What Is Form I-9? The Complete Employer Guide (2026)

Quick Answer

Form I-9, Employment Eligibility Verification, is a federal form that every U.S. employer must complete for each employee hired after November 6, 1986. It verifies an employee's identity and authorization to work in the United States. Failure to maintain compliant I-9 records can result in fines of $252 to $27,894 per violation under 8 CFR § 274a.10.

What Is Form I-9 and Why Does It Exist?

Form I-9, officially titled Employment Eligibility Verification, is a federal document administered by U.S. Citizenship and Immigration Services (USCIS). Every employer in the United States — regardless of size, industry, or location — is legally required to complete a Form I-9 for each individual hired after November 6, 1986.

The form exists because of the Immigration Reform and Control Act of 1986 (IRCA), which made it illegal for employers to knowingly hire or continue to employ unauthorized workers. Congress designed the I-9 process to create a documented verification system — giving employers a standardized method to confirm that their workforce is authorized to work in the United States.

An important distinction: Form I-9 is not about verifying citizenship — it is about verifying work authorization. U.S. citizens, lawful permanent residents, asylees, refugees, and many visa holders are all authorized to work. The I-9 process confirms authorization; it does not restrict who can be hired based on citizenship status.

Who Must Complete Form I-9?

Every employer in the United States must complete Form I-9 for every new employee — full-time, part-time, seasonal, and temporary — hired after November 6, 1986. There is no minimum company size threshold. A company with one employee must comply the same as a company with 10,000.

Who Is Included

• Full-time employees
• Part-time employees
• Seasonal and temporary employees
• Employees hired through a staffing agency (the agency completes the I-9)
• Agricultural workers and domestic household employees on the employer's payroll

Who Is Exempt

• Independent contractors: Individuals providing services as contractors rather than employees. Note: misclassifying employees as contractors to avoid I-9 requirements is itself a violation.
• Casual domestic workers: Individuals hired directly by a private household for sporadic or irregular domestic work (not on a formal employment basis).
• Employees hired before November 7, 1986: The law is not retroactive. Employees who were on payroll before the effective date are exempt — but if they were terminated and rehired, a new I-9 is required.

Statistic: Every year, ICE conducts thousands of I-9 audits. In FY 2023 alone, ICE Homeland Security Investigations initiated over 700 worksite enforcement actions. No industry is exempt — violations have been cited in healthcare, hospitality, agriculture, construction, and technology.

Form I-9 Sections Explained

The current Form I-9 (edition date 08/01/23, expiration 05/31/2027) consists of two main sections plus Supplement A (preparer/translator certification) and Supplement B (reverification and rehire). Each section has specific requirements, responsible parties, and deadlines.

Learn the exact field-by-field instructions in our How to Fill Out Form I-9 step-by-step walkthrough.

Acceptable Documents

USCIS publishes an official Lists of Acceptable Documents that all employers must follow. Documents are categorized into three lists:

Critical rule: Employees may present ONE List A document, OR a combination of ONE List B document and ONE List C document. Employers cannot require specific documents or refuse valid documents. Requiring a specific document — even with good intentions — can constitute document abuse under the Immigration and Nationality Act.

See the complete list with photos and verification tips: I-9 Acceptable Documents Guide

I-9 Deadlines

Missing I-9 deadlines is the most common source of substantive violations. The deadlines are strict and non-negotiable.

Statistic: The 3-business-day rule for Section 2 means weekends and federal holidays do not count. If a new hire starts on Friday, the employer has until the following Wednesday to complete Section 2.

Never calculate deadlines manually — use our I-9 Deadline Calculator to get the exact due date based on any start date.

Top 10 Common I-9 Mistakes Employers Make

According to ICE audit findings, the following errors appear most frequently. Each of these mistakes can result in fines even when the employer had no intent to hire unauthorized workers.

1. 1. Missing Section 2 employer signature

   Fix: The employer certification must be signed and dated by the employer or an authorized representative. An unsigned Section 2 is a technical violation. Correct it immediately with an annotation showing the correction date.

2. 2. Completing the I-9 late (after the 3-business-day deadline)

   Fix: If Section 2 is completed after the deadline, annotate the form with the actual completion date and a note explaining the delay. Late completion is a violation but is less severe than a missing I-9.

3. 3. Requiring specific documents (document abuse)

   Fix: Never tell an employee which documents to bring. Present the Lists of Acceptable Documents and let the employee choose. Demanding a specific document — even a U.S. passport — can trigger an INA § 274B discrimination complaint.

4. 4. Accepting expired documents

   Fix: All documents must be unexpired at the time of examination. A document that was valid when it was issued but has since expired is not acceptable for I-9 purposes (with narrow exceptions for automatic extension of certain EADs).

5. 5. Failing to reverify expiring work authorization

   Fix: Track document expiration dates and complete Supplement B before the employee's work authorization expires. I9AuditReady sends automatic alerts 90, 60, and 30 days before each expiration.

6. 6. Not retaining I-9s for terminated employees

   Fix: Keep I-9s for the longer of 3 years from hire or 1 year after termination. Store them separately from personnel files. Use our Retention Calculator to track every employee's I-9 retention deadline.

7. 7. Treating rehired employees like new hires

   Fix: For employees rehired within 3 years of the original I-9, you can complete Supplement B on the existing form rather than starting a new I-9. If rehired after 3 years, start a new Form I-9.

8. 8. Incorrect or incomplete employee information

   Fix: Section 1 errors — wrong name, missing date of birth, wrong status attestation — are the employee's responsibility but the employer's liability. Review Section 1 before completing Section 2.

9. 9. Using an outdated form version

   Fix: Always use the current USCIS-issued form. The current version has an edition date of 08/01/23 and expiration of 05/31/2027. Using a superseded version is itself a violation. See our I-9 Form 2026 guide for the current version details.

10. 10. Not having a consistent I-9 process across locations

    Fix: Each hiring manager handling I-9s must follow the same process. Inconsistency creates audit exposure. Train all managers and use a written I-9 policy. See our Compliance Checklist for a complete process framework.

I-9 Penalties

Under 8 CFR § 274a.10, I-9 violations carry civil penalties that are adjusted annually for inflation under the Federal Civil Penalties Inflation Adjustment Act. The current penalty schedule (effective 2024–2025) is:

Civil penalties are assessed per violation, per employee. A company with 50 employees and uncorrected paperwork violations could face fines of up to $125,350 for a first offense. Repeat violations bring penalties up to $27,894 per employee.

Calculate your specific fine exposure: I-9 Fine Exposure Calculator

How Long to Keep Form I-9

Under 8 CFR § 274a.2, employers must retain completed Form I-9 for the longer of:

• 3 years from the date of hire, OR
• 1 year from the date employment ends

The two-prong rule means long-tenured employees have a shorter post-termination retention window, while brief employees have a longer one. For example: an employee hired on January 1, 2020 and terminated on December 31, 2020 — the I-9 must be retained until January 1, 2024 (3 years from hire, because that is longer than 1 year from termination).

I-9 forms must be stored separately from employee personnel files. This is because during an ICE audit, you may be required to produce I-9 records — and you do not want auditors reviewing unrelated HR documents.

Use our I-9 Retention Calculator to compute the exact retention deadline for any employee.

E-Verify and Form I-9

E-Verify is a web-based system operated by USCIS and the Social Security Administration that allows employers to electronically verify the work authorization of newly hired employees. E-Verify is a separate process from Form I-9 — completing one does not substitute for the other.

Form I-9 is required for all U.S. employers. E-Verify is required for:

• Federal contractors and subcontractors under federal contract FAR E-Verify clause
• Employers in states with mandatory E-Verify laws (currently 20+ states require it for some or all employers)

When using E-Verify, employers must still complete Form I-9 first. The E-Verify case is then created within 3 business days of the employee's start date, using the information from the I-9. Under the DHS alternative procedure (available to E-Verify employers), Section 2 document examination can be done remotely via video call.

Learn more: Complete E-Verify Guide

I-9 for Remote Employees

The standard I-9 process requires the employer (or authorized representative) to physically examine original documents in person. For remote employees, this creates a logistical challenge. There are two recognized solutions:

Option 1: Authorized Representative

Any person designated by the employer — a notary public, HR professional, coworker, or even the employee's neighbor — can act as an authorized representative to physically examine the documents and complete Section 2. The authorized representative signs on behalf of the employer. The employer remains legally liable for any errors or fraud.

Option 2: DHS Alternative Procedure (E-Verify Employers Only)

As of August 1, 2023, employers enrolled in E-Verify may use the DHS-authorized alternative procedure: the employee transmits clear copies of their identity/work authorization documents, and the employer examines them via a live video interaction. The employer must retain copies of the documents and annotate Section 2 with "Alternative Procedure." This procedure is only available to employers currently enrolled in E-Verify — it cannot be used retroactively.

Full guide: Remote I-9 Verification Guide

What Happens During an I-9 Audit?

An I-9 audit begins when ICE issues a Notice of Inspection (NOI) — a written demand for your I-9 records. You have 3 business days to produce them. ICE will request:

• Form I-9 for every current employee
• I-9s for employees terminated within the past 3 years
• Payroll records with hire dates
• A complete employee roster with hire and termination dates

After review, ICE may issue: a Notice of Inspection Results (no violations), a Notice of Technical Violations (correctable errors — 10 business days to fix), or a Notice of Intent to Fine (substantive violations with proposed penalty amounts). You have the right to contest findings in writing.

Full emergency guide: What to Do When ICE Shows Up

Know your I-9 risk before ICE does.

I9AuditReady tracks deadlines, flags errors, and alerts you before violations happen. Start free — no credit card required.

Frequently Asked Questions

Related I9AuditReady Resources

• How to Fill Out Form I-9 — Step-by-Step Instructions
• Form I-9 Supplement B: Reverification and Rehire Guide
• I-9 Form 2026: Current Version and Updates
• Remote I-9 Verification Guide
• What to Do When ICE Shows Up at Your Business
• Complete List of Acceptable I-9 Documents
• I-9 Fine Exposure Calculator
• I-9 Deadline Calculator
• I-9 Retention Calculator
• E-Verify Guide
• I-9 Compliance Checklist (Free Download)