Generally the amount reported on your W-2 as income is the discount amount you received on the FMV stock price. This is reported in the year you exercise your stock option.
If you sold the stock in the same year, you may receive a 1099-B from the broker to report the gain/loss on the sale of the discounted stock, which is usually taxed at a lower capital gains rate. Type '1099b' in the Search window, and 'Jump to 1099-B' for the entry area.
If you haven't sold the stock yet, you don't need to report the option exercise anywhere else. Tax consequences are a combination of grant date, exercise date, sale date.
Here's more detailed info to help you:
https://turbotax.intuit.com/tax-tips/investments-and-taxes/incentive-stock-options/L4azWgfwy
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