Yes, you will need to adjust your Cost Basis in your 1099-B for RSU sales. Typically, the 1099-B shows a $0 Cost Basis. You are correct that your taxable portion would be the difference in FMV after vesting/before sale.
Click this link for info on RSU Basis.
When you sell ESPP stock your basis for the sale is the sum of:
- Any amount you paid to receive the stock,
- Compensation income created either by the acquisition or sale of the stock (which should be reported on your W-2)
If the Adjusted Basis shown reflects the difference between the $57/$68 amounts, you could use that amount.
Click this link for more info on ESPP Stock Sale.
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