Disqualifying Disposition:

You sold the stock within two years after the offering date or one year or less from the exercise (purchase date). In this case, your employer will report the bargain element as compensation on your Form W-2, so you will have to pay taxes on that amount as ordinary income. The bargain element is the difference between the exercise price and the market price on the exercise date. Any additional profit is considered capital gain (short-term or long-term depending on how long you held the shares) and should be reported on Schedule D.

Qualifying Disposition:

You sold the stock at least two years after the offering (grant date) and at least one year after the exercise (purchase date). If so, a portion of the profit (the “bargain element”) is considered compensation income (taxed at regular rates) on your Form 1040. Any additional profit is considered long-term capital gain (which is be taxed at lower rates than compensation income) and should be reported on Schedule D, Capital Gains and Losses.
Situation 1: Disqualifying Disposition Resulting in Short-Term Capital Gain.

Yo traduciría el texto de la siguiente manera:

"Su obligación tributaria dependerá de si usted hace una declaracion calificativa o descalificativa de la enajenación de sus acciones de plan de compra".

I hope this information helps you!!