I-9 Form: How contractors can stay compliant

Hiring a crew you can trust is one job. Documenting that crew correctly is another, and the consequences for getting it wrong have gotten sharper. Failing to comply with U.S. Citizenship and Immigration Services (USCIS) rules could lead to serious fines. USCIS and ICE have both stepped up worksite enforcement, and construction sites are squarely in the audit pool.

Under federal law, all U.S. companies must verify the identity and right to work of every employee they hire by completing Form I-9. The USCIS requires both employees and employers to fill out this form and present documents that prove identity and employment authorization.

This guide explains what the Form I-9 is and what contractors need to do to complete it. It also identifies some common work authorization mistakes to avoid.

Form I-9 basics for construction companies

What is Form I-9?

Form I-9, Employment Eligibility Verification, is a federally-mandated document required for every employee hired in the United States. The form verifies both identity and employment authorization.

For construction companies, what makes I-9 compliance particularly challenging is the combination of:

• Distributed workforces across multiple job sites
• Seasonal hiring patterns
• High turnover rates
• Complex subcontractor relationships
• Varied state and municipal requirements for public works projects

Who needs to complete Form I-9?

U.S. employers need to verify identity and eligibility for every employee they hire, including U.S. citizens and noncitizens. 

The same form applies regardless of whether an employee is seasonal, part-time, or full-time. The law provides no exemptions for short-term projects, so even if a worker joined a construction crew for a day, the company would still have to document their eligibility.

Key deadlines

Companies must adhere to strict timelines:

• Section 1: Must be completed by the employee on or before their first day of work
• Section 2: Must be completed by the employer within 3 business days of the employee’s first day
• Reverification: Must be completed before work authorization expires
• Retention: Forms must be kept for 3 years after hire date or 1 year after termination, whichever is later

Cost of non-compliance

The financial impact of I-9 violations in construction can be severe:

• Fines ranging from $281 to $2,789 per individual violation
• Project delays due to workforce disruptions
• Potential debarment from government contracts
• Reputational damage that can affect bidding opportunities
  

The fines hurt, but the operational damage usually hurts more. When a significant portion of your workforce is suddenly unavailable, project timelines suffer, client relationships deteriorate, and profitability plummets.

Unique I-9 challenges in construction

Managing compliance across multiple job sites

Unlike companies in industries where employees work at a single location, construction companies face the challenge of distributed workforces:

• Supers and foremen often handle hiring at remote sites without proper training
• Paper documents travel between job sites and corporate offices, increasing the risk of being lost
• Consistency in verification processes varies between different project managers
• Remote locations may have limited connectivity for digital verification systems
  

Implementing a mobile-friendly verification system that allows for secure document collection at job sites while maintaining centralized oversight can help contractors overcome these challenges.

Handling state-specific E-Verify requirements

Construction companies operating across multiple states face a complex patchwork of E-Verify mandates:

• As of 2026, 22 states have implemented E-Verify requirements with varying scopes and penalties
• Some states (Alabama, Arizona, Florida, Georgia, Mississippi) require E-Verify for nearly all employers
• Other states (Pennsylvania, Indiana, Texas) target requirements specifically at construction companies and government contractors
• Several states impose stricter verification requirements for public works projects than for private construction
• Penalties for non-compliance range from business license suspension to debarment from government contracts
  

For multi-state construction operations, maintaining a consolidated compliance tracking system that accounts for each state’s specific requirements is essential.

Handling seasonal workforce fluctuations

Construction’s seasonal nature creates specific compliance challenges:

• High volume of simultaneous hires during peak seasons stresses verification systems
• Rehiring former employees requires proper tracking of existing documentation
• Temporary workers may have documentation with varying expiration dates
• End-of-season layoffs complicate records retention
  

The most effective approach is to develop separate workflows for new hires versus rehires, combined with automated calendar tracking for employment authorization expiration dates.

High turnover management

The construction industry’s turnover rate (approximately 21.4% annually) creates substantial documentation challenges:

• Tracking proper retention periods for short-term employees
• Maintaining accurate separation records
• Managing incomplete I-9s from employees who quit shortly after hiring
• Preparing for potential audits of former employee documentation
  

Creating a standardized separation protocol that includes I-9 retention status in termination checklists helps maintain compliance even with frequent workforce changes.

Special considerations for union requirements and compliance

For union contractors, additional complexities exist:

• Coordinating with union halls that may pre-screen workers
• Understanding the division of verification responsibilities
• Managing documentation for workers dispatched to a job on short notice
• Ensuring compliance with both union agreements and federal requirements
  

Establishing clear protocols with union representatives about document collection responsibilities and developing expedited verification procedures for rush dispatches helps maintain compliance without delaying critical projects.

Which documents do employers need to complete Form I-9?

Employees have the option of providing their employer with either:

• One set of documents that establishes both identity and employment authorization (List A documents).
• One document from List B (identity) along with one document from List C (work authorization).

Here’s a list of common example documents the USCIS deems suitable. 

List A: Combined identity and work authorization

• A U.S. passport or passport card
• A permanent resident card (Form I-551), also known as a green card, verifying the employee’s immigration status
• A foreign passport with Form I-94 or Form I-94A
• A passport from the Federated States of Micronesia (FSM) or the Republic of the Marshall Islands (RMI) with Form I-94 or I-94A, indicating nonimmigrant admission under the Compact of Free Association
• An employment authorization document (Form I-766)

List B: Identity only

• A driver’s license or state-issued ID card that contains a photograph and descriptive information like legal name and date of birth
• A school ID card that includes a photograph of the student
• A U.S. military card or draft record
• A voter registration card

List C: Work authorization only

• An unrestricted U.S. Social Security card
• A birth certificate (original or a certified copy issued by a U.S. state or municipal authority)
• A U.S. Citizen ID card
• A Department of Homeland Security (DHS) employment authorization document

Note: Contractors should be aware that field workers may present a wider range of acceptable documents than office-based HR teams are used to reviewing. This is especially the case for workers who need to cross state lines or seasonal workers. Employers cannot dictate which documents employees present; they can only verify whether these documents are acceptable.

What are the most common Form I-9 errors?

The following employment eligibility verification errors often trigger audits and penalties:

• Missing the three-day window: If an employer allows a new hire to start work on a jobsite before HR verifies their paperwork, they’re opening themselves up to serious issues if the USCIS carries out an audit. This is one of the most common I-9 form issues for contractors.
• Data entry and spelling mistakes: Spelling and numerical mistakes can lead to records that don’t match federal databases, potentially triggering an audit.
• Accepting invalid documentation: Employers should make sure they only allow in-date documents that the USCIS accepts as valid proof of identity and employment authorization. 
• Requesting too many documents: Companies are not allowed to dictate which specific documents an employee should provide or ask for more proof than the USCIS-required minimum.
• Missing signatures or dates: If the worker, employer, or representative fails to sign and date the form, the USCIS considers it incomplete. Under current enforcement standards, these omissions often trigger immediate fees.
• Failing to verify employment documents: Employers must verify the authenticity of employees’ documents through either a physical or authorized remote inspection.
• Improper rehire documentation in Supplement B: Companies that rehire a returning employee must accurately record the rehire date. Under rules effective from March 16, 2026, U.S. Immigration and Customs Enforcement (ICE) now considers failing to do so a substantive violation, leading to monetary fines.

4 features to look for in construction I-9 management software

Selecting the right I-9 verification technology is critical for construction companies to manage compliance across distributed workforces. Look for platforms offering:

• E-Verify integration: Direct API integration that simplifies the verification process and maintains compliance with state-specific requirements
• Construction-specific features: User roles with different access levels, project-based organization, and batch processing for seasonal hiring spikes
• Enhanced security and compliance: Document authentication tools, automatic form updates when regulations change, and comprehensive audit trails
• Integration capabilities: Connections to existing field time tracking, project management, accounting platforms, and certified payroll systems

The right technology transforms I-9 compliance from a burden into a streamlined process, supporting your workforce and reducing risks.

Simplify I-9 compliance and onboarding with Miter.

According to Deloitte’s 2026 Engineering and Construction Industry Outlook, the industry is facing labor shortages and shifting project demand. As contractors try to fill key roles, they must be vigilant to still comply with their legal obligations. 

The USCIS has also begun carrying out I-9 audits far more frequently than in recent years. This strict enforcement increases the risk for construction companies managing seasonal and rotating crews across multiple jobsites.

Miter bridges the compliance gap by embedding a guided digital workflow directly into onboarding processes. Instead of providing a physical signature or ID scan, employees can complete their documentation on a mobile device before they even step onto a jobsite. This proactive approach allows construction teams to verify documents and submit E-Verify cases within one system, ensuring every employee record is audit-ready from day one. 

By centralizing these tasks within a unified HRIS, contractors reduce the need for manual data entry. Miter’s automated reminders also ensure the business remains compliant and eligible, no matter the project.