The instructions for Form 3922 provide that there will be a value in Box 8 on Form 3922 if the exercise price was not fixed or determinable on the date the option was granted.
For purposes of determining your gain or loss, the amounts that need to be entered into TurboTax are those amounts in boxes 1 through 6. The information in boxes 1 through 6 represents what actually took place with regard to your ESPP shares. In other words, you are entering your transaction information. The value in box 8 represents the exercise price per share price as if the the option was exercised on the date the option was granted. TurboTax does not ask for box 8 information because it has no relevance regarding your gain/loss on these transactions.
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