It's not clear what you mean by double taxation. The 1099B generally does not report the correct cost basis for RSUs because they do not account for the vested date value included in your wages for each appropriate year. When a sale occurs then the cost basis generally needs adjusted to account for the correct cost basis fair market value (FMV) included in the wages at the vesting date. This cost basis calculation must be tracked for each block of shares on each vesting date.
Sales always use the first in-first out method unless you specifically state which shares you want to sell.
As long as you know you have entered the accurate cost basis for the stock sale, that's what counts, and your gain or loss will be accurately reflected in your taxable income.
Please update here if you need further assistance and one of our tax experts will help.
@DSSS1234
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