Section 422 makes ISO tax treatment conditional, not automatic

The record

Internal Revenue Code Section 422, as published by Cornell's Legal Information Institute, defines the conditions an option must meet before its exercise can qualify for the tax treatment reserved for an 'incentive stock option,' or ISO. The statute requires that the option be granted under a plan approved by shareholders within 12 months before or after the plan's adoption, that the option be granted within ten years of adoption, that its term not exceed ten years, that its price equal fair market value at grant, that it be non-transferable other than by will, and that the holder not own more than ten percent of voting stock unless price and term are adjusted. Section 422(d) adds a further ceiling: to the extent the aggregate fair market value of stock underlying ISOs first exercisable for an individual in a calendar year exceeds $100,000, the excess is treated as options that are not ISOs. An option that does not meet these conditions, or that a company does not designate as an ISO, is a nonqualified stock option, or NSO, taxed under different rules.

What the documents establish

The IRS's own Topic 427 states a statutory option generally produces no income at grant or exercise, though the alternative minimum tax can apply in the exercise year, while gain on a later sale is capital gain only if the holder meets the statute's holding-period requirement: no disposition within two years of grant and one year of exercise, under Section 422(a)(1). An NSO is taxed differently: lacking a readily determinable fair market value at grant, which Topic 427 says describes most NSOs, there is no taxable event until exercise, when the spread becomes ordinary income. Neither document states a specific tax rate as universal; both describe outcomes depending on the holder's actual holding period and disposition.

The operating read

Editorially, the qualifying conditions read as a checklist an option plan and grant agreement must satisfy at issuance, not a status added later by relabeling an award. A grant that misses the shareholder-approval window, prices below fair market value, or exceeds the $100,000 first-exercisable ceiling in a given year produces NSO treatment for the excess or the whole grant, regardless of what the agreement calls it. An employee who receives Form 3921 after exercising a statutory option, as Topic 427 describes, is being told the company treated the grant as an ISO; that form does not itself guarantee the holding period will be met on a later sale.

What to check before you decide

Before assuming an option carries ISO treatment, check the following against the plan document and grant notice.

• Was the plan approved by shareholders within the statute's 12-month window, and does the grant fall within the plan's ten-year window?
• Does the aggregate fair market value of options first exercisable this year, across the employer group's plans, exceed the $100,000 ceiling?
• Will the holder meet both the two-year-from-grant and one-year-from-exercise holding periods before any planned sale?

This is not tax advice; the holding-period and valuation questions above depend on facts a tax adviser should confirm against the plan and grant documents.