Work Authorization in the US: What Every Employer Needs to Know

Can you legally put this person on your payroll on Monday? That one question sits behind every offer letter a US employer signs, and getting it wrong invites fines, forced terminations, and lost talent. Work authorization is the legal permission that decides who you can hire, how quickly, and at what level of risk.

This guide explains what work authorization is, who needs it, the main visa and document types, and exactly how US employers verify and maintain it in 2026. Start with the definition.

What is work authorization, and why does it matter to employers?

Work authorization is the legal permission a government grants that lets a person work in a specific country. In the US, citizens and lawful permanent residents (green card holders) are authorized to work automatically.

Everyone else, from an H-1B engineer to an international graduate, must secure permission through a visa, a green card, or an Employment Authorization Document (EAD) before they can be paid for work.

Each fiscal year, roughly 140,000 employment-based immigrant visas are available to qualified applicants under US law, a reminder that authorized hiring runs on limited, regulated pathways.

It matters because the employer, not just the worker, carries the legal duty to confirm it. Hire someone who is not authorized and you can face civil penalties, criminal exposure in willful cases, and the sudden loss of an employee mid-project.

Some hires also need employer visa sponsorship to become authorized in the first place, which adds cost and time to the offer.

Before you can verify anyone, you need to know who actually requires authorization.

Who needs work authorization to work in the US?

Anyone who is not a US citizen or lawful permanent resident generally needs work authorization to be employed in the US. That covers most foreign nationals, whether they are hired directly as employees or engaged as international contractors.

The people who most commonly need work authorization include:

• Foreign professionals and specialty workers on employer-sponsored visas
• International students working during or after their studies (OPT and CPT)
• Refugees and people granted asylum
• Temporary and seasonal workers in approved categories
• Spouses and dependents of certain visa holders
• Individuals with extraordinary ability in their field

The common thread is simple: if a worker is not a citizen or green card holder, assume authorization is required until a document proves otherwise. That is also why how you classify each worker matters as much as which visa they hold.

For the bigger picture, our guide to hiring international employees walks through the employer side of the process.

It also helps to know when someone is genuinely self-employed rather than your employee, because that line changes both authorization and tax duties.

People often use two terms interchangeably here, so it helps to separate them.

What is the difference between work authorization and a work permit?

Work authorization is the broad legal right to work; a work permit is one specific form of that right. In the US, the most common work permit is the Employment Authorization Document (EAD), a card issued by USCIS that proves someone can work while they hold a qualifying status or wait on a pending application.

Put simply, all work permits are work authorization, but not all work authorization is a work permit. A green card, an H-1B visa tied to an employer, and an EAD are all forms of authorization, yet only some function as standalone permits. The table below sets the two side by side.

Whether the person is a W-2 employee or holds another status, the employer still has to prove authorization the same way.

The next question is which specific authorization types you will actually see on the job.

What are the main types of US work authorization?

US work authorization falls into a few recurring buckets: employer-sponsored nonimmigrant visas, permanent residence, and standalone employment documents. The exact category shapes how long a person can work, whether their authorization ties to one employer, and how you renew it.

These are the types employers meet most often.

Most of these require a job offer and employer involvement, so they affect your hiring timeline directly. For roles you fill with non-employees instead, the rules shift toward 1099 contractors and their own tax paperwork.

Whatever type applies, the employer proves it the same way: through the documents on Form I-9.

What documents prove work authorization on Form I-9?

On Form I-9, a worker proves authorization with either one List A document (identity and work authorization together) or a combination of one List B document (identity) and one List C document (work authorization). The employer examines the originals and records them.

The acceptable documents fall into three lists:

• List A (identity and authorization together): a US passport, a Permanent Resident Card (green card), or a foreign passport with an I-551 stamp or an EAD.
• List B (identity only): a state driver's license or a government-issued photo ID.
• List C (authorization only): a Social Security card without work restrictions, or a US birth certificate.

Students on OPT or CPT usually pair an EAD or an I-20 with these, and minors have limited alternatives. Collecting the right documents is part of a clean onboarding process for any new hire.

Work authorization is separate from tax setup, but the two happen side by side at onboarding. A new employee also completes a Form W-4 so you can withhold federal income tax correctly.

If you engage foreign contractors instead of employees, the equivalent paperwork is a W-8BEN form rather than an I-9.

Employees, by contrast, receive a pay stub each pay period that documents their withholding and net pay.

The employee-or-contractor split also drives year-end forms, and our W-9 vs W-2 explainer covers which one applies.

Contractors also handle their own taxes for independent contractors, which an employer does not withhold.

Documents alone are not enough. You have to verify them through the right process.

How do US employers verify work authorization?

US employers verify work authorization using two tools: Form I-9, which is mandatory for every new hire, and E-Verify, which is optional for most employers but required for some. Together they confirm that the documents a worker presents are genuine and that the person is eligible to work.

Start with the form no employer can skip.

What is Form I-9 and when must it be completed?

Form I-9 is the federal employment eligibility verification form that every US employer must complete for each employee hired since November 1986. The employee completes Section 1 on or before their first day of work, and the employer completes Section 2 within three business days of the start date after examining the documents in person or through an approved remote process.

You must keep each I-9 on file for three years after the date of hire or one year after employment ends, whichever is later, and produce it if federal inspectors ask. Full instructions live on the USCIS I-9 page.

Attorneys are excellent at the left column. They are not, generally, doing the right column. They don't see your I-9s, they don't update them, and they don't track reverification dates against your HRIS.

That warning, from an I-9 compliance analysis for H-1B employers, captures the most common failure point: nobody owns reverification, so expired authorization slips through.

Form I-9 is the floor. E-Verify is the layer some employers must add on top.

What is E-Verify, and when is it mandatory?

E-Verify is a free, web-based system that checks the information on Form I-9 against Social Security Administration and Department of Homeland Security records. It is voluntary for most private employers, but it is mandatory for federal contractors whose contracts contain the FAR E-Verify clause and for employers in states that require it.

You are generally required to use E-Verify when:

• You hold a federal contract with the FAR E-Verify clause (enroll within 30 days of the award, then verify new hires within 90 days).
• Your state mandates it, often as a condition of holding a business license.
• A court order or legal settlement requires it.

Outside those cases, E-Verify is a choice, though many employers adopt it anyway to reduce the risk of hiring an unauthorized worker.

One caution: using another company's workers does not remove your duties, so understand co-employment before you share a workforce.

Verifying at hire is only half the job. Authorization can expire, and 2026 changed the rules on what happens next.

What happens when a worker's authorization expires?

When work authorization expires, the employer must reverify it on or before the expiration date using Supplement B of Form I-9, and the worker must show current proof. If they cannot, you generally cannot keep employing them until authorization is restored.

Here is the change many employers still miss. For years, filing an EAD renewal on time triggered an automatic extension of up to 540 days that kept the worker authorized while USCIS processed the renewal.

DHS ended that automatic extension for renewal applications filed on or after October 30, 2025. Renewals filed before that date can still carry the extension, but new filings do not, per the Federal Register rule.

The practical effect is that you can no longer assume a pending renewal keeps someone work-authorized. Track every expiration date yourself, because an expired EAD with no valid extension means the person is not authorized to work.

All of this friction has a direct effect on how fast and how cheaply you can hire.

How does work authorization affect hiring speed and cost?

Work authorization directly shapes your hiring timeline, budget, and reach. Sponsored visas can take months and cost thousands in filings and legal fees, which slows offers and can price out smaller employers competing for the same talent.

Across our work helping companies hire globally, the impact tends to show up in four ways:

• Timeline: petitions and approvals can add weeks or months before a start date.
• Cost: government fees, premium processing, and legal support raise the true cost of a hire. Premium processing guarantees a decision within 15 calendar days on many petitions for an added government fee.
• Reach: strict categories and annual caps (such as the H-1B lottery) limit who you can hire and when.
• Compliance risk: every authorized hire still needs correct I-9s, timely reverification, and clean records.

For many US companies, the takeaway is that sponsoring and tracking authorization in-house is slow, while hiring the same skills through a partner that already employs talent abroad is faster and lower-risk.

Authorization is also a global mobility question whenever you move existing staff across borders.

If your plan is to grow abroad, tie it to a clear global expansion strategy rather than a run of one-off hires.

And once people are on board, paying international employees compliantly is a discipline of its own.

Headcount math matters too, since your full-time equivalent (FTE) count affects benefits and reporting obligations.

How can Wisemonk help you hire and stay compliant?

Wisemonk is an India-native Employer of Record. We take on the legal employment, payroll, benefits, and compliance for your team, so work authorization, tax forms, and records are handled correctly from day one instead of becoming your problem.

Here is how we help employers hire without the authorization and compliance headache:

• We act as the legal employer through our Employer of Record service, so you get the worker without owning the entity or the filings.
• We run compliant onboarding, contracts, and employer payroll taxes so nothing slips at hire.
• We classify workers correctly, avoiding the contractors vs employees mistakes that trigger penalties.
• Need non-employees instead? Our Contractor of Record service pays and documents contractors compliantly.
• We build and administer competitive employee benefits packages as part of the employment relationship.
• We handle the extras too, including fringe benefits that help you attract and keep people.
• We draft compliant employment contracts for every hire, with the right protections built in.
• We administer time off, including leave of absence handling, so managers do not have to.
• When a role ends, we manage a clean exit and help you terminate an employee correctly.
• If you are weighing models, we break down how an Employer of Record works end to end.
• Need to fill roles fast? We can layer in recruitment process outsourcing alongside employment.

Costs are transparent and listed on our pricing page, with no surprise fees layered on later.

This is not theory. Here is a client's experience in their own words.

The Wisemonk team played a key role in helping us hire for specialized B2B SaaS marketing skills. We were able to build the team within four months, and hire experienced professionals from Tier 1/major B2B SaaS brands... They are a great partner providing integrated services for EOR and recruitment/hiring and I'd recommend them to any B2B SaaS vendor. - Saurabh Sharma, Chief Marketing Officer at OneReach. Read the full OneReach.ai case study for the details.

We have built a strong India EOR practice. We handle employment contracts, payroll, PF, ESI, gratuity, and state-level compliance ourselves, and we are planning to move into future markets including the US and the UK.