The United States does not hand every foreign worker one national work-permit card they apply for alone. For many employer-sponsored temporary jobs, the employer petitions U.S. Citizenship and Immigration Services (USCIS) so you can work for that petitioning company in a named classification. Broader first-permission context sits in how to apply for US residence permission. Card-based Employment Authorization Document (EAD) categories are a different track; see how to apply for work authorization for Form I-765 detail rather than repeating it here.
How does employer-sponsored temporary work actually start?
For H-1B specialty occupations, the employer (or agent) first obtains a certified Labor Condition Application (LCA), Form ETA-9035/9035E, from the U.S. Department of Labor. The LCA locks in worksite, wage, and prevailing-wage attestations. Cap-subject H-1B cases also need a successful USCIS electronic registration before the petition window. Cap-exempt employers (certain universities and research organizations) and many extensions, amendments, or transfers of people already in H-1B status follow different timing rules.
With a certified LCA (when required), the employer files Form I-129 with the H classification supplements, fees, and evidence that the role is a specialty occupation. After approval, workers abroad usually apply for an H-1B visa stamp and admission. People already in the United States may request a change or extension of status on the same petition when eligible. L-1 intracompany transfers also use Form I-129, but the evidence focuses on a qualifying parent, branch, affiliate, or subsidiary relationship and at least one continuous year of qualifying employment abroad in the prior three years, not an H-1B-style LCA.
Other temporary petition classes (for example O-1 extraordinary ability) likewise ride on employer or agent Form I-129 filings. You cannot invent a petition without a qualifying US petitioner.
When is an EAD path the better mental model?
Some people are authorized to work only after USCIS approves an EAD, not because Form I-129 put them in a principal worker classification tied to one employer. Asylum-related categories, many adjustment-of-status applicants, certain student practical-training cases, and some dependent spouses fall in that bucket. Filing Form I-765 and waiting for the card is the process for those categories. Do not file I-765 just because a friend on H-1B never needed one. Principals in H-1B, L-1, or similar classes are usually employment-authorized incident to that status for the petitioning employer and show passport, I-94, and approval evidence for Form I-9 instead.
Dependents (H-4, L-2, and similar) follow different rules than the principal. Some may need an EAD; some may have incident-to-status options when USCIS recognizes them. Always match the category instructions rather than copying the principal’s paperwork.
After any approval path, hiring still runs through Form I-9, and payroll usually needs a Social Security number. See how to complete Form I-9 and how to get an SSN. Keep your I-94 record consistent with the petitioned status.
Common misconceptions
A US job offer is not a work permit by itself. Without an approved petition (or a separate EAD category that actually applies), the offer cannot authorize employment.
An LCA is not permission to start work. It is a DOL attestation step that supports many H-1B petitions; USCIS approval and lawful admission or status still matter.
Summary
Treat employer-sponsored temporary work as an employer-driven Form I-129 process, with an LCA for most H-1B specialty cases and qualifying-relationship evidence for L-1 transfers. Use the EAD and Form I-765 track only when your category requires that card, and keep that detail on the work-authorization page.
Once status is approved, finish I-9, SSN, and I-94 housekeeping so the job can start legally for that employer.
Sources
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