At-a-Glance: Form SS-8
Fax numbers and IRS rules change often — always verify on irs.gov before sending. General information only, not tax advice.
What is the Form SS-8 fax number?
Fax the completed and signed IRS Form SS-8, with attachments, to 855-242-4481. This number reaches the IRS Form SS-8 Determinations unit in Holtsville, NY and applies to all filers.
Important: do not submit Form SS-8 with your tax return — that will delay the processing time. File it separately.
Always verify the current number on the latest Form SS-8 instructions at irs.gov before sending.
What Is Form SS-8?
Form SS-8, officially titled "Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding," is the IRS document used to request an official determination of whether a worker is an employee or an independent contractor. Either a business (firm) or a worker can file it to settle questions about employment-tax responsibilities and income-tax withholding.
Why You Might Need Form SS-8
Workers and businesses file Form SS-8 when worker classification is unclear or disputed. Common scenarios include:
- •You received a 1099-NEC but believe you should have been treated as an employee
- •A business is unsure whether to treat a worker as a W-2 employee or a contractor
- •You need an official IRS ruling for employment-tax or withholding purposes
- •Worker classification affects benefits, taxes, or a dispute with the payer
Where to Fax Form SS-8 in 2026
Form SS-8 has a single nationwide fax number for all filers, routed to the Form SS-8 Determinations unit. Fax the completed and signed form together with all attachments.
Official IRS Fax Number — Form SS-8
Do not submit Form SS-8 with your tax return — that will delay processing. File it separately.
Note: IRS fax numbers change and can be routed by state — always verify on the official form instructions before sending. Not affiliated with the IRS. Not tax advice. Last verified: June 26, 2026.
Mail Alternative
Prefer to mail it? You can send Form SS-8 to the Determinations unit in Holtsville, NY:
Form SS-8 Determinations
P.O. Box 630, Stop 631
Holtsville, NY 11742-0630
| Detail | Form SS-8 |
|---|---|
| Fax number (all filers) | 855-242-4481 |
| Form purpose | Determination of worker status — employee vs. independent contractor |
| Mailing address | Internal Revenue Service, Form SS-8 Determinations, P.O. Box 630, Stop 631, Holtsville, NY 11742-0630 |
| Do not | Submit with your tax return (it delays processing) |
| Last verified | June 26, 2026 |
Fax Form SS-8 now with FaxFlow — from your phone or computer, no fax machine needed.
Fax Form SS-8 nowStep-by-Step: How to Fill Out & Fax Form SS-8
Download Form SS-8
Get the latest version from IRS.gov. Type directly on the PDF or print and fill it in.
Answer All Sections
Complete the questions about behavioral control, financial control, and the relationship between the worker and the firm as fully as you can.
Sign and Attach Documents
Sign and date the form, then attach supporting documents such as contracts, 1099s, or W-2s that help explain the working relationship.
File Separately From Your Return
Do not include Form SS-8 with your tax return — submitting it that way delays processing. Send it on its own.
Fax to 855-242-4481
Send via FaxFlow for instant delivery confirmation, and keep the receipt as proof. You can also mail it to the Form SS-8 Determinations unit in Holtsville, NY.
Using FaxFlow to Send Form SS-8 Easily
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Start faxing nowFrequently Asked Questions
What is the fax number for Form SS-8?
Fax Form SS-8 to 855-242-4481 (Form SS-8 Determinations, Holtsville NY). This number applies to all filers. Always verify the current number on the latest Form SS-8 instructions at irs.gov before sending.
Should I attach Form SS-8 to my tax return?
No. Do not submit Form SS-8 with your tax return, as that will delay the processing time. File Form SS-8 separately by fax to 855-242-4481 or by mail to the Form SS-8 Determinations unit in Holtsville, NY.
Can I fax Form SS-8 online?
Yes. With FaxFlow you can fax Form SS-8 online from your phone or computer with no fax machine needed. Upload the completed and signed form with attachments, enter 855-242-4481, and send to get a delivery confirmation.
Can I mail Form SS-8 instead of faxing it?
Yes. You can mail Form SS-8 to: Internal Revenue Service, Form SS-8 Determinations, P.O. Box 630, Stop 631, Holtsville, NY 11742-0630. Faxing to 855-242-4481 is typically faster and gives you a delivery confirmation.
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