ISO Exercise History: AMT Verification and Holding Period Compliance

If you have exercised incentive stock options, you may owe Alternative Minimum Tax even if you haven't sold the shares. Verify whether you triggered AMT, understand the disqualifying disposition rules, and track your holding periods to avoid losing long-term capital gains treatment.

Check if you triggered AMT. When you exercise ISOs and hold the shares (rather than selling immediately), the spread between your exercise price and the fair market value at exercise is an AMT preference item. If this spread was large enough, you may owe Alternative Minimum Tax for the year of exercise. Your CPA should run or re-run your AMT calculation for that tax year.

If you are still holding shares, monitor the disqualifying disposition rules. To get long-term capital gains treatment on ISOs, you must hold the shares for at least two years from the grant date and one year from the exercise date. Selling before either deadline is a "disqualifying disposition," which converts the bargain element to ordinary income.

If you sold in the same year you exercised, it is likely a disqualifying disposition. The one-year holding requirement from exercise date means same-year sales almost always fail the holding period test. The spread at exercise becomes ordinary income reported on your W-2, and any additional gain is short-term capital gain.

The pitfall: Many people exercise ISOs without realizing they triggered AMT, then discover an unexpected five-figure tax bill the following April. If you exercised ISOs in the current or prior year, a CPA should verify your AMT position before filing.