Here is a video to help What are restricted stock units (RSUs) and how do I report them?
When the RSU vested, the fair market value was added to your w2 and was your immediate basis in the stock. Your employer may or may not have reported it (either correctly or at all) to the broker for a correct basis on the form. Click this link for more info on RSU Cost Basis.
The IRS puts this in the employee's hands to track their own basis. I want to urge you to create a financial notebook that is kept separate from your tax return. Keep it safe and each year, add your year-end statements from all your financial accounts plus a copy of your W2’s. This will protect you down the road as proof of your basis in your various investments. As you go through life, rollovers, RSU basis and sales, and more will be captured for you.
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