Your company may find the exact engineer, accountant, scientist, or designer it needs just across the border. The hiring challenge is not only finding that person. It is making sure the job, the professional’s credentials, the employer letter, the payroll setup, and the worker’s immigration status all describe the same arrangement.
For eligible citizens of Canada and Mexico, the TN nonimmigrant classification can provide a practical route to temporary professional employment in the United States. It is not a general work permit, a shortcut around every employment visa, or permission to run a business from the United States. It is a narrow classification with a potentially simpler process when the position fits the rules.
This guide explains what a small business should evaluate before making an offer, what documents to prepare, and how to build an accounting and recordkeeping process that survives an extension or an audit.
What the TN classification does
TN stands for Trade NAFTA, the designation retained after the United States-Mexico-Canada Agreement replaced NAFTA. It allows qualifying Canadian and Mexican citizens to enter the United States temporarily for prearranged professional-level business activities for a U.S. or foreign employer.
The category is significant because it is not subject to an annual numerical cap. By comparison, cap-subject H-1B cases can involve an annual limit and a random selection process. That difference can matter to a small employer planning a hire around a product launch or client contract rather than around an immigration lottery calendar.
The latest detailed Office of Homeland Security Statistics report available for this guide counted 1,204,910 TN I-94 admissions in fiscal year 2023, or 1.8% of all I-94 nonimmigrant admissions. That number counts admissions, not unique people or approvals, so it is a measure of travel and entry activity rather than a headcount of the TN workforce.
TN still has important limits. The worker must be a citizen of Canada or Mexico, not merely a permanent resident. The profession must appear on the USMCA list, the U.S. position must require that professional capacity, and the worker must meet the education, license, or experience standard for that profession. Self-employment is not permitted.
A qualifying TN admission can last for up to three years. There is no stated total maximum period for a person who continues to qualify, but TN remains a temporary nonimmigrant classification and each period of employment must be properly documented and authorized.
The four-part eligibility test
Treat the classification as a four-way match. A strong candidate with the wrong position is not enough, and a well-written employer letter cannot repair an occupation that does not fit the list.
1. Citizenship
The candidate must hold Canadian or Mexican citizenship. A Canadian or Mexican permanent resident cannot use TN classification simply because they live in one of those countries.
The application path differs by nationality:
| Candidate | Typical initial path | Key practical detail |
|---|---|---|
| Canadian citizen | Request TN classification when seeking admission at an appropriate U.S. port of entry or preclearance location; a visa is generally not required | Carry proof of citizenship, the employer letter, and credential evidence |
| Mexican citizen | Apply for a TN visa at a U.S. embassy or consulate, then seek admission | Plan for the DS-160, interview, passport, employer letter, and supporting credentials |
The worker’s nationality also affects dependents. Spouses and unmarried children under 21 may qualify for TD status, but TD dependents are not authorized to work in the United States merely because the principal worker has TN status.
2. A profession on the USMCA list
The list includes professions such as accountant, engineer, lawyer, pharmacist, scientist, teacher, graphic designer, and management consultant. The list is not a menu of job titles that an employer can select at will. The role’s actual duties must fit the professional category.
For example, calling a general operations role “engineer” in a letter does not make it an engineering position. Start with the work the person will actually perform, identify the closest listed profession, and then verify the profession-specific credential rule under the USMCA appendix and the applicable regulation.
3. A qualifying U.S. position
The position must require a professional-level worker and be prearranged with an employer. Full-time and part-time arrangements can qualify. A letter should explain the business activity, day-to-day responsibilities, work location, anticipated length of stay, compensation, and the relationship between the duties and the listed profession.
This is where small businesses should slow down. A vague letter creates uncertainty at the border or during adjudication. A job description copied from a recruiting page may list every possible duty but establish none of the specific professional work the candidate will perform. Write the letter for the actual position, not for a generic title.
4. The right credentials
Most listed professions require a bachelor’s degree or equivalent professional credential, but the rule varies by occupation. In some categories, a license may qualify; in others, a degree is required and work experience cannot replace it. Foreign degrees may require a credentials evaluation.
Ask for the evidence early:
- Passport or other proof of citizenship
- Degree, diploma, transcript, license, or professional certificate as applicable
- Credentials evaluation when the education or institution makes one appropriate
- Letters from former employers when experience is part of the standard
- State or federal license evidence when the work will require licensing after arrival
Do not assume that a worker’s impressive background automatically satisfies the TN requirement. Match the evidence to the listed profession’s rule and to the duties in the offer letter.
Build the employer support letter like an operating document
The support letter is more than a welcome letter. It is the document that connects your business need, the candidate’s qualifications, and the temporary assignment. It should be consistent with the employment agreement, payroll records, and the work the person will actually perform.
Include, at minimum:
- The employer’s legal name, address, business description, and contact information.
- The candidate’s name and the professional category being requested.
- The purpose of entry and a clear description of the anticipated activities and responsibilities.
- The expected start date, work location, full-time or part-time schedule, and anticipated length of stay.
- The salary, payment method, and any benefits or other remuneration.
- The candidate’s education, licenses, and other credentials relevant to the category.
- The employer’s statement that the role is prearranged and temporary.
- Any evidence needed to show compliance with applicable DHS or state requirements.
The State Department specifically identifies the employer contract or letter, qualification evidence, and compensation arrangements as core documentation. USCIS’s 2025 policy update also clarified several TN eligibility and filing issues, including education, licensing, and the Scientific Technician or Technologist category. Because agencies can update procedures and consulates can publish local instructions, check the current government pages before the candidate travels.
Hiring workflow for a small business
Before making the offer
Write the job description, identify the likely USMCA profession, and compare each required credential with the candidate’s documents. At this point, ask an immigration attorney to review the classification if the role combines categories, includes unusual duties, or involves a regulated license.
Also decide which entity is actually hiring. The employer named in the support letter, the employment agreement, payroll account, and immigration filing should align. A parent company, staffing firm, client, or affiliate can create a different analysis from the one suggested by a simple offer letter.
Prepare the package
Give the candidate a signed support letter and assemble the company documents that demonstrate a real position. Depending on the route and the worker’s circumstances, the package may include an employment agreement, company information, project or client evidence, organizational materials, and proof of the candidate’s credentials.
Canadian citizens commonly present their request at a designated port of entry or preclearance location. Mexican citizens generally need a TN visa interview first. An employer may also use Form I-129 in eligible circumstances, including certain requests for a change, extension, or employer addition while the worker is in the United States.
Do not treat a receipt, an appointment, or a draft letter as work authorization. The worker should begin the U.S. job only after the appropriate TN status or authorization is granted and the admission record supports the employment.
On arrival and during employment
Save the electronic Form I-94 and the authorized end date. The I-94 controls the worker’s authorized stay, not the expiration date of a passport or the date on an internal HR spreadsheet. Put renewal planning on a calendar several months before the end date.
TN status is tied to approved employment. A worker can change employers or add an employer, but the new employment must be properly authorized. USCIS guidance says employment with a different or additional employer is not authorized until the relevant Form I-129 is approved; a new application route through a port of entry may also be available in the circumstances described by the agencies. Never let a worker start the new role while the company is still assuming approval is likely.
If the job changes substantially, pause and review the classification. A promotion, new location, new client assignment, altered duties, or a move from employee to contractor can change the facts that supported the original request.
Payroll and bookkeeping controls that make compliance easier
Immigration paperwork and accounting are connected by the facts they record. If the support letter says one salary and the payroll register shows another with no explanation, a reviewer has to reconcile the difference. If the letter describes engineering work but project records show only sales administration, the business has a documentation problem even if every payroll tax was filed on time.
Create a dedicated employee or project record that links:
- The signed support letter and employment agreement
- The worker’s I-94, visa information when applicable, and approval notices
- Start date, authorized end date, employer, job title, and work location
- Gross wages, bonuses, benefits, reimbursements, and employer payroll taxes
- The projects, clients, or departments receiving the worker’s time
- Renewal dates and the owner responsible for the review
Track immigration and legal costs in their own expense accounts rather than burying them in general office expense. Separate employee travel, filing fees, attorney invoices, credential evaluations, and reimbursed costs so you can explain what the business paid and why. The tax treatment of individual costs can vary, so have your tax professional review the accounts and reimbursement policy.
For a small business, a plain-text ledger can make this evidence easy to inspect. You can keep the employee’s accounting dimensions, payment references, and document links in a version-controlled workflow, then review the resulting spending by person, project, or department in a dashboard such as Fava. The goal is not to put confidential immigration documents into a public ledger. Keep sensitive files in an access-controlled document system and link to them only where your security policy allows.
Common mistakes to avoid
Treating TN as a general-purpose work permit
TN is limited to listed professions, qualifying citizens, prearranged professional work, and temporary entry. It does not authorize unrelated freelance work, a side business, or self-employment.
Matching the title instead of the duties
Immigration reviewers look at the actual professional activities. A title that sounds technical will not fix a position whose responsibilities do not require the claimed profession.
Assuming a degree always substitutes for experience
Credential rules are profession-specific. Where a bachelor’s degree is required, experience may not substitute for it. Read the exact standard for the selected category.
Forgetting the employer-change rule
A TN worker cannot necessarily move to a new employer simply because the worker already has TN status. The new employment needs its own authorization path.
Letting records drift after approval
Update the support file when the worker’s pay, duties, location, employer entity, or end date changes. Keep payroll, HR, immigration, and project systems synchronized.
A practical pre-start checklist
Before the first day, confirm that:
- The worker is a Canadian or Mexican citizen.
- The profession and actual duties fit the current USMCA list.
- The credentials satisfy that profession’s education, experience, and licensing rules.
- The employer letter states duties, compensation, location, and expected duration consistently.
- The correct Canadian or Mexican application route is planned.
- The employee has the required status and a current I-94 before starting U.S. work.
- Payroll is configured for the correct employer entity and work location.
- Immigration, legal, travel, and reimbursement costs have clear ledger accounts.
- One owner has a renewal and record-retention calendar.
This is a planning checklist, not individualized immigration or tax advice. A qualified immigration attorney should review a case when the job duties, corporate structure, credentials, or travel history are not straightforward.
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