You definitely need to report the transactions on the 1099-B. "Noncovered Security" means the cost basis was not reported to the IRS. The reason the cost basis is not reported to the IRS is because it is probably wrong, if there is one on your 1099-B. RSUs are really pretty simple. When they vest, the value on the date of vesting becomes ordinary income. This ordinary income should be included in Box 1of your W-2. Because you are taxed on that amount, that is also your cost basis. When you enter your RSU transaction you should enter the value that was included in Box 1 of your W-2. If you did not sell all of your shares/units upon vesting you will have to do a little math and determine the cost per share. If your employer did not include the value of the RSUs in box 1 of your W-2, you will have to add it t your tax return as additional compensation income.
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