You should not have to enter anything if you have not sold your RSUs. To follow-up on the previous comments, the compensation income should not be less than what is reported on the W-2. The value of RSUs is typically recorded in Box 14 of the W-2, which is labeled "Other." There are no standard list of codes for Box 14, therefore employers are free to enter any description they like. It's possible that on your W-2, you may see the value in that box followed by "RSU."
For example, let's say you have $100,000 reported in Box 1 as wages and $10,000 reported in Box 14 labeled as RSUs. The $10,000 has already been included in the $100,000 amount, so you don't have to add the RSUs in Box 14 to your wages when you file your taxes.
Given that your employer sold some shares to cover your tax withholding obligations when the RSUs vested, what amount do you have in Box 14 on your W-2? If there is no amount in Box 14, that does not mean your employer did not include the value of the vested RSUs in your wages as reported on your W-2. It may be helpful at this point to confirm with your employer whether the value of the RSUs are already included in Box 1 on your W-2. Such value has probably already been included, but confirmation will remove any doubt.
@ajabon
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