How to Complete an I-9 Without Making Common Mistakes

The I-9 is one of those forms that shows up in every single onboarding. You do it so often it can start to feel like a formality. But here's the thing: it's actually a federal compliance document, and small mistakes can turn into big problems if you're ever audited.

The good news is that when you understand what the form is asking for and follow the same process every time, it's completely manageable. This walkthrough breaks it all down so you can complete the I-9 confidently and keep your records clean.

What the I-9 Actually Does

The I-9 verifies two things: that the employee is who they say they are, and that they're legally authorized to work in the United States. It's required for every employee you hire, whether they're full-time, part-time, or temporary. No exceptions.

Because it's a federal requirement, there are strict rules around timing, document review, and recordkeeping. If your forms are incomplete or filled out incorrectly during an audit, you're looking at compliance penalties.

What You Can and Cannot Do When Reviewing Documents

Before we get into the form itself, let's clear something up because this is one of the most common places HR gets it wrong.

You can:

• Review whatever documents the employee chooses to present

• Confirm the documents appear reasonably genuine and relate to the person presenting them

• Record the document information in Section 2

  
  

You cannot:

• Tell employees which specific documents to bring

• Ask for more documents than the form requires

• Reject documents that appear reasonably valid

  
  

The employee gets to decide what they hand you. Your job is to review it, not direct it. Overstepping here is one of the fastest ways to create a compliance issue.

Common Mistakes to Watch Out For

Even when people understand the form, these slip-ups happen more than they should:

• Missing signatures. Both the employee and employer need to sign their respective sections. If either is blank, the form is incomplete.

• Completing sections late. Section 1 is due by the employee's first day. Section 2 is due within three business days of the start date. These are not suggestions.

• Incomplete document information. When recording documents, you need the document number, issuing authority, and expiration date (when applicable). Missing fields are a red flag in audits.

• Accepting documents not on the list. Only documents from the I-9's List of Acceptable Documents count. If it's not on the list, it doesn't qualify.

  
  

Staying sharp on these details keeps your records consistent and your organization protected.

Section 1: Completed by the Employee

Section 1 is the employee's responsibility and must be completed no later than their first day of work.

They'll fill in their basic information:

• Full legal name

• Address

• Date of birth

• Social Security number (required in some cases)

• Email and phone number (optional)

  
  

They'll also select their work authorization status:

• U.S. citizen

• Noncitizen national

• Lawful permanent resident (must provide USCIS/A-Number)

• Authorized to work (must provide expiration date if applicable, plus one of the following: USCIS/A-Number, Form I-94 Admission Number, or Foreign Passport Number and Country of Issuance)

  
  

The employee signs and dates at the end of the section. Your role here is to make sure the section is fully completed before you move on. If something's blank, flag it before their start date.

Section 2: Completed by the Employer

Section 2 is on you, and it needs to be done within three business days of the employee's start date.

The employee brings documents that confirm both their identity and their work authorization. Those documents fall into two categories:

List A: One document that covers both identity and work authorization, like a U.S. passport, permanent resident card, or employment authorization card.

List B + List C: Two documents instead of one. List B confirms identity (like a driver's license) and List C confirms work authorization (like a Social Security card).

You review the documents, confirm they appear reasonably genuine, and record the information in Section 2. Then you complete the employer certification. That's it.

What About Remote Employees?

Remote hires add a layer of complexity. Normally, documents have to be reviewed in person. When that's not possible, you can designate an authorized representative (a manager, notary, or another trusted person) to review documents on your behalf.

Some employers may also qualify to use approved virtual verification methods, depending on current federal guidelines. Either way, the employer is still on the hook for making sure the I-9 is completed correctly and on time. Remote doesn't mean it can slide.

What to Do If There's a Mistake

Mistakes happen. When they do, here's how to handle them the right way:

• Draw a single line through the incorrect information

• Write the correct information next to it

• Initial and date the correction

• Do not use whiteout, erasing, or correction tape

  
  

The goal is a clear paper trail. If a section was missed entirely, complete it as soon as you catch it and document the correction. Auditors aren't just looking at whether the form is filled out. They're looking at whether it's been handled with care.

Keep It Consistent

The I-9 doesn't have to be a stressful part of onboarding. When you follow the same process for every new hire, review documents carefully, and record information accurately, it becomes routine.

The key is treating it like the compliance document it is, not just another box to check. Get it right from the start and you'll rarely have to deal with it again.