You should be able to get a statement showing your RSU activity. If they don't make them available online, check with your HR or Payroll Department. There is often a supplemental schedule included with your Form 1099-B that shows your correct cost basis for the units sold. If you have your earnings statement (or if they are available online) for the pay period that RSUs vested and were added to your income there is probably a separate line item on your statement showing the amount that was included in your income for that award.
How you handle the units that were withheld for tax depends upon whether they were sold or withheld. Restricted Stock Units (RSUs) are not actually shares of stock, rather, they represent shares of stock. When they vest, it is common for units to be "withheld" to pay the tax. This means the employee never actually receives the stock, so it doesn't need to be sold to pay the tax. If they are not reported as being sold, you don't have to account for the sale, because there wasn't one. You have to include those units in your calculations if you are using the total value of the award to determine a cost basis. If shares of stock were sold to pay the taxes, then the sale would be reported on your 1099-B.
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