Common I-9 Mistakes and How to Avoid Them

Most Form I-9 problems are not dramatic. They are small, common errors that add up. With enforcement increasing, those small errors carry more weight than they used to. This page lists the mistakes that come up most often and shows you how to avoid each one.

Why this matters more now. In a March 16, 2026 update, ICE moved 10 or more error categories from "technical" to "substantive." Technical errors used to come with a 10-business-day window to fix them. Substantive errors carry an immediate fine with no cure window, and a 5-year statute of limitations applies.

1. Missing required information in Section 1 or Section 2

Blank or incomplete fields are the most common problem, and many are now treated as substantive. In Section 1, watch for a missing date of birth, A-Number or USCIS number, I-94 number, or work-authorization expiration date, plus missing other names used or a missing physical address. In Section 2, watch for incomplete document information, meaning a missing title, number, or expiration for a List A, B, or C document, and a missing first day of employment in the certification.

Tip: Before you file any I-9, read every field one more time. An empty box that should have an entry is the easiest error to catch and the easiest to prevent.

2. Using the wrong edition of the form

Using an outdated form is a frequent and avoidable error. Make sure the edition date in the bottom-left and the expiration date in the top-right match a currently acceptable version. Note the rules around the July 31, 2026 deadline. Our current I-9 version guide spells out exactly which editions are allowed.

3. Missing the 3-business-day deadline

The employer must complete Section 2 within 3 business days of the start date. Completing it late, or not at all, is a clear violation. Build the I-9 into your onboarding checklist so Section 2 is done on time, every time. Remember that the employee must finish Section 1 by the end of day one.

4. Not reverifying expiring work authorization

When an employee's work authorization has an expiration date, you generally must reverify it before it lapses, using Supplement B. Forgetting this is a serious and common slip. The fix is to record every work-authorization expiration date the moment you complete Section 2, and set a reminder well ahead of the date.

5. Document abuse: demanding specific documents

This one is illegal. The employee chooses which valid document or documents to present from the Lists. You must accept any valid choice. You may not demand a specific document, ask for more documents than required, or reject genuine documents because of how someone looks or sounds. This is document abuse.

The rule is simple. Let the employee decide what to present. Your job is to check that the documents reasonably appear genuine and relate to the person, then record them. Our acceptable documents guide shows what counts under Lists A, B, and C.

6. Retention gaps

Failing to keep I-9s for the full required period is another common gap. The rule is to keep each form for 3 years after the hire date or 1 year after employment ends, whichever is later. You also need to be able to produce them fast, because a government inspection gives only a short window. Disorganized or missing files turn a routine inspection into a problem.

7. Correcting errors the wrong way

When you find a mistake, fix it the right way. Draw a single line through the error, enter the correct information, then initial and date the change. Never erase, never use white-out, and never backdate a form. Doing corrections improperly can look like you are hiding something.

How to stay ahead of these mistakes

The best defense is a regular, voluntary internal review. Pull your I-9s and check them against the items above before anyone else does. Look for blank fields, confirm each form is a currently acceptable edition, check that Section 2 was completed on time, and flag any work authorization that is coming up for reverification. When you find an error, correct it with the proper line-through, initial, and date method rather than starting over or hiding it.

Consistency is what keeps these mistakes from piling up. A short onboarding checklist, a calendar reminder for every expiration date, an organized filing system, and a periodic self-review together prevent most of the issues on this page. None of these steps is complicated, and each one removes a category of risk.

Our I-9 self-audit guide walks through how to run a review and correct errors properly.

It also helps to understand the stakes. Substantive or paperwork violations are penalized per form, and knowingly employing an unauthorized worker carries far higher penalties. See our I-9 penalties guide for the current figures. For anything involving a government notice, or for your specific situation, consult an immigration attorney.

Run an I-9 self-audit →

By the Easy Guides Editorial Team

Frequently asked questions

Missing or incomplete fields are the most common problem. Many of these, such as a missing date of birth or missing document information, are now treated as substantive errors with no cure window.

No. The employee chooses which valid documents to present from the Lists. Demanding specific documents, asking for extra documents, or rejecting genuine ones is document abuse, which is illegal.

Draw a single line through the error, write in the correct information, then initial and date the change. Never erase, use white-out, or backdate the form.

Keep each I-9 for 3 years after the hire date or 1 year after employment ends, whichever is later, and store it where you can produce it quickly during an inspection.

Common Form I-9 Mistakes to Avoid