Form 3921 (Rev April 2025)-2025

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  1. Click ‘Get Form’ to open it in the editor.
  2. Begin by entering the TRANSFEROR’S name, address, and TIN in the designated fields. Ensure accuracy as this information is crucial for IRS records.
  3. Fill in Box 1 with the date the option was granted and Box 2 with the date you exercised the option. These dates are essential for tax reporting.
  4. In Box 3, input the exercise price per share. This value reflects what you paid for each share of stock.
  5. Enter the fair market value per share on the exercise date in Box 4. This figure is important for calculating any potential gain or loss.
  6. Indicate the number of shares transferred in Box 5. This should match your transaction details.
  7. If applicable, provide information about any other corporation involved in Box 6, including their name, address, and TIN.

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You can get Form 3921 at the IRS Website(opens in a new tab) or by calling 1-800-TAX FORM (829-3676).
Form 3921 Form 3921 has details on your ISO exercise. This form is provided by your employer. Form 1099-B This IRS form has details about your stock sale and helps you calculate any capital gain/loss.
Form 3921 is an IRS form used to report the exercise of an incentive stock option (ISO) by an employee in the last tax year.
The main difference between the two forms is that Form 1099-B reports on the sale of stock, while Form 3921 reports on the exercise of an ISO. Form 1099-B is typically filed by the brokerage firm that sold the stock, while Form 3921 is typically filed by the startup that issued the ISO.
IRS Form 3922 is for informational purposes only and isnt entered into your return. Keep the form for your records because youll need the information when you sell, assign, or transfer the stock.

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Form 3921 Exercise of an Incentive Stock Option Under Section 422(b), is for informational purposes only and should be kept with your records. It does not need to be entered into your return unless you still hold the stock at year end (if you do, see the previous information regarding Alternative Minimum Tax (AMT)).
Corporations file this form for each transfer of stock to any person pursuant to that persons exercise of an incentive stock option described in section 422(b).

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