A client letter for an H-1B petition is a letter written by the end-client company where the H-1B worker will actually sit and perform the job, confirming the duties, worksite, project timeline, reporting structure, and employment relationship in enough detail that USCIS can independently verify what the petitioning employer has claimed. When the beneficiary will be placed at a third-party worksite, this letter is often the most closely read document in the entire filing, and getting it right is the single biggest thing you can do to avoid a Request for Evidence.
The letter is not the same as the petitioner’s own support letter. It comes from the client, prints on the client’s letterhead, and is signed by someone with authority there: a project manager, department head, or HR director. Its job is to give an adjudicator third-party confirmation that real specialty-occupation work exists and that the petitioning employer, not the client, remains the employer.
What the Letter Must Contain
A client letter that survives scrutiny covers a specific set of details. Leaving any of them out is one of the most common reasons petitions draw additional questions.
- A detailed description of the duties the H-1B worker will perform at the client site, written with enough specificity to show the work requires specialized knowledge.
- The physical worksite address, matching the address on the certified Labor Condition Application.
- The expected duration of the assignment, ideally covering the full period requested in the H-1B petition, with a note about renewal or continuation if the project ends earlier.
- The reporting structure: who provides day-to-day project guidance at the client site, and confirmation that the petitioning employer retains authority over management decisions, performance evaluations, and hiring and firing.
- A statement that the position requires at least a bachelor’s degree in a specific field.
- An explicit statement that the H-1B worker is not an employee of the end-client and remains under the petitioning employer’s control.
- Confirmation that the worker will be employed full-time (or a specific number of hours) and paid directly by the petitioning employer.
The more concrete and specific each of these items is, the less room USCIS has to question whether the position is real and whether it genuinely calls for someone with specialized training.
How Specific the Duty Descriptions Need to Be
The backbone of any H-1B petition is establishing that the job is a “specialty occupation,” meaning a position that requires the practical application of highly specialized knowledge and at least a bachelor’s degree in a directly related field as a minimum for entry.1Office of the Law Revision Counsel. 8 USC 1184 – Admission of Nonimmigrants The position also has to satisfy at least one of four regulatory criteria: the degree is normally the minimum entry requirement for the position; the requirement is common in the industry for parallel roles or the position is complex enough that only a degreed individual can perform it; the employer normally requires a degree for the role; or the duties are so specialized that the knowledge required is typically associated with a bachelor’s degree or higher.2eCFR. 8 CFR 214.2 – Special Requirements for Admission, Extension, and Maintenance of Status
The client letter is where those criteria either come to life or fall flat. A letter that says the worker will “analyze data and prepare reports” could describe a job that requires no degree at all. A letter that says the worker will “design predictive models using machine learning algorithms, evaluate model performance through statistical validation techniques, and integrate analytical outputs into the client’s real-time decision systems” makes the specialty-occupation argument almost by itself. The letter should also state the minimum degree in terms of a specific field, not a bachelor’s in anything, and where possible note that comparable positions in the industry require the same level of education.
Matching the Letter to the LCA
One of the most avoidable H-1B mistakes is a mismatch between the client letter and the Labor Condition Application. The LCA locks in specific facts about the position, and the letter has to line up with them.
Worksite Address
The work address in the letter must match the worksite listed on the certified LCA. If the worker will perform services at a location that wasn’t contemplated when the LCA was filed, the employer must provide notice at the new site on or before the day the worker begins there.3U.S. Department of Labor. Fact Sheet 62M – What Are an H-1B Employers Notification Requirements A location outside the original area of intended employment generally requires a new LCA and an amended H-1B petition.
Duties and Occupational Classification
The LCA is tied to a Standard Occupational Classification code, which drives the prevailing wage. The duties in the client letter must correspond to that code. If the letter describes work that falls under a different occupation, the wage foundation of the petition is undermined and the Department of Labor may require correction or back payment on audit.
Wage
The employer must pay at least the prevailing wage or the actual wage paid to similarly employed workers, whichever is higher, for the entire period the H-1B worker is employed under the LCA.4eCFR. 20 CFR 655.731 – What Is the First LCA Requirement Any compensation figures the client letter references must be consistent with the LCA. Even where the worker performs duties in a different occupation than the LCA identifies, the wage obligation is based on the occupation on the LCA, not the work actually performed.
Showing the Petitioning Employer Still Controls the Worker
USCIS requires the petitioning employer to show it has the right to control how, when, and where the worker performs the job.5U.S. Citizenship and Immigration Services. Determining Employer-Employee Relationship for Adjudication of H-1B Petitions Third-party placement complicates this, because the worker sits at the client’s office, takes direction from the client’s project managers, and uses the client’s systems. The client letter has to describe meaningful work under the client’s projects while making clear that the petitioner retains ultimate control over the worker’s employment.
Regulators look at whether the employer can hire, pay, fire, supervise, or otherwise control the worker.6U.S. Citizenship and Immigration Services. Questions and Answers – Memoranda on Establishing the Employer-Employee Relationship in H-1B Petitions The letter supports this by stating outright that the worker is not the end-client’s employee and that the petitioning employer retains authority over management decisions. Supporting documents help too: employment contracts specifying supervisory authority, organizational charts placing the worker within the petitioner’s structure, and records of the petitioner’s ongoing involvement in performance reviews and direction.
The January 2025 H-1B modernization rule codified USCIS’s authority to request contracts and agreements between the petitioner and third parties. Submitting those contracts is not mandatory, but the petitioner still has to demonstrate eligibility.7Federal Register. Modernizing H-1B Requirements, Providing Flexibility in the F-1 Program, and Program Improvements A client letter that addresses the relationship head-on reduces the chance USCIS asks for more.
Project and Timeline Details After the 2025 Rule
USCIS still expects to see that specific, non-speculative work exists for the beneficiary. One of the top RFE triggers has long been the petitioner’s failure to establish that qualifying assignments in a specialty occupation are available for the requested period.8U.S. Citizenship and Immigration Services. Understanding Requests for Evidence – A Breakdown of Why RFEs Were Issued for H-1B Petitions
The 2025 modernization rule loosened this. Petitioners no longer need to establish non-speculative day-to-day assignments for the entire petition period; instead, the petitioner has to show that a bona fide position in a specialty occupation exists as of the requested start date.7Federal Register. Modernizing H-1B Requirements, Providing Flexibility in the F-1 Program, and Program Improvements That is a real relaxation for consulting and staffing employers, but it doesn’t lower the bar on detail. A strong client letter still spells out the project scope, the deliverables the worker is responsible for, the start and expected end dates, and a short explanation connecting the technical demands of the project to the worker’s qualifications. Letters that read like real project descriptions written by someone who understands the work are credible. Boilerplate is not.
Mistakes That Trigger RFEs
USCIS filing tips identify a familiar set of problems with client letters:9U.S. Citizenship and Immigration Services. H-1B Filing Tips and Understanding Requests for Evidence
- No client letter at all in a third-party placement filing. USCIS needs the independent confirmation, and its absence is the fastest route to an RFE.
- Generic duty descriptions that could describe any entry-level job. These fail to establish the specialty occupation.
- A project window shorter than the petition period with no explanation of what happens next.
- Missing or inconsistent worksite details. A location that does not match the LCA is an inconsistency adjudicators catch immediately.
- Silence on who controls the worker. If the letter doesn’t clarify the employment relationship, USCIS will ask.
Responding to an RFE costs time and money, and approval rates after an RFE are lower than for petitions approved on initial filing. The best letters are drafted collaboratively between the petitioning employer’s immigration counsel and someone at the client who actually knows the project, so the technical detail is genuine rather than reverse-engineered from a job posting.
Keeping the Letter Accurate After Approval
The client letter is a snapshot of the arrangement at the time of filing. If the arrangement changes materially after approval, an amended petition may be required. USCIS treats a material change in the terms and conditions of employment, including a change in place of employment to a geographic area requiring a new LCA, as an amendment trigger.10U.S. Citizenship and Immigration Services. Final Guidance on When to File an Amended or New H-1B Petition
Not every change requires a new filing. Moving the worker to a new location within the same area of intended employment generally does not require a new LCA or amended petition. Short-term placements of up to 30 days at a different worksite (or 60 days if the worker remains based at the original site) also fall outside the amendment requirement. But a move to a new client, a new city, or fundamentally different duties typically calls for an amended petition with a new client letter reflecting the current arrangement.
What Happens During an FDNS Site Visit
USCIS’s Fraud Detection and National Security Directorate runs unannounced site visits to verify H-1B petitions. Officers confirm the petitioning organization exists, interview personnel about the beneficiary’s work location, physical workspace, hours, salary, and duties, and may speak directly with the H-1B worker.11U.S. Citizenship and Immigration Services. Administrative Site Visit and Verification Program
The client letter becomes the benchmark during that visit. If it says the worker performs data analysis for the client’s risk management team and the site visit finds the worker doing basic IT support, the inconsistency is a serious problem. Both companies should keep the letter on file and make sure the on-site supervisor knows in general terms what was represented to USCIS. Officers may also ask for documentation beyond what was originally submitted, so organized records of the work arrangement, project documentation, and supervisory communications are worth having ready.