Last reviewed September 6, 2026
Overview: Temporary employment routes differ by the job, nationality, qualifications, employer and purpose. Most authorize specific employment rather than permission to take any U.S. job. The actual duties, worker’s background and sponsor determine which requirements apply.
How jobs and qualifications relate to the categories
H-1B concerns specialty occupations requiring related degree-level knowledge. E-3 is a separate specialty-occupation category for Australian citizens, and H-1B1 applies to qualifying Chilean and Singaporean citizens. TN covers qualifying Canadian and Mexican professionals only when the occupation and credentials match its list.
L-1 concerns qualifying transfers from related overseas businesses. O-1 concerns qualifying extraordinary ability or achievement. Experience alone does not make these categories interchangeable.
Temporary agricultural jobs use H-2A, while qualifying temporary nonagricultural needs use H-2B. The employer must demonstrate the required temporary need; a short contract is not enough by itself.
P and O can cover different athletic or performance activities under distinct standards. Structured training may fit H-3, cultural exchange Q-1, and qualifying religious employment R-1. Each has its own program requirements.
The sequence of approvals
- The job, employer, location, dates and worker’s qualifications establish the basis for the case.
- Some categories require a labor-market stage. An LCA and temporary labor certification are different processes.
- An employer petition follows where required. Some treaty-based consular routes do not require advance USCIS petition approval.
- Visa processing abroad or an eligible in-country status request follows the relevant procedure.
- Employment can begin only under an applicable authorization and its effective dates. The I-94 records admission or an approved status period.
Registration, certification, petition, visa and admission are separate decisions. An employer’s target start date does not override them.
Caps, duration, family and job changes
Annual caps, maximum stays, extensions and rules after job loss differ by category. Dependent status does not universally authorize a spouse to work.
Changing employers can require a new petition, LCA or admission. H-1B and eligible H-2 portability rules are not a universal rule for all workers. A grace period after job loss may allow time for another lawful step but does not itself authorize any new job.
Costs and longer-term plans
Fee-payment responsibilities differ by category. Some employer obligations cannot lawfully be shifted to the worker. Paying a recruiter does not purchase government approval.
Temporary employment and permanent residence are separate processes. H-1B and L-1 permit dual intent, while other categories have different intent rules. An approved immigrant petition does not automatically extend the employment status or permit unrestricted employment.