Check the cost basis for your RSUs. If your RSUs were sold through a brokerage firm, or other firm that can handle sales of RSUs, many times those firms do not know your cost basis, and therefore, they will enter a zero as the cost basis. If you have a zero cost basis, that will result in a capital gain equal to the total proceeds and thus, you will be taxed on the total proceeds.
RSUs are a type of compensation. When they vested with you, your firm likely withheld and sold a certain number of shares to cover your tax withholding requirements. The value of the remaining shares was likely included on your W-2 because compensation of this type belongs on your W-2. For tax purposes, you only need to pay capital gains tax on any gain you have after selling the RSUs. If you have a loss, then you may be able to use that loss to offset other capital gains and possibly some of your ordinary income.
To review your cost basis for the RSUs, in TurboTax online, go to Income & Expenses, scroll down to Investment Income and revisit the category Stocks, Cryptocurrency, Mutual Funds, etc.
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