Employment-based immigration: temporary work visas and work green cards

Temporary work visas: tied to an employer and a job

Most people who work in the United States as foreign nationals start on a temporary, or nonimmigrant, work visa. These are tied to a specific employer and a specific role. The H-1B is the best known, for specialty occupations that normally require at least a bachelor's degree, and it is subject to an annual cap that is heavily oversubscribed, so many H-1B cases run through a lottery. The L-1 lets multinational companies transfer managers, executives, or specialized-knowledge employees from a foreign office. The O-1 is for individuals with extraordinary ability, and the TN is available to certain Canadian and Mexican professionals under the trade agreement.

Because a temporary work visa belongs to the employer-employee relationship, leaving or losing the job has immediate consequences. There is often a short grace period to find a new sponsor or change status, but it is limited. Workers in this position should understand their timeline before a job change, not after, because falling out of status can affect future filings.

Employment-based green cards and the EB categories

Permanent residence through work runs through five preference categories. EB-1 covers people of extraordinary ability, outstanding researchers, and certain multinational executives. EB-2 covers advanced-degree professionals and those with exceptional ability, and includes the National Interest Waiver, which lets some applicants skip the employer and labor-certification requirement when their work benefits the country. EB-3 covers skilled workers, professionals, and certain other workers. EB-4 covers special categories such as some religious workers, and EB-5 is the immigrant-investor category.

For many EB-2 and EB-3 cases, the employer must first obtain a labor certification (often called PERM) from the Department of Labor. That process tests whether qualified U.S. workers are available for the role at the prevailing wage, and only if none are does the case proceed. Like family categories, the employment green cards are capped per year and per country, so applicants from high-demand countries can wait years for a visa to become current under the Visa Bulletin.

Reading the temporary categories: who each one fits

The temporary work visas are not interchangeable, and picking the wrong one wastes time. The H-1B is for a specialty occupation, a role that normally requires at least a bachelor's degree in a specific field, and the worker generally needs that degree or its equivalent. Because demand far exceeds the annual cap, most new H-1B cases run through a registration and lottery, so selection is a real hurdle separate from whether the worker qualifies. The L-1 has no lottery but a narrower fit: it moves an employee who has worked abroad for a related company in a managerial, executive, or specialized-knowledge role into the U.S. arm of that business.

Other categories serve narrower profiles. The O-1 is for a person at the top of their field, who can document sustained recognition rather than just talent. The TN, available to certain Canadian and Mexican citizens under the trade agreement, covers a defined list of professions and is often faster to obtain but tied to that list. There are also seasonal and specialized categories beyond these. The practical first question is never which visa sounds best; it is which one the worker and the job actually fit, because eligibility is defined narrowly and the evidence has to match the category.

The phases of an employment-based green card

A work-based green card usually moves through three phases, and for many people the first two take the longest. For most EB-2 and EB-3 cases the first phase is labor certification, often called PERM: the employer tests the U.S. job market by recruiting for the role at the prevailing wage and, only if no qualified U.S. worker is available, obtains certification from the Department of Labor. The second phase is the immigrant petition, in which the employer (or, for a National Interest Waiver or EB-1A, sometimes the worker) files to establish that the job and the worker meet the category. Approval of that petition sets the priority date.

The third phase is the green card itself, and it can only happen once a visa is available. For an applicant inside the country with a current priority date, that means adjustment of status on Form I-485; for one abroad, consular processing. Applicants from high-demand countries can wait years between the petition and this final step because the EB categories are capped per year and per country under the Visa Bulletin. Every part of this is sensitive to timing, and the published estimates are only estimates that shift with caseload and policy, so confirm current Department of Labor, USCIS, and Department of State guidance rather than relying on a number you saw before.

What an employment case has to prove

Employment cases turn on documented qualifications and a documented job, and the evidence falls into clear buckets. The worker's side usually means degrees, transcripts, and credential evaluations where a foreign degree needs to be matched to a U.S. equivalent, plus letters and records establishing experience and, for higher categories, recognition in the field. The employer's side means proof the company is real and can pay the offered wage, the job description and requirements, and, for PERM cases, the full record of the recruitment that tested the market.

The standard rises with the category. A skilled-worker or professional case under EB-3 is largely about meeting the stated job requirements. An EB-1 extraordinary-ability case or an EB-2 National Interest Waiver asks for a much thicker record, the kind that shows impact, recognition, or national benefit through evidence rather than assertion. Across all of them, consistency matters: the wage on the petition has to match the labor certification, the job duties have to line up with the requirements, and the worker's record has to support the category claimed. Gaps and contradictions are what generate requests for more evidence, and those add months.

Common pitfalls in work-based cases

The most damaging mistakes are about status and timing rather than qualifications. Letting a temporary status lapse between filings, or working before the right authorization is in place, can break a carefully built sequence and jeopardize a pending green card. Changing jobs at the wrong moment can also matter, because a green card tied to a specific employer and role assumes that job still exists; some flexibility exists once a case is far enough along, but the rules are specific and easy to get wrong. Missing the short grace period after losing a job is another frequent and avoidable problem.

On the employer side, a thin or inconsistent PERM recruitment record, a wage below the prevailing level, or a job description that does not match the worker's actual qualifications can sink an otherwise good case. Denials and delays also follow from credential gaps, such as a foreign degree that was never properly evaluated for U.S. equivalence, or from evidence that asserts rather than shows what the category demands. Because the employer drives much of the process and carries real legal obligations on wages and recordkeeping, employment cases reward early planning and coordination between the worker and the company, ideally with an attorney who handles business immigration.

How an employment green card differs from a family one

The two systems share the Visa Bulletin and the adjustment-versus-consular choice, but almost everything else differs. A family green card rests on a qualifying relationship and, for immediate relatives of citizens, skips the visa-availability wait entirely; an employment green card rests on a job, usually requires a sponsoring employer, and for many categories cannot even begin until the employer completes labor certification. The financial backbone differs too: a family case turns on a sponsor's binding Affidavit of Support, while an employment case turns on the employer's ability to pay the offered wage and the worker's qualifications.

These paths frequently touch the same person. A worker on an H-1B might later marry a citizen and move to a family path, or pursue both an employer-sponsored green card and a family petition and use whichever becomes available first. Because the eligibility, evidence, and timing are different on each track, and because the order in which steps happen can affect status, it is worth understanding both before committing. Our family-based-visas guide explains the relationship side in the same plain terms.