When a former employee returns to your company, one of the first questions is whether you need to complete a brand new Form I-9 or use the existing one. USCIS gives employers two options when rehiring someone within a certain timeframe — but for most employers, one option is clearly better than the other.
Our recommendation after 27+ years of I-9 compliance work: complete a new Form I-9 for every rehire. It's simpler, cleaner, and eliminates an entire category of compliance mistakes. Here's why — and exactly how to handle it.
Technically, if you rehire an employee within 3 years of the date their previous Form I-9 was completed, USCIS gives you two options:
Both are fully compliant. But we recommend Option 1 — a new Form I-9 — for the vast majority of employers. Here's why.
Process simplicity. One workflow for all hires — new and returning — eliminates the need for your staff to determine when Supplement B applies, locate the original I-9, verify it's within the 3-year window, and check document expiration status. Fewer decision points means fewer mistakes, especially during high-volume onboarding.
Lower compliance risk. Every time someone has to decide "Is this a Supplement B situation or a new I-9 situation?", there's a chance they get it wrong. When your policy is simply "new I-9 for every hire," there's nothing to get wrong.
Cleaner form version management. Supplement B must stay attached to the original Form I-9 — which may be on an older form version. During form transitions (the current 08/01/2023 edition expires 05/31/2027), this creates version sprawl where your files contain a mix of old and current forms. New I-9s mean everyone is on the current form version.
E-Verify is a non-issue. The one argument for Supplement B is that it avoids creating a new E-Verify case. But if you use I-9 software that auto-submits E-Verify cases, there's no extra work involved in a new I-9. The case is created and submitted automatically.
There is one scenario where Supplement B can be the better choice: small, stable workforces with infrequent rehires. If you have a 20-person office and someone comes back after a year, using Supplement B is straightforward — you know exactly where the original I-9 is, the form version is current, and the time savings per employee is real.
But at any kind of scale — seasonal workforces, staffing companies, multi-location employers, companies with high turnover — the process complexity of Supplement B outweighs the per-employee time savings.
Our compliance team has helped hundreds of companies build I-9 policies that hold up under audit — including rehire workflows for seasonal, staffing, and multi-location employers. Schedule a free compliance call to talk through your specific situation, or try our I-9 Risk Calculator to assess your overall compliance risk.
If the rehire happens more than 3 years after the original Form I-9 was completed, you must complete a new Form I-9. Supplement B is not an option in this case — regardless of your policy.
This is measured from the date the original I-9 was completed, not the employee's last day of work. That distinction matters because the I-9 completion date and the separation date can be months or years apart.
If you follow our recommendation to complete new I-9s for all rehires, the 3-year rule becomes irrelevant — you're doing a new I-9 anyway.
Regardless of your preferred policy, a new Form I-9 is required in these situations:
When you complete a new I-9 for a rehire, follow the standard process: Section 1 on or before the employee's first day of work (their rehire date), and Section 2 within 3 business days.
Not every return to work counts as a rehire. U.S. Citizenship and Immigration Services (USCIS) distinguishes between employees who are rehired (left and came back) and employees in continuing employment (never truly left). Continuing employees do not need any updates to their I-9.
The following situations are generally considered continuing employment — no new I-9 or Supplement B is needed:
The key question is whether the employee had a reasonable expectation of employment at all times. If they did, they're a continuing employee — not a rehire.
Factors USCIS considers when evaluating reasonable expectation include:
If your company participates in E-Verify, the answer depends on which I-9 path you take:
If the original E-Verify case was never created, was closed before receiving a final result, or resulted in anything other than "Employment Authorized," you should complete a new Form I-9 and create a new E-Verify case regardless.
This is one of the most common rehire situations, especially in agriculture, hospitality, and construction. For seasonal employers, we strongly recommend a new I-9 for each returning worker. The volume of returning employees, the use of seasonal staff to process paperwork, and the mix of form versions all make Supplement B a compliance liability at scale. A clean new I-9 for every returning worker keeps the process simple and audit-ready.
That said, some seasonal employees may qualify as continuing employees if they have a reasonable expectation of returning each season. In that case, no I-9 update is needed at all — but document your reasoning in case of an audit.
Within the 3-year window, so technically you have a choice. Our recommendation: complete a new I-9 and move on. It takes a few extra minutes but eliminates any question about form versions, document expiration, or whether the original I-9 was properly completed.
Beyond the 3-year window. You must complete a brand new Form I-9 with full Section 1 and Section 2. You may have already disposed of the original I-9 per retention rules.
USCIS does not require an updated I-9 for name changes, but it is recommended. A new Form I-9 with the current legal name is the cleanest approach — no notes, no attachments, no ambiguity.
When one company acquires another, the new employer has two options for acquired employees:
If an acquired employee later leaves and is rehired by the new company, the standard rehire rules apply — measured from whenever that employee's most recent I-9 was completed.
If a temporary staffing agency employee transitions to a permanent role at the client company, this is typically a new hire for the client — even if the person has been working at the client's site for months. The client company must complete its own Form I-9 for the employee. The staffing agency's I-9 does not transfer.
If you rehire someone within 3 years of when their original Form I-9 was completed, you can either complete a new I-9 or use Supplement B on the existing form. After 3 years, a new Form I-9 is required. The clock starts from the I-9 completion date, not the employee's last day of work. We recommend completing a new I-9 regardless of timing — it's simpler and eliminates process decisions.
No. Supplement B is an option, not a requirement. Employers always have the right to complete a new Form I-9 instead. Many employers — especially those with high-volume or seasonal rehires — choose to skip Supplement B entirely and complete new I-9s for every returning employee.
Yes. A name change does not prevent you from using Supplement B. You can note the new legal name in Supplement B. However, a new Form I-9 with the current name is cleaner and avoids any confusion during an audit.
It depends on whether they're classified as rehires or continuing employees. Seasonal employees who return regularly with a reasonable expectation of employment may qualify as continuing employees — no I-9 update needed. If they're treated as rehires, we recommend a new I-9 each time rather than using Supplement B, especially at scale.
If the original Form I-9 is lost, destroyed, or was never properly completed, you must complete a brand new Form I-9. Supplement B requires the original I-9 to exist and be legible. This is another reason to default to new I-9s — you never have to worry about locating a prior form.
It depends on how the acquiring company handled the transition. If they retained the original I-9s and treated acquired employees as continuing employees, then the standard rehire rules apply if the employee later leaves and returns. If they completed new I-9s at the time of acquisition, those set the new 3-year clock.
Rehire compliance is only as good as your I-9 recordkeeping. If you can't quickly locate an employee's original I-9 and determine whether it's still within the 3-year window, you're already at risk — which is exactly why a "new I-9 for every rehire" policy is the safest approach. i9 Intelligence helps companies manage I-9 compliance electronically — including remote Section 2 verification for rehires in any location, automated E-Verify submission, and full I-9 audits to catch problems before U.S. Immigration and Customs Enforcement (ICE) does.
