Yes, you will use zero as the sales price since that is shown on the Form 1099-B is zero. However, in your description you noted ordinary income:
- 'the 1099 supplemental has: (type RSU), (quantity), (date acquired), (date disposed), (proceeds 0), (ordinary income reported $XXX), (adjust cost basis XXX), (adjust gain/loss -XXX)'
You do have a cost basis for the amount that was recorded as ordinary income, which would have been reported in your W-2 wages at some point. This means you do have a cost basis for the dollars you did pay tax on even though you didn't pay additional funds out of your pocket. This also shows that you have a loss on the transaction.
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