IRS Form 3921 (Tax Year 2026)
Exercise of an Incentive Stock Option Under Section 422(b)
- No TCC. No ID.me.
No IRS Setup Required
- Secure. Compliant.
IRS A2A-Approved
- Fast, Accurate,
and Hassle-Free
IRS Form 3921 is used to report the transfer of stock acquired through the exercise of an Incentive Stock Option (ISO). Employers must provide the form to employees and file it with the IRS.
Form 3921 Filing Pricing
Starting at
$249
- per IRIS Transmission
- + $0.28 per recipient
- One transmission covers one form type
- Unlimited payers may be included in one file
- Combined Federal/State filing included, if applicable
- Printing and mailing available for an additional fee
High-Volume or Multiple Filings
Need to file large volumes or multiple submissions?
Contact us for a custom quote.
Secure IRIS A2A Filing
- We submit directly through our IRS A2A-approved channel
- No TCC, ID.me, or IRS setup required for you
- We validate your data to help reduce errors and rejections
- SOC 2 compliant portal built for secure data handling
- TIN matching available upon request; additional fees may apply
Need a quote for Form 3921?
Call (480) 706-6474 or email info@1099fire.com
- 20+ Years Experience
- IRS A2A Approved
- Real U.S. Support
HOW OUR IRIS FILING PROCESS WORKS
Upload Your File
Upload your Excel or CSV file securely.
We Validate & Format
We format and validate your data to IRS standards.
Review & Approve
We generate IRS-ready PDFs for your approval.
Filed Directly to IRS
Your forms are e-filed securely using IRIS.
No manual processing. Fully automated IRIS submission.
Frequently Asked Questions (FAQs)
How does your Form 3921 filing service work?Simply upload your Excel or CSV file through our secure portal. We review and validate the data, generate the IRS XML and Copy B forms in PDF. Once the PDFs are approved, we electronically file the returns through the IRS IRIS A2A system on your behalf.
No. You do not need your own TCC, ID.me account, or IRIS configuration. We transmit filings using our established IRS IRIS A2A connection.
Yes. We support original filings, corrected returns, and prior-year Form 3921 submissions through the IRS IRIS system.
Yes. We can handle high-volume Form 3921 filings for companies with many ISO exercises. You send us your data file, and we help validate, format, generate PDFs, and electronically file the returns.
1099FIRE previously sold 3921 software for the IRS FIRE System, where users could generate a file and upload it through the IRS website. IRIS is different. For 3921 filing, there is no simple IRS upload screen where users can browse for a file and submit it themselves. IRIS transmissions must be sent through a secure A2A channel.
Because the A2A connection cannot be packaged as normal downloadable software, we now provide a 3921 e-filing service instead. Send us your Excel file, and we handle the data import, validation, recipient PDFs, XML creation, and IRS IRIS transmission on your behalf.
Corporations generally file Form 3921 when stock is transferred to an employee or other person after the exercise of an incentive stock option under Section 422(b). The form reports details such as the grant date, exercise date, fair market value, exercise price, and number of shares transferred.
If your company had ISO exercises during the tax year, we can help review your data and prepare the Form 3921 filing.
Recipient copies are generally due by January 31, and electronic filing with the IRS is generally due by March 31.
