Form I-9 Supplement B: Reverification and Rehire

Supplement B is the part of Form I-9 you use to reverify work authorization or to record a rehire. In the form overhaul that took effect on August 1, 2023, Supplement B replaced the old Section 3. It is now a separate page you only use when you need it. This guide explains when reverification is required, when it is not, and how to complete the form.

What Supplement B is for

You complete Supplement B in two main situations. The first is reverification, when an employee's temporary work authorization is set to expire. The second is rehire, when you bring a former employee back within a short period and want to update their existing I-9 instead of starting a new one. The employer completes Supplement B, not the employee.

It helps to know how Supplement B fits into the rest of the form. In the August 1, 2023 overhaul, Sections 1 and 2 were placed together on one page. Supplement A is the preparer or translator certification, used when someone helps the employee fill out Section 1. Supplement B is the reverification and rehire page. You only use each supplement when the situation calls for it.

When reverification is required

Reverification is required when an employee's permission to work has an expiration date that is coming up. Some workers have temporary work authorization. When that authorization is about to end, you must confirm the employee is still allowed to work before the current authorization expires.

At reverification, the employee may show a new document. As always, the employee chooses which valid document to present, and you must accept any valid choice. You may not demand a specific one, because demanding certain documents is document abuse and is illegal. The employee can present a List A document, or a List C work authorization document, to prove they may keep working. You record the new document details and sign Supplement B.

When reverification is NOT required

Reverification does not apply to everyone with an expiration date on a document. You should not reverify in these common cases:

• U.S. citizens and noncitizen nationals. Their status does not expire, so you never reverify them.
• Permanent Resident Cards (green cards), as a general rule. A green card may show an expiration date, but that date refers to the card, not the person's right to work. You generally do not reverify based on a green card expiring.
• List B identity documents. Do not reverify just because a driver's license or other identity document expires.

If you are unsure whether a document triggers reverification, check the rules on uscis.gov or speak with an immigration attorney.

Using Supplement B for a rehire

If you rehire a former employee within a short period, you may use Supplement B to update their original I-9 rather than complete a brand new form. You enter the rehire date and confirm the worker is still authorized to work. If their authorization has changed or expired, you handle that as a reverification at the same time.

How to complete Supplement B

Supplement B is short, but every field matters. To complete it:

1. Enter the employee's name at the top so the supplement is tied to the right person.
2. Enter the date of rehire, if this is a rehire.
3. For reverification, record the title, number, and expiration date of the new document the employee shows you.
4. Sign and date the form, and add your name as the person completing it.

Fill in each field completely. Incomplete information can be treated as a serious error during an inspection. If you make a mistake, correct it the proper way. Draw a single line through the wrong entry, write the correct information, then initial and date it. Never erase, white-out, or backdate.

Keep it with the original form

Supplement B stays with the original Form I-9. Follow the same retention rule for the whole record. Keep each I-9 for 3 years after the hire date or 1 year after employment ends, whichever is later. Whichever date is later is the one you use, so do not throw out a record too soon. Learn more on the I-9 retention page.

One more reminder on enforcement. As of March 16, 2026, immigration authorities moved many error types into the substantive category, which can bring an immediate fine with no chance to fix the mistake first. Incomplete document information on a form like Supplement B falls into that category. That is why every field, every date, and every signature on Supplement B matters. Substantive paperwork violations currently run from about $288 to $2,861 per form.

For your day-to-day duties when you first hire someone, see Section 2 for employers. When in doubt about a tricky reverification, an immigration attorney can help.

By the Easy Guides Editorial Team