Bruce Brumberg
Incentive stock option (ISO) exercises made during a calendar year are reported to you and the IRS on Form 3921 early in the following year. This article explains what you need to know about the information on the form, and how the form can help you better understand the complexities of ISO taxation.
Marilyn Renninger
Here's some advice for financial fitness: take stock of taxes before you exercise! When and how you exercise your stock options can have a major impact on how much tax and which taxes you'll pay.
Marilyn Renninger
Learn how and when income from ISOs is subject to taxes, including the alternative minimum tax. You must consider taxes at both exercise and sale to put together an optimal strategy.
IRS and US Treasury Department
This updated and clarified the regulations on ISOs. The regulations are of greater concern to corporations than to individual optionholders and advisors (e.g. no changes to the basic tax structure or AMT treatment). For ISO planning, the rules clarify certain advanced topics, such as the wash sale rule, stock swaps, and transfers to trusts and in divorce, and they confirm current interpretations and practices.
IRS
US Treasury Department
The proposed regulations on ISOs, which are very similar to the final rules, contain a more detailed background and discussion of the provisions than the final version does. The similar section in the
final regulations focuses on revisions and clarifications of the proposed rules.
Internal Revenue Service
This IRS publication explains the tax treatment of many kinds of income, including that from NQSOs, ISOs, and restricted stock/RSUs.
Return to top of this page
The taxation of incentive stock options (ISOs) is complex. The tax impact depends on when you sell or transfer the stock received at exercise. If you make what is called a disqualifying disposition (e.g., an early sale or a gift) of ISO shares, ordinary compensation income and any capital gains/losses will be determined by your...
For an ISO exercise in which you hold the stock, nothing is...
Not directly. However, the American Taxpayer Relief Act (ATRA) has three provisions on the alternative minimum tax (AMT) calculation that are important for high-income taxpayers...
First: Remember that the sale of ISO stock will raise AMT implications (alternative minimum tax).
Second: The matter depends on how long you hold the stock...
"Disqualifying disposition" is the legal term for selling, transferring, or exchanging ISO shares before satisfying the ISO holding-period requirements: two years from date of grant and one year from date of exercise. If you sell, transfer, gift, or short the stock too soon, you lose...
While you lose the opportunity to have the lower long-term capital gains rate apply to the difference between the exercise and sale price, the alternative minimum tax (AMT) no longer applies. You do have compensation income and perhaps short-term capital gains equal to...
Unlike with NQSOs, there is no federal income tax withholding at...
Fortunately, the American Jobs Creation Act of 2004 specifically...
Your company is required to file Form 3921 with the IRS and either give you a copy or present the same information on a substitute document. With this reporting, the IRS now knows more information about your ISO exercises than it did before, particularly with regard to...
To have beneficial tax-qualified status, grants of ISOs must have certain characteristics and must follow...
No. What this means is that you will not have the favorable tax treatment that you get with ISOs when you hold the stock one year from exercise and two years from grant...
Yes. Unlike with NQSOs, federal tax laws currently provide that Social Security taxes are not owed upon exercise of ISOs, regardless of whether you soon sell the stock...
The Internal Revenue Code is very clear on the requirements of favorable tax treatment for ISOs. Among other conditions...
Capital gain is income that arises from the sale of a capital asset. Gain from the sale of securities held for investment, such as shares acquired from stock compensation...
The holding period to determine whether a capital gain is long-term or short-term starts on the...
The treatment for tax-loss harvesting is similar to that of owning and selling any two stocks. The income-tax reporting for multiple transactions is...
Return to top of page
Tax errors can be costly! Don't draw unwanted attention from the IRS. Our Tax Center explains and illustrates the tax rules for sales of company stock, W-2s, withholding, estimated taxes, AMT, and more.
Test your knowledge with our Stock Options quiz.
Listen to our new podcast on the basics of stock options.
IRS Form 3921 For Incentive Stock Options: What You Need To Know, And How It Can Help You Understand ISO Taxation 
