What typically happens with employee stock options is ordinary income is reported on your W-2 to account for the discount you received when you paid less for the stock than it was being traded for. Then, you get a form 1099-B that lists the sale proceeds and the cost basis equal to what you paid for the stock.
Since what you paid for the stock was less than the market value, and the difference is reported on your W-2 form, the cost listed on the form 1099-B is understated. So, you have to change the cost basis reported on the 1099-B form when you report it in TurboTax.
When you enter the form 1099-B in TurboTax, you should enter the sales and cost basis as listed on the form, then you will see underneath the entry boxes I need to enter amounts form box 1f, box 1g, or other adjustments. You can enter an addition to your cost basis equal to the income reported on your W-2 form to lower the gain on sale accordingly and use Code B for the adjustment code.
If you sold your shares as soon as you acquired them, then the capital gain will probably be minimal.
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