TN Visa Employer Support Letter: What It Must Say to Get Approved

The TN employer support letter is not a standard offer letter. It is a legal document that serves as the primary evidence of both the job offer and the applicant's eligibility. CBP officers at the border and USCIS adjudicators reviewing I-129 petitions use this letter to determine whether the applicant qualifies for the claimed TN profession.

A generic HR offer letter that says "we're pleased to offer you the position of Senior Software Engineer" will get you denied. Here's what the letter actually needs to contain.

Why the Letter Is So Critical

For Canadians, the employer support letter functions as the entire petition. Unlike the H-1B, there's no USCIS petition package, no Labor Condition Application, no PERM filing. The letter is what the officer has in front of them when deciding whether to approve or deny your TN status.

For USCIS I-129 filings, the letter accompanies the petition and is the officer's primary source of information about the job duties and how they fit the USMCA profession definition.

Getting the letter right is the single highest-leverage thing you can do to improve your approval odds.

Required Elements Under 8 CFR 214.6

The letter must include:

1. Company letterhead Official letterhead with the U.S. employer's name, address, and contact information. The employer must be a legitimate U.S. entity — foreign parent companies or shell entities face additional scrutiny.

2. The applicant's full legal name as it appears on their passport.

3. The specific USMCA profession category Not your job title. The exact profession name from the USMCA list: "Computer Systems Analyst," "Engineer," "Management Consultant," "Accountant," etc. The letter should explicitly state: "We are writing in support of [Name]'s application for TN nonimmigrant status as a [USMCA Profession]."

4. A detailed description of job duties This is the most important element and the most commonly botched. The duty description must:

• Be specific (not generic task lists)
• Use language that maps to the DOL Occupational Outlook Handbook definition of the claimed profession
• Make clear that the primary duties are professional-level work consistent with the USMCA category
• Be at least 150–250 words to adequately describe the role

5. A description of how the applicant's qualifications meet the profession's requirements For a degree-based category: "Ms. [Name] holds a Bachelor of Science in [Field] from [University], which provides the theoretical knowledge required for this position." For an experience-based category (Management Consultant): specific years and types of experience.

6. Salary and compensation details The salary or hourly rate, and a general description of benefits if applicable.

7. Duration of the position A specific start date and end date (maximum three years). "Indefinite" or "permanent" are the wrong answers here. The letter must frame the engagement as temporary, with a defined term.

8. Statement of temporary intent Language explicitly affirming that the position is temporary and that the employee is expected to depart the U.S. at the end of the authorized period. Example: "This position is temporary in nature. [Name] will be admitted on a temporary basis and is expected to depart the United States upon completion of the assignment or at the expiration of authorized status."

9. Authorized signature Signed by an appropriate company representative — typically HR director, VP, or general counsel. A direct manager signature works but is weaker. The signatory should have apparent authority to speak for the company on employment matters.

What Gets Letters Rejected

Vague duty language. "Will perform various engineering functions" or "will be responsible for software development tasks" are not adequate. Officers are specifically looking for duty descriptions that match the regulatory definition of the claimed profession.

Manager-heavy framing. "Will manage a team of 8 developers and oversee project delivery" describes a manager, not a professional. TN is for professionals. Managerial duties can be mentioned as incidental, but they can't be the primary framing.

Inconsistent profession title. Using "Technical Lead" or "Principal Architect" as the position title when applying as an "Engineer" causes officers to question why the company's own title doesn't match the visa category being claimed.

No statement of temporariness. Forgetting to include language about the temporary nature of the position is a common oversight. CBP officers notice its absence.

Generic templates from HR. Many U.S. employers have never sponsored a TN before and default to their standard offer letter format. The applicant often needs to provide a draft for the employer to review and sign — this is normal, not inappropriate. The employer doesn't know TN requirements; you do.

What Good Duty Language Looks Like

For a Computer Systems Analyst application, instead of:

"Will develop and maintain software systems for the company's product suite."

Write:

"Will conduct technical requirements analysis for enterprise systems by interviewing business stakeholders and translating business objectives into system specification documents. Will evaluate current system architectures, identify performance bottlenecks, and design technical solutions to address business needs. Will produce system design documentation, data flow diagrams, and technical feasibility assessments. Will coordinate with development teams to ensure implementation aligns with approved system specifications. Will conduct post-implementation reviews to assess system performance against requirements."

The second version describes an analyst. The first describes a developer. CBP will approve the second. The first risks denial.

Who Should Draft the Letter

The applicant should draft the letter and the employer should review, modify as needed, and sign it. This is standard practice — HR departments typically don't know TN requirements and will write generic letters without guidance.

Provide your employer with:

1. A draft of the letter meeting all TN requirements
2. A brief explanation of what a TN visa is and why the specific elements are required
3. The regulatory reference (8 CFR 214.6) if your HR department wants to verify

Most employers are willing to sign a compliant letter when it's explained that this is required for you to work for them legally.

The US TN Visa (USMCA) Guide includes a complete employer letter template with profession-specific duty language for 15 common TN categories — formatted for your employer to customize and sign.