The restricted stock units (RSU's) are taxable income and as such the value of them is included in your salary wages (box 1), social security wages (box 3) and Medicare wages (box 5) on your W-2 form. Since you have to pay social security and Medicare taxes on the income, and also income taxes, some of the shares are sold by the company to pay those taxes. They are paid in by the company.
You need to report the sale of those shares to report any resulting gain or loss, but the gain or loss is minimal since you buy and sell them almost immediately. So, the gain on sale when your report the Form 1099-B in TurboTax should be minimal. Often, the Form 1099-B will report a minimal amount for the cost basis as you may have paid little or nothing to acquire the shares. However, the income reported on your W-2 form needs to be included in the cost basis of the shares sold, so you may need to adjust the cost basis reported on the Form 1099-B to compensate for that.
A simple way to determine the cost basis of your RSU shares sold is to divide the income for the RSU's as reported on your W-2 form, plus any additional money you may have spent to acquire them, by the number of shares acquired. That will give you the cost of the shares that you can then multiply by the number of shares sold to arrive at their cost basis.
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