Researched by the I9AuditReady Research Team · Last Updated: April 2026

Form I-9 Supplement B: Reverification and Rehire Guide (2026)

Key Fact

Supplement B of Form I-9 replaced the former Section 3 for reverification and rehire documentation as of August 1, 2023. Employers using the current Form I-9 (edition date 08/01/23) must use Supplement B — not Section 3 — for all reverification and rehire events on that form.

What Is Supplement B and When Was It Introduced?

Supplement B, formally titled "Reverification and Rehire," is the section of Form I-9 used to document two post-hire events:

Reverification: When an employee's temporary employment authorization is expiring, the employer must verify renewed authorization before it lapses.
Rehire: When a former employee returns to work within 3 years of when their original Form I-9 was completed.

USCIS redesigned Form I-9 significantly in the August 2023 revision. The most visible structural change was moving reverification and rehire documentation from Section 3 (which appeared on the main form) to a separate Supplement B that can be printed as needed. This change allows employers to track multiple reverification and rehire events without running out of space.

Employers who complete a new Form I-9 using the 08/01/23 edition should use Supplement B for all reverification and rehire events. Older forms with Section 3 can still use Section 3 for events on those existing forms.

When to Use Supplement B

Situation 1: Reverification of Expiring Work Authorization

When an employee presented a time-limited work authorization document (such as an Employment Authorization Document, certain visa-based authorizations, or other temporary authorization), the authorization has an expiration date. Before that date arrives, the employer must reverify the employee's continued work authorization.

The reverification deadline is on or before the date the existing authorization expires — not after. If authorization expires on June 30, Supplement B must be completed by June 30. An employee with expired work authorization cannot continue working while reverification is pending.

Statistic: Employers who fail to track document expiration dates and reverify on time face the same civil penalties as initial I-9 violations — up to $2,507 per paperwork violation and up to $27,894 per instance of knowingly continuing to employ an unauthorized worker.

Situation 2: Rehire Within 3 Years

If a former employee is rehired within 3 years of the date their original Form I-9 was completed, the employer may use Supplement B on the existing form instead of completing an entirely new I-9. To use this option:

Examine a document showing the employee is still authorized to work (List A or List C document)
Record the document details in Supplement B
Sign and date the Supplement B entry

If the employee is rehired more than 3 years after the original I-9 date, you must complete a new Form I-9 from scratch.

Step-by-Step Instructions for Completing Supplement B

1
Locate the existing Form I-9
Retrieve the original Form I-9 for the employee. Supplement B is completed on the same document (or on a new Supplement B page attached to the original).
2
Enter the date of rehire or reverification
In the first column of the Supplement B row, enter the date the employee was rehired, or — for reverification — the date you are completing the reverification. This cannot be after the expiration date of the prior authorization.
3
Examine the employee's document(s)
For rehire: examine a List A or List C document establishing work authorization. For reverification: examine a List A or List C document. You cannot use a List B (identity-only) document to reverify work authorization. The document must be unexpired and original.
4
Record document information
Enter the document title, issuing authority, document number, and expiration date (if any) in the Supplement B row. If the new authorization has no expiration, write 'N/A' in the expiration field.
5
Sign and date
The employer or authorized representative signs and dates the Supplement B entry. The employee does not sign Supplement B.
6
Retain the updated I-9
File the updated Form I-9 (with the new Supplement B entry) in your I-9 records. Update your tracking system with the new expiration date, if applicable.

Who Is Exempt from Reverification?

Certain employees are never subject to reverification, regardless of what expiration date may appear on their documents. Requiring reverification for exempt employees can itself constitute discrimination under the Immigration and Nationality Act.

Exempt from Reverification

U.S. citizens — their work authorization never expires
U.S. noncitizen nationals — same as citizens for reverification purposes
Lawful permanent residents who presented a Permanent Resident Card (Form I-551) without an expiration date — their status does not expire even if a card expires
Employees who presented a List B document for Section 2 — List B documents (identity-only) never have an expiration that triggers reverification

Note: If a lawful permanent resident presented a Permanent Resident Card that has an expiration date on its face, the employer is not required to reverify when the card expires. The underlying status (permanent residence) does not expire when the card does. USCIS explicitly prohibits employers from reverifying permanent residents' status.

Common Mistakes with Supplement B

Reverifying U.S. citizens or permanent residents

This is a form of document abuse. Never ask U.S. citizens or LPRs to re-prove work authorization. Their status does not expire.

Using Supplement B to verify rehires after the 3-year window

If more than 3 years have passed since the original I-9, you must complete a brand-new Form I-9 — you cannot use Supplement B.

Completing Supplement B after the authorization has already expired

Supplement B reverification must be completed on or before the expiration date. Completing it after means the employee was potentially working without valid authorization.

Accepting a List B (identity-only) document for reverification

Reverification requires evidence of work authorization — a List A or List C document. A driver's license (List B) proves identity but not work authorization.

Attaching a new Supplement B page from the current form to an old I-9

If your existing I-9 uses the older format with Section 3, complete Section 3 on that form — do not attach Supplement B pages from the 2023 version to older forms.

Track reverification deadlines automatically.

I9AuditReady alerts you 90, 60, and 30 days before each work authorization expires — so you never miss a Supplement B deadline.

Start Free — Track Reverification Deadlines

Frequently Asked Questions

When do I need to complete Supplement B?

You must complete Supplement B in two situations: (1) when an employee's temporary work authorization is expiring and you need to reverify their continued authorization to work — this must be done on or before the date the current authorization expires; and (2) when you rehire a former employee who left within the last 3 years and already has a Form I-9 on file. In both cases, you add the new information to the existing I-9 in the Supplement B section rather than starting a new form.

Can I use Supplement B for a rehired employee?

Yes, for employees rehired within 3 years of the original Form I-9 completion date, you may use Supplement B on the existing form instead of completing a new I-9. You examine a document that establishes either employment authorization (List A or List C) and record the document information in Supplement B. If the employee is rehired after 3 years, you must complete a new Form I-9.

Do U.S. citizens need Supplement B reverification?

No. U.S. citizens are never subject to reverification. Their work authorization does not expire. You should never place a future reverification date in Section 2 for a U.S. citizen, and you should never use Supplement B to reverify a U.S. citizen. The same applies to lawful permanent residents (green card holders) who presented a permanent resident card with no expiration date — their status does not expire.

How many times can Supplement B be used?

The current Form I-9 (08/01/23 edition) contains multiple Supplement B rows, allowing the employer to record multiple reverification or rehire events on the same document. However, when all available rows are used, you must start a new Form I-9 for any subsequent reverification or rehire events, and attach it to the original.

What if the old I-9 doesn't have Supplement B?

Supplement B replaced Section 3 in the August 1, 2023 revision. If you have an older Form I-9 that contains Section 3 (rather than Supplement B), you have two options: complete Section 3 on the existing older form as you normally would, or start a new Form I-9 using the current 08/01/23 edition with Supplement B. Either approach is acceptable. Do not attach a Supplement B page from the current form to an older I-9 that was designed for Section 3.

Related Resources

I9AuditReady provides employer compliance tools and research — not legal advice. Consult a qualified immigration attorney for advice specific to your situation.