IRS changed the reporting rule for RSUs just a few years ago allowing this incorrect reporting, and the cynical me feels it was done so that taxpayers that didn't understand that $0 was the wrong basis would over-report their income.) So you need to correct that incorrect reporting and ThomasM125 explains how to do that. On a per-share basis your basis for the stock sold is exactly the same as the per share "fair market value" figure your employer used to calculate the compensation in the first place.
Compensation = GROSS number of shares vested x per share "fair market value" at vest date.
