If I exercise ISOs and hold the stock (triggering AMT for the spread) or sell the stock in a disqualifying disposition, will I need to make estimated tax payments?

You need to pay enough tax during the year through withholding or estimated tax payments to avoid penalties and interest. The tax that has to be paid includes any AMT attributable to the exercise of ISOs or any ordinary income from a disqualifying disposition. In these ISO situations, your employer does not...

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