CPT authorization letter

This page is part of the OPT and STEM OPT — complete guide cluster. For the downstream risk that full-time CPT use creates for OPT, read CPT vs OPT — which applies to you. For the specific risk profile of Day 1 CPT programs, read Day 1 CPT — risk assessment.

Who this is for

An F-1 student preparing the CPT authorization request and the employer offer letter required for the DSO endorsement on Form I-20.

The controlling source

Primary controlling source: 8 CFR § 214.2(f)(10)(i).

The integral-curriculum test

CPT is authorized only when the practical training is an integral part of an established curriculum. The practical training must satisfy one of two conditions:

• The student receives academic credit for the work.
• The practical training is a required component of the program (an established practicum, internship requirement, or co-op that every student in the program must complete).

"It would be a good experience" is not a qualifying basis. The integral-curriculum tie must be documentable.

What the offer letter must state

The DSO cannot authorize CPT without an offer letter that contains all of the following elements:

• Job title — the specific role, not a generic description.
• Specific duties — the actual tasks, tied to the technical skills of the degree program. A letter that says "general assistant" or "various duties" is insufficient.
• Degree tie — an explicit statement linking the duties to the student's field of study.
• Employer legal name and address — matching the employer's official registration.
• Start and end dates — exact dates, not open-ended. These dates flow directly to the I-20 CPT endorsement and cannot exceed the academic term or the program requirement dates.
• Hours per week — part-time (20 hours or fewer) or full-time. Full-time CPT use has OPT consequences; see CPT vs OPT — which applies to you.
• Worksite — physical address or remote work confirmation.
• Supervisor name and title — the person responsible for the student's day-to-day supervision.

Faculty or program endorsement

Before the DSO can authorize CPT, a faculty member, program director, or academic advisor must confirm:

• The position is in the student's degree field.
• The training is an integral part of the curriculum or a required program component.
• The student is enrolled in (or will enroll in) the associated course or practicum if credit is the basis.

Some schools require a formal faculty approval form. Others accept an email from the advisor. Confirm your school's requirement with the DSO before requesting the offer letter from the employer.

DSO authorization process

Once the offer letter and faculty endorsement are in hand, submit the CPT authorization request to your DSO. The DSO must update SEVIS and issue a new I-20 with the CPT endorsement before the first workday. Do not begin work, accept compensation, or perform services for the employer before the CPT-endorsed I-20 is in your hands.

Timeline

• Before accepting the offer: request exact duty language in the offer letter — do not accept and then try to retrofit the letter.
• Before the first workday: DSO must have endorsed CPT on the I-20.
• At any CPT extension: update the CPT authorization before the old end date; do not continue working on an expired CPT authorization.
• At any change in duties, worksite, or hours: obtain a new or amended offer letter and DSO endorsement before the change takes effect.

Part-time vs full-time CPT and the downstream effect

CPT is authorised in two forms: part-time (20 hours or fewer per week) and full-time (more than 20 hours per week). Part-time CPT during the academic year allows the student to continue a full course load simultaneously. Full-time CPT is common during summer break or when the program requires an internship as a graduation condition. The distinction matters beyond the immediate work schedule: full-time CPT used for 12 months or more at the same education level permanently bars OPT at that level. Part-time CPT does not count toward the 12-month bar. Keep a running tally of full-time CPT weeks across all authorisations at each degree level. The DSO endorsement on the I-20 states whether the authorization is part-time or full-time — keep each I-20 with a CPT endorsement as proof of the type and duration of authorisation used.

DSO discretion and school-specific CPT policies

DSOs have significant discretion in authorising CPT, and each school sets its own internal policies within the 8 CFR framework. Some schools require a minimum number of enrolled credits before they will authorise CPT, while others require the internship course to be registered before the DSO can enter the endorsement in SEVIS. Some programs require CPT to be tied to a specific academic term and will not retroactively authorise work done in a previous term. Check your school's CPT policy before approaching an employer. Some DSOs require a minimum GPA, a specific internship course enrollment, or faculty approval beyond a simple advisor email. Understanding your school's specific CPT procedures before you begin the offer letter process prevents last-minute delays that could cause you to start work without authorisation.

What a well-structured CPT employer letter looks like

A properly structured employer offer letter for CPT authorization includes several specific elements on company letterhead. The letter should state the student's name, job title, and start and end dates with day-level precision. The duties section must list three to five specific technical tasks that connect directly to the student's degree field — for a computer science student, examples include developing database schemas, writing API endpoints in Python, or performing statistical analysis using R. The letter should state the hours per week, the worksite address, the supervisor's name and title, and whether the position is paid or unpaid. The letter must also include a statement confirming the work is directly related to the student's degree program. Finally, the letter should be signed by an authorized representative of the employer, with their printed name and title below the signature. A letter that lacks any of these elements will likely be rejected by the DSO and delay the CPT authorization process.

Travel considerations while on CPT

Travel while on CPT requires the same re-entry documents as standard F-1 travel: a valid passport, a valid F-1 visa stamp (unless eligible for automatic revalidation), an I-20 with a DSO travel signature within the last 12 months, and evidence of ongoing enrollment. Unlike OPT, CPT does not require a separate EAD card — the CPT endorsement on the I-20 is the authorization document. Carry the I-20 with the current CPT endorsement, the employer offer letter, and proof of course enrollment when traveling. If the CPT authorization expires while you are abroad, you may need a new CPT authorization before returning to work. CBP officers may ask about your employment during re-entry — be prepared to explain how the work is integral to your program and that you are maintaining full-time enrollment.

Legal consequences of CPT non-compliance

Operating outside the terms of a CPT authorization has serious consequences that extend beyond the immediate employment period. If you begin work before the CPT endorsement date on the I-20, that work is retroactively classified as unauthorised employment under 8 CFR 214.2(f)(10)(i). Unauthorised employment permanently bars you from OPT at that education level and creates a status violation that must be disclosed on all future visa applications. If you continue working after the CPT end date, each day beyond the authorization is a separate violation. If the DSO discovers the overstay, the SEVIS record is terminated, and the student falls out of F-1 status immediately. Multiple or extended CPT violations can lead to a finding of inadmissibility under INA 212(a)(6)(C) for misrepresentation if the student concealed the unauthorized employment from the DSO or USCIS.

Common CPT scenarios for different program types

The way CPT is structured varies significantly by academic program type. STEM graduate programs often require internships or cooperative education placements as part of the degree, making the integral-curriculum tie straightforward to document. Business and professional programs may offer elective internship courses where the student enrolls in a specific class that requires practical work experience as a graded component. Undergraduate programs typically have less structured CPT pathways, and the student must work with a faculty advisor to establish the curriculum tie directly. For each scenario, the key document is the same: a written offer letter from the employer that names specific duties directly connected to the degree field, combined with faculty or program documentation that confirms the work is integral to the academic program.

Extending or amending CPT after initial authorisation

If your CPT period needs to be extended beyond the original end date, or if your job duties, worksite, or hours change materially, you must obtain a new CPT authorisation. The process is the same as the initial CPT request: a new or amended offer letter reflecting the changed terms, faculty confirmation that the training remains curriculum-integral, and a new I-20 from the DSO with the updated CPT endorsement. Do not continue working under the old CPT authorisation after the end date passes, even if the employer is the same and the duties are unchanged. Working without current CPT authorisation is unauthorised employment and can lead to SEVIS termination and a loss of F-1 status.

Worked examples

Vague duties vs degree-linked duties

An offer letter says “general assistant — various duties as assigned.” There is no degree-field connection, no specific duties, and no course or practicum link. A better letter names the role, lists the specific technical tasks (for example: data pipeline development, statistical modeling, database design), names the supervisor, states the hours, and references the course or program requirement the role satisfies. The DSO can endorse the second letter. The first letter gives the DSO no basis for the endorsement.

Start date before I-20 endorsement

A student accepts an internship that begins Monday. The DSO issues the CPT I-20 on Wednesday. Work on Monday and Tuesday is unauthorised employment even if the letter was signed earlier. The correct sequence is: final offer letter → faculty/program endorsement (if required) → DSO SEVIS CPT endorsement on the I-20 → first day of work on or after the CPT start date printed on the I-20.

What to do next

• To compare CPT against OPT for the same role, read CPT vs OPT — which applies to you.
• For the risk profile of programs that rely on CPT from day one of enrollment, read Day 1 CPT — risk assessment.
• For the full OPT filing packet if you switch from CPT to OPT, read OPT document checklist.

This guide is general information, not legal advice for your specific situation. A licensed attorney or regulated adviser should review your documents before you rely on a strategy or deadline.