IRS Form 3921 is an information return used to report the exercise of an incentive stock option by an employee.
You can fill out our editable Form 3921 directly online. Once you’re done, download it to your device and submit it to the IRS.
Form 3921
2025
Official IRS form
Trusted by accountants
Form 3921
2025
Official IRS form
Trusted by accountants
IRS Form 3921 is an information return used to report the exercise of an incentive stock option by an employee.
You can fill out our editable Form 3921 directly online. Once you’re done, download it to your device and submit it to the IRS.
How to Fill Out Form 3921
- Open IRS Form 3921 in our PDF editor.
- Fill out Copies A, B, and C according to the Form 3921 instructions.
- File Copy A with the IRS.
- Furnish Copy B to the employee who exercised their incentive stock option.
- Keep Copy C for the corporation’s records.
What Is Form 3921 Used For?
Form 3921 is used to report the exercise of an incentive stock option (ISO) by an employee. Essentially, a corporation must file this information return for each employee who exercised their right to buy company stock at a predetermined price.
Employees should note that the spread between the exercise price and the fair market value at the time of exercise may be subject to the Alternative Minimum Tax (AMT), making Form 3921 data important for AMT calculations even if the stock is not immediately sold.
Who Should Use Form 3921?
Form 3921 is primarily used by corporations, as they are the ones who must furnish it to each eligible employee and file it with the IRS. However, employees also use it to figure their gains and losses on their tax returns in the year when they sell or otherwise dispose of the stock.
When Is Form 3921 Due?
Form 3921 is due to the employees by January 31st and to the IRS by February 28th or March 31st if filed electronically. If any of these dates fall on a weekend or a federal holiday, the deadline is pushed to the next working day.
What Happens If Form 3921 Is Not Submitted?
If Form 3921 isn’t submitted on time, you may face the following penalties:
- $60 per return if it’s up to 30 days late
- $130 per return if it’s more than 30 days late but filed by August 1st
- $340 per return if it’s filed after August 1st or not at all
- $680 per return for intentional disregard
In addition to this, you may be charged interest on penalties if they aren’t paid on time.
How and Where Do I File Form 3921?
You should file Form 3921 with the IRS using the addresses provided on the official website or the online Information Returns Intake System (IRIS). If you’re filing ten or more information returns in one tax year, you must do so electronically.
How to Get Your Form 3921
1
Open the fillable Form 3921
2
Complete it according to the instructions
3
Download Form 3921 to your device
#1. How do I get a blank Form 3921?
You can get a blank Form 3921 from pdf.net or from the official IRS website. Whichever you choose, open it in our PDF editor and fill it out online.
#2. Can I submit the Form 3921 electronically?
Yes, you can submit Form 3921 electronically and are required to do so if you’re filing ten or more forms. Even if you’re not, the IRS recommends that you use the IRIS platform for filing whenever you can.
#3. What if my Form 3921 is missing information?
If you’re an employee and your Form 3921 is missing information, you should immediately contact your employer and request a properly completed one. As for the employer, they should submit an updated version to the IRS by sending a new document with a “CORRECTED” box checked on the top.
To avoid these complications, use an official Form 3921 example when filling out your document.
#4. Can I fill out my Form 3921 online?
Yes, you can fill out your Form 3921 online by using our PDF editor and typing the required information directly into the empty fields.
#5. Is this form free?
This form is free to view and edit, but downloading requires a subscription plan. Check out the available options on our pricing page.
#6. Can I correct mistakes on Form 3921?
Only the employer can correct mistakes on Form 3921, as it is their responsibility to file it. If you are the employer, fill out a new document, mark it as “CORRECTED,” and submit it to the IRS and the employee to fix your error.
#7. How long does it take to process Form 3921?
There is no specific processing time for Form 3921, as it is an information return, and you don’t receive any feedback on it. These documents are simply kept on record for future reference.
#8. What is the difference between Form 3921 and Form 1099-B?
The difference between Form 3921 and Form 1099-B is that the former tracks when an employee buys the stock granted to them by an incentive stock option, while the latter tracks when they sell the stock.