Work visas and sponsoring talent in the United States
Reviewed by Mellow Editorial Team, HR & payroll content team
Sponsoring a foreign national to work in the United States means navigating a federal immigration system that is rules-heavy, slow-moving, and unforgiving of administrative errors. Understanding the main visa categories, your obligations as a sponsor, and the realistic timelines involved will help you plan hiring decisions before they become urgent.
The main work visa categories
Most employers encounter a handful of visa types regularly.
H-1B (Specialty Occupation) is the most common route for professional roles requiring at least a bachelor's degree or equivalent in a specific field — engineering, software development, finance, accounting, and similar disciplines. The problem is supply: Congress caps new H-1B visas at 65,000 per year (plus 20,000 for US master's degree holders), and demand typically far exceeds that cap. USCIS runs an annual lottery, generally in March, for an October 1 start date. If your candidate is not selected, you wait another year. For roles where this timeline matters, plan sponsorship well in advance.
L-1 (Intracompany Transferee) applies when you are moving an existing employee from a foreign affiliate, subsidiary, or parent company into the United States. L-1A covers managers and executives; L-1B covers workers with specialized knowledge. The employee must have worked for the related entity abroad for at least one continuous year within the preceding three years. This route bypasses the H-1B lottery entirely.
O-1 (Extraordinary Ability) is for individuals who have reached the top of their field — recognized by awards, publications, significant compensation, or similar evidence. There is no cap, but the evidentiary bar is high and documentation-intensive.
TN (Trade NAFTA/USMCA) is available only to Canadian and Mexican citizens in specific professional categories listed in the USMCA agreement. Processing is relatively fast and there is no annual cap, making this a practical option when the candidate's nationality and occupation qualify.
E-3 is similar in structure to the H-1B but reserved exclusively for Australian nationals. It has its own separate annual cap of 10,500 and is less affected by the lottery backlog.
What sponsorship actually requires from you
Acting as a petitioner means taking on real legal and administrative responsibilities. For most employment-based visas, you must:
- File a petition with USCIS (and in some cases first obtain a labor certification from the Department of Labor, known as PERM)
- Demonstrate that the role is genuine and that the worker will be paid the prevailing wage for the position and location
- Maintain accurate records and notify USCIS of material changes — such as a change in job duties, location, or salary — that could affect the visa's validity
- Cover certain filing fees (for H-1B, the employer is prohibited from passing specific fees to the worker)
The PERM labor certification process — required for most green card employment sponsorship pathways — requires advertising the position to US workers first and documenting that no qualified US worker was available. It adds months to an already long timeline.
Timelines and the green card pipeline
H-1B holders are often on a path toward permanent residence (a green card) through the employment-based (EB) categories. The realistic wait time depends heavily on the worker's country of birth. Workers born in India or China face backlogs measured in decades for certain EB categories due to per-country annual limits — a structural feature of US immigration law that no employer action can shortcut.
For immediate hiring needs, premium processing is available for some visa types and petitions. USCIS currently offers premium processing guarantees of 15 or 45 business days depending on the form, in exchange for an additional fee. Premium processing speeds USCIS's adjudication; it does not accelerate consular processing or state department steps.
Compliance obligations once someone is working
Sponsoring a visa holder creates ongoing compliance requirements beyond the initial petition.
All employers — regardless of whether they sponsor visas — must complete Form I-9 to verify every employee's work authorization. Errors and missing forms carry civil penalties.
H-1B employers must also maintain a Public Access File for each sponsored worker, containing the Labor Condition Application and documentation of the prevailing wage determination. This file must be available for public inspection and DOL audit. Failure to maintain it properly can result in back-pay liability and debarment from the program.
If a sponsored employee is terminated before their visa period ends, there are specific notice and, in some cases, return-transportation obligations. Seek immigration counsel before laying off a visa holder.
Working with contractors and visa holders
Some employers attempt to use independent contractors rather than employees as a way to avoid immigration sponsorship obligations. This generally does not work: most visa categories, including H-1B, require a traditional employer-employee relationship. Misclassifying a visa holder as a contractor creates both immigration and tax exposure.
For companies hiring internationally across multiple countries and needing to understand how payroll integrates with cross-border employment, how Mellow runs payroll across six countries on one platform covers the operational side of that picture.
Immigration counsel is worth the cost at every stage of the sponsorship process. The rules change frequently, the stakes for errors are high, and the specific facts of each case — the worker's status history, the role, the company structure — almost always matter.
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