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Formulario I-9, Verificación de Elegibilidad de Empleo, page 1
Complex · 70/100Form Complexity Index

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What this form asks for

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Formulario I-9 is a U.S. Citizenship and Immigration Services (USCIS) form required for all employers to verify the identity and employment authorization of individuals hired for employment in the United States. Both employees and employers must complete their respective sections to comply with federal law. Today, this form can be filled out quickly and accurately using AI-powered services like Instafill.ai, which can also convert non-fillable PDF versions into interactive fillable forms.
Fillable fields130
Pages5
Sections23
Tables and lists3
Questions that depend on earlier answers40
Form Complexity IndexComplex, 70/100

The AI checks your answers before you download

12 checks built for this form, so a wrong date or a missing answer is caught before anyone else sees it.

Validates Citizenship Status Selection

This check ensures that the employee has selected exactly one of the four available citizenship or immigration status options in Section 1. Selecting none or more than one option makes the attestation invalid. Failure to select a single, valid status will prevent form submission and require the employee to correct the section before proceeding.

Conditional Requirement for Lawful Permanent Resident

This validation verifies that if an employee checks the box for 'Residente permanente legal' (Lawful Permanent Resident), they must also provide an Alien Registration Number (A-Number) or USCIS Number. This number is required to confirm the employee's status. If the status is selected but the number is missing, the form will be considered incomplete and an error will be flagged.

Conditional Requirement for Alien Authorized to Work

This check ensures that if an employee selects 'Extranjero autorizado para trabajar' (Alien authorized to work), they must provide a work authorization expiration date and one of the required document numbers (USCIS/A-Number, Form I-94 Admission Number, or Foreign Passport Number). This information is critical for verifying temporary work authorization. A failure will result in an error message indicating that required information for the selected status is missing.

Validates Social Security Number Format

This check verifies that the 'Número de Seguro Social de EE. UU.' field contains a 9-digit number. While the SSN is not mandatory for all employees on their first day, if a number is entered, it must conform to the standard format. This prevents data entry errors and ensures data integrity for payroll and tax purposes. An invalid format will trigger an error.

Validates All Date Formats (mm/dd/yyyy)

This validation ensures that all date fields on the form, such as 'Fecha de Nacimiento', 'Fecha de Hoy', and document expiration dates, are entered in the correct mm/dd/yyyy format. Consistent date formatting is crucial for legal compliance and record-keeping. Any date entered in an incorrect format will be rejected, and the user will be prompted to correct it.

Section 1 Signature Date Timeliness

This check verifies that the employee's signature date in Section 1 is on or before the 'Primer día de trabajo del empleado' (Employee's First Day of Employment) listed in Section 2. The law requires employees to complete Section 1 by their first day of work. A signature date after the first day of employment is a compliance violation and will be flagged as an error.

And 6 more checks
  • Section 2 Document Combination Logic
  • Section 2 Document Expiration Date Validity
  • Section 2 Employer Completion Deadline
  • Supplement A Preparer/Translator Certification Completeness
  • Supplement B Reverification Document Logic
  • Name Consistency Across Form Sections

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How to Fill Out Formulario I-9 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload or select the Formulario I-9.
  2. As the employee, provide your personal information in Section 1, including your full name, address, date of birth, and Social Security Number.
  3. Attest to your citizenship or immigration status by checking the appropriate box in Section 1 and providing any required document numbers.
  4. Sign and date Section 1. If a preparer or translator assisted you, they must complete and sign Supplement A.
  5. As the employer, physically examine the original documents presented by the employee to verify their identity and employment authorization.
  6. Complete Section 2 by recording the document titles, issuing authorities, numbers, and expiration dates, then sign and date the employer certification.
  7. Review all sections for completeness and accuracy before securely storing the form as required by law.

Common Mistakes in Completing Formulario I-9

The ones the AI is built to catch.

Incorrect or Inconsistent Date Formatting
The form explicitly requires dates in a mm/dd/aaaa format, but users often enter them in other formats like dd/mm/yyyy or m/d/yy. This happens due to habit or not paying close attention to the instructions. Inconsistent or incorrect date formats can lead to processing delays or the form being flagged as incorrect during an audit. To avoid this, carefully follow the specified format for all date fields, including birth dates, signature dates, and document expiration dates. AI-powered tools like Instafill.ai can help by automatically formatting dates correctly as you fill out the form.
Leaving Required Fields Blank Instead of Using 'N/A'
Employees often leave fields that don't apply to them, such as 'Inicial de Segundo Nombre' (Middle Initial) or 'Otros Apellidos Utilizados' (Other Last Names Used), completely blank. However, USCIS instructions typically require that you enter 'N/A' (Not Applicable) in these fields. Leaving fields blank can result in the form being considered incomplete, which is a compliance violation. Always fill every field in Section 1, using 'N/A' for any that do not apply to you.
Incorrect Timing of Section 1 Completion and Signature
A frequent compliance error is completing Section 1 at the wrong time. The employee must complete and sign Section 1 only after they have accepted a job offer, and no later than their first day of employment. Signing before a job offer is made or after the first day of work violates I-9 rules. This can lead to fines for the employer during an audit. To prevent this, employers should integrate the I-9 completion into their first-day onboarding process and provide clear instructions on the timing.
Misclassifying Citizenship or Immigration Status
Employees can be confused by the four attestation categories and may check the wrong box. For example, a lawful permanent resident might mistakenly check 'Ciudadano de Estados Unidos' (U.S. Citizen). This is a serious error that constitutes a false claim and can have severe immigration consequences. Employees should carefully read the definitions in the form instructions to select the correct status. If unsure, they should consult the official USCIS I-9 instructions or seek guidance from an immigration expert, not the employer.
Forgetting to Provide Required Document Numbers for Non-Citizens
When an employee attests to being a 'Residente permanente legal' (Lawful Permanent Resident) or an 'Extranjero autorizado para trabajar' (Alien Authorized to Work), they must provide an associated document number, such as an Alien Registration Number (A-Number) or Form I-94 Admission Number. It is a common oversight to check the box but forget to enter the required number and expiration date. An incomplete attestation invalidates Section 1. To avoid this, double-check that all required fields corresponding to your selected status are filled in completely.
Improperly Recording Documents in Section 2
Employers frequently make errors when recording the employee's documents in Section 2. Common mistakes include accepting an invalid combination of documents (e.g., two from List B), failing to record all required information (document title, issuing authority, number, and expiration date), or accepting and recording expired documents. These errors are major red flags in an I-9 audit and can result in significant financial penalties. Employers must carefully follow the rule of accepting either one document from List A or one from List B and one from List C, and meticulously record all details from unexpired, original documents.
Over-documenting by Requesting or Recording Too Many Documents
Some employers, in an attempt to be thorough, ask for more documents than the law requires (e.g., asking for a passport AND a driver's license). This practice, known as 'over-documenting,' is prohibited and can be considered a discriminatory practice, as it may place an undue burden on the employee. Employers must allow the employee to choose which acceptable documents to present and must not ask for more than the minimum required to satisfy the I-9 requirements. Recording more documents than necessary can also lead to compliance issues.
Missing Preparer and/or Translator Certification
If anyone helps the employee complete Section 1, such as a family member or translator, that person is required to fill out and sign the 'Suplemento A, Certificación del Preparador y/o Traductor'. This is one of the most frequently missed parts of the form, especially when assistance is provided informally. Failure to complete this supplement when required makes the Form I-9 incomplete and non-compliant. Employers should ask employees if they received help and ensure the supplement is completed and attached if the answer is yes.
Using an Outdated Version of the Form I-9
USCIS periodically updates the Form I-9, and employers are required to use the most current version. Using an expired or outdated version of the form is a substantive violation that renders the employment verification invalid. Employers must always check the USCIS website for the latest version of the form before providing it to a new hire. The edition date is printed on the bottom of each page (e.g., 'Form I-9 Edition 01/20/25').
Confusing List A and List C Documents
The form lists specific documents for each category, but employers can still get them confused. A classic example is miscategorizing the Employment Authorization Document (Form I-766) as a List C document when it is actually a List A document. This error leads the employer to incorrectly request a List B document from the employee, resulting in over-documentation and potential discrimination claims. Carefully referencing the 'Lists of Acceptable Documents' page is crucial to avoid this mistake. AI-powered form-filling tools like Instafill.ai can also help by guiding users to enter documents in the correct sections.

Frequently Asked Questions About Formulario I-9

 

Is it really free for 7 days?
Yes. You pay $0 today. Cancel before Nov 10 and you are never charged. Keep it, and it is $19.99 a month for 5 fills of your Formulario I-9.
Can I fill other forms too?
This plan is for your Formulario I-9: your own AI agent fills it as often as 5 times a month. To fill other forms and upload your own, choose a Professional plan from your account.
How do I cancel?
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How does the AI fill out Formulario I-9?
You answer a few questions in plain words, or upload a document you already have. The AI reads what you give it and puts each answer into the right field of Formulario I-9, on every page, in seconds. It checks the answers against the form's own rules, and you review and change anything before you download, print or sign.
What happens to my information?
It is encrypted in transit and at rest, and it is never used to train AI.
How complex is Formulario I-9 to fill out?
Formulario I-9 has a Form Complexity Index of 70 out of 100, in the complex tier: 130 fillable fields across 5 pages. Instafill.ai's AI fills it in under a minute, with every field there for you to review before you download.
What is the purpose of Form I-9, Verificación de Elegibilidad de Empleo?
Form I-9 is used to verify the identity and employment authorization of individuals hired for employment in the United States. It must be completed for every new hire.
Who is responsible for completing Form I-9?
Both the employee and the employer have responsibilities. The employee must complete and sign Section 1, while the employer must complete Section 2 after examining the employee's documents.
As an employee, when do I need to complete Section 1?
You must complete and sign Section 1 of the form on or before your first day of work, but not before you have accepted a job offer.
What documents do I need to provide for Form I-9?
You must present either one unexpired document from List A or a combination of one unexpired document from List B and one from List C. Your employer cannot tell you which specific documents to present.
What is the difference between List A, List B, and List C documents?
List A documents establish both identity and employment authorization (e.g., a U.S. Passport). List B documents establish identity (e.g., a Driver's License), and List C documents establish employment authorization (e.g., a Social Security card).
When does my employer need to complete Section 2?
Your employer must complete their section and physically examine your documents within three business days of your first day of employment.
What if a family member or translator helped me fill out the form?
If anyone helped you prepare or translate Section 1, they must complete and sign the 'Suplemento A, Certificación del Preparador y/o Traductor' to certify their assistance.
Is providing my Social Security Number mandatory in Section 1?
Providing your Social Security Number is generally voluntary for Form I-9. However, it is mandatory if your employer uses the E-Verify system.
What is Supplement B, Reverificación y Recontrataciones, used for?
Supplement B is used by the employer if your employment authorization needs to be re-verified, if you are rehired within three years, or to record a legal name change.
Can my employer demand to see a specific document, like a Green Card?
No, that would be discriminatory. You are allowed to choose which acceptable, unexpired documents from the lists you wish to present.
Can AI tools help me fill out Form I-9?
Yes, services like Instafill.ai use AI to accurately auto-fill form fields, which helps save time and prevent common errors when completing the form.
How can I fill out this form online?
You can use a service like Instafill.ai to complete the form digitally. Simply upload the Form I-9 PDF, and the platform will guide you through filling out the required fields online.
The Form I-9 I have is a non-fillable PDF. What can I do?
If you have a flat, non-fillable PDF, Instafill.ai can convert it into an interactive, fillable form. This allows you to easily type your information into the correct fields before printing and signing.
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