W-9 vs I-9
These two get confused constantly, and it is understandable: both are one-page forms handed to you at the start of a working relationship. But they come from different agencies, answer different questions, and apply to different kinds of worker. Being handed the wrong one tells you something useful about how a company sees you.
| Form W-9 | Form I-9 | |
|---|---|---|
| Issued by | Internal Revenue Service | U.S. Citizenship and Immigration Services |
| Full title | Request for Taxpayer Identification Number and Certification | Employment Eligibility Verification |
| Question it answers | Whose taxpayer ID goes on the information return? | Is this person legally authorized to work in the United States? |
| Who completes it | A contractor, vendor, landlord or account holder | An employee, plus the employer |
| Applies to contractors? | Yes | No |
| Applies to employees? | No. Employees complete a Form W-4 | Yes, every one |
| Documents required | None. You supply a name and a number | Identity and work-authorization documents, inspected by the employer |
| Deadline | None fixed; before the payer files an information return | Section 1 by the first day of work; Section 2 within three business days of starting |
| Filed with the government? | Never | No, but retained and produced on inspection |
| Retention | Generally at least four years | Three years after hire, or one year after employment ends, whichever is later |
| Penalty exposure | $50 for a missing TIN, $500 for a false certification | Civil and criminal penalties for the employer, scaling with the violation |
An I-9 is about whether you may work. A W-9 is about where your income gets reported. Nothing on a W-9 touches immigration status, and nothing on an I-9 touches tax reporting.
Why the same person almost never needs both
The two forms sit on opposite sides of one distinction: employee or not. An employee completes an I-9 so the employer can verify work authorization, and a W-4 so the employer can withhold the right amount of tax. A contractor completes a W-9 and nothing else, because there is no employment relationship to verify and no payroll to withhold from.
So a request for both is a contradiction. It usually means one of three things. The company has a single onboarding packet and hands it to everyone without editing it, which is careless but harmless. Or somebody in HR is unclear on the distinction. Or the company genuinely intends to treat you as an employee and reached for a W-9 by mistake, in which case the form you should be signing is a W-4 and the misclassification question is worth raising before you start.
Employers do not collect I-9s from contractors, because the obligation does not exist for them. If a company asks you to complete an I-9 and then pays you on invoice with no withholding, those two facts do not fit together. That is worth a conversation. The classification factors
What each form actually asks
Notice what the W-9 does not ask for: no date of birth, no documents, no address history, nothing about immigration status beyond the single U.S. person certification. If a form calling itself a W-9 asks you for a passport scan or a driver’s license, it is not a W-9. Verifying a request
If you are the one collecting these
- Decide the worker’s status first, then send one form. Classification drives the paperwork; the paperwork never settles the classification.
- Employees: I-9 plus W-4. Contractors: W-9 only.
- Keep I-9s separate from personnel files, so an inspection does not expose unrelated records.
- The retention clocks differ: four years or so for a W-9, and for an I-9 three years after hire or one year after termination, whichever is later.
- Never use a W-9 as a substitute for work-authorization checking. It verifies nothing of the kind.
Frequently asked questions
Is a W-9 the same as an I-9?
No, and they are not even administered by the same agency. Form W-9 is an IRS tax form that certifies a taxpayer identification number for someone who is not an employee. Form I-9 is a U.S. Citizenship and Immigration Services form that verifies an employee’s identity and authorization to work in the United States.
Do independent contractors fill out an I-9?
No. Employment eligibility verification applies to employees. A genuine independent contractor completes a W-9 and no I-9.
My employer gave me both a W-9 and an I-9. Is that a mistake?
Almost certainly. Receiving an I-9 means the company is treating you as an employee, and employees complete a Form W-4 rather than a W-9. Getting both suggests the paperwork was assembled from the wrong template. Ask before you sign either.
Which form proves I can work in the United States?
The I-9. A W-9 proves nothing about work authorization. It records a name and a taxpayer identification number and certifies that you are a U.S. person for tax purposes, which is a different question from immigration status.
Does a W-9 go to the government like an I-9?
Neither goes to the government routinely. The employer keeps the I-9 on file and produces it if an authorized agency inspects. The requester keeps the W-9 and never files it with the IRS.
General information, not tax advice. This page explains a federal tax form in plain English. It is not legal, tax, or accounting advice, and W9Form.org is not affiliated with the IRS. Verify everything against the official Form W-9 page on IRS.gov and speak to a licensed professional about your own situation. How we source and review these pages.