An H-1B client letter can support a petition by explaining the real work a beneficiary will perform at a third-party site. It should provide facts the client can verify, not generic assurances that someone is a “specialty professional.” Its role depends on the evidence and current regulatory requirements; there is no universal magic wording.
Explain the actual assignment
Useful details include the client’s identity, project or business need, specific duties, expected assignment dates, work location, and the educational requirements for the actual position. The petition must establish the applicable H-1B requirements, including a bona fide specialty-occupation position under the governing rule. [1]
Describe duties concretely. “Works on software” is less useful than explaining the systems, problems, responsibilities, and knowledge required. A degree list should be connected to the duties rather than copied from unrelated positions.
Keep the evidence consistent
The letter should agree with the petition, contracts or work orders, job description, and applicable labor condition application. The LCA has its own requirements concerning the occupation, work locations, wage obligations, and other attestations. A client letter does not replace the certified LCA. [2]
For example, a letter identifying a different worksite or materially different duties from the filed petition can create questions rather than solve them. Explain legitimate changes through the appropriate immigration and labor-compliance process.
What to avoid
- Claiming guaranteed work for dates the client has not committed to.
- Using duties or degree requirements the signer cannot substantiate.
- Confusing the end client’s role with the petitioning employer’s obligations.
- Relying on an old withdrawn memorandum instead of current regulations.
If a client will not provide a letter, assess what other reliable contracts, statements of work, project records, or evidence can establish the facts. Do not fabricate a signature or substitute a template for missing evidence.
Review H-1B versus O-1 eligibility when choosing the underlying classification. changing employers during H-1B processing concerns a separate petition strategy. Keep the final signed letter and supporting records available for a request for evidence or site inquiry, and ensure the beneficiary understands the accurate facts of the assignment.
Primary sources
Sources checked: October 31, 2026.