Qualifying vs. Disqualifying Disposition: The FICA Exception and the "Lesser Of" Rule

Part of Nauma's complete guide to The ISO AMT Tax Trap in 2026.

The basic distinction between a qualifying and a disqualifying disposition of incentive stock option shares is well covered elsewhere — see Incentive Stock Options (ISO) in Private Companies and Stock Options & Equity Compensation for the holding-period definitions themselves. This page picks up where those leave off, on two specific points that are frequently oversimplified: whether disqualifying disposition income is subject to payroll taxes, and exactly how much of the gain becomes ordinary income when the stock price has moved since exercise.

A Brief Recap of the Two Holding-Period Tests

A qualifying disposition requires holding the shares for more than two years from the grant date and more than one year from the exercise date. Meeting both tests means the entire gain is taxed as long-term capital gain. A disqualifying disposition is any sale that fails either test — selling too soon after exercise, too soon after grant, or both. A same-day-sale cashless exercise is automatically a disqualifying disposition, since neither holding period can possibly be satisfied. See Cashless Exercise vs. Exercise-and-Hold for how that specific case interacts with AMT exposure.

Point One: Disqualifying Disposition Income Is Ordinary Income — But It Is Not Subject to FICA

This is the detail most often stated incorrectly, in both directions. Get the two halves of it separately:

It is ordinary income for income tax purposes. The compensation element recognized on a disqualifying disposition is included in gross income, taxed at ordinary federal (and state) income tax rates, and reported by the employer on the employee's Form W-2, Box 1, as required under Treasury Regulation §1.6041-2.

It is not subject to FICA (Social Security and Medicare tax), FUTA, or federal income tax withholding. This is the counterintuitive part: despite being ordinary income, the IRS has, since 2002, administratively declined to assess FICA or FUTA tax or to require income tax withholding on statutory stock option income — both at exercise and at a subsequent disqualifying disposition. This began as IRS Notice 2002-47, announced as an indefinite moratorium (extending an earlier temporary one from Notice 2001-14), and it has never been rescinded in the more than two decades since. Treasury reaffirmed at the time that this exemption was intended to remain in place while the government considered — and ultimately did not pursue — a permanent rule requiring such withholding.

The practical result: a disqualifying disposition creates a real income tax bill (and shows up on the W-2), but no FICA is withheld or owed on that specific compensation element, and no federal income tax is withheld on it either — unlike the ordinary-income spread on an NSO exercise, which is subject to both FICA and standard withholding, because NSOs are not statutory stock options under this rule. This is one of the few tax advantages that survives even a disqualifying disposition of an ISO.

A note on sourcing: this section is based directly on the text of IRS Notice 2002-47, corroborated by the U.S. Treasury Department's own announcement of the moratorium, an IRS-published practitioner guide (Publication 5992), and the National Association of Stock Plan Professionals (NASPP). One secondary source encountered during research stated the opposite — that disqualifying disposition income is subject to FICA withholding — which directly contradicts the primary IRS notice and the other sources above; that claim does not appear to be correct and is not reflected here.

Point Two: How Much of the Gain Is Ordinary Income — the "Lesser Of" Rule

The common shorthand — "the spread at exercise becomes ordinary income, everything above that is capital gain" — is only correct if the stock price has risen or stayed flat between exercise and the disqualifying sale. If the price has fallen, a different rule applies, and getting this wrong overstates the ordinary income amount.

Under IRC §422, the ordinary income recognized on a disqualifying disposition is the lesser of two amounts:

1. The spread at exercise (fair market value at exercise minus the exercise price), or
2. The actual gain realized on the sale (sale price minus the exercise price).

Whichever of these two numbers is smaller is the ordinary income amount. Any additional gain above that (only possible under the first scenario below) is capital gain; if the sale price is below the exercise price, no ordinary income is recognized at all, and the result is a capital loss instead.

Three Scenarios, Same Grant

Assume 1,000 shares exercised at a $10 strike price, with a fair market value of $50 per share at exercise (a $40/share spread), later sold in a disqualifying disposition.

Scenario A — the stock price rises further, sold at $70/share. The lesser of the exercise-date spread ($40/share) or the actual sale gain ($60/share) is $40/share. Ordinary income = $40,000. The remaining $20/share ($20,000 total) is capital gain — long-term if the shares were held more than one year from exercise (even though the sale still fails the 2-year-from-grant test and is therefore still a disqualifying disposition), short-term if not.

Scenario B — the stock price falls partway, sold at $30/share. The lesser of the exercise-date spread ($40/share) or the actual sale gain ($20/share, i.e., $30 sale price minus $10 strike) is $20/share. Ordinary income = $20,000 — not $40,000. There is no additional capital gain or loss in this scenario, because the ordinary income recognized already accounts for the entire realized gain.

Scenario C — the stock price falls below the strike price, sold at $5/share. There is no gain over the strike price at all, so no ordinary income is recognized. Instead, the result is a capital loss of $5,000 (the $5/share sale price minus the $10/share strike price), which is a short-term capital loss in this case since the position was held one year or less.

These figures are illustrative examples only and do not reflect any specific taxpayer's actual grant, exercise, or transaction.

Scenario B is the one most often gotten wrong: without the "lesser of" rule, someone might assume the full $40/share exercise-date spread is always ordinary income, overstating the tax bill by $20,000 in this example and potentially leading to an incorrect W-2 reconciliation or an inflated estimate of taxes owed.

Employer Reporting Requirements

Employers must report each ISO exercise to the employee and the IRS on Form 3921, regardless of whether the shares are later held or immediately sold. If a disqualifying disposition occurs, the resulting ordinary income is reported on Form W-2, Box 1, and the employer generally receives a corresponding compensation deduction — something that does not happen for a qualifying disposition, where the employer gets no deduction at all. Employees should expect their W-2 to reflect the disqualifying disposition income if one occurred during the year, and should reconcile that figure against their own calculation using the "lesser of" rule above, rather than assuming the full exercise-date spread was used.

What This Page Does Not Cover

This page assumes familiarity with the basic definitions of qualifying and disqualifying dispositions — see Incentive Stock Options (ISO) in Private Companies and Stock Options & Equity Compensation for those. It does not cover the AMT preference item calculation for shares held past year-end — see What Is the Alternative Minimum Tax (AMT)? — or the mechanics of cost basis tracking after a disqualifying disposition, covered in Cost Basis.

California Note

California mirrors the federal treatment regarding withholding: income from a disqualifying disposition of an ISO is exempt from California Personal Income Tax (PIT) withholding at the time of the sale. However, California's Employment Development Department (EDD) does require employers to report this income as "PIT wages" on their quarterly tax filings (Form DE 9C) — so the income is reported to the state even though no withholding is taken at the point of the disqualifying disposition. California does not administer Social Security or Medicare taxes (those are exclusively federal), so the FICA/FUTA exemption under IRS Notice 2002-47 is a separate, federal-only question. Additionally, California taxes the resulting ordinary income and any capital gain at California's regular rates (up to 13.3%), with no preferential rate for the capital gain portion the way federal tax provides — see Capital Gains Taxes for California's treatment of investment income generally.

This article is for educational purposes only and does not constitute investment, tax, or financial advice. ISO disposition rules are technical and fact-specific, and errors in calculating ordinary income versus capital gain can result in significant under- or over-payment of tax. Always consult a qualified tax advisor and verify current IRS guidance before relying on any specific calculation, and reconcile your own figures against your employer-issued Form 3921 and W-2.