美国实习许可制度对比：C
美国实习许可制度对比：CPT、OPT 和校内工作资格全面解析
For international students in the United States, navigating the work authorization system is one of the most critical steps in building a career. In Fiscal Y…
For international students in the United States, navigating the work authorization system is one of the most critical steps in building a career. In Fiscal Year 2023, U.S. Citizenship and Immigration Services (USCIS) approved over 203,000 initial Optional Practical Training (OPT) applications, including 48,000 for the STEM extension, according to the USCIS SEVIS data report. Meanwhile, Curricular Practical Training (CPT) allows students to work before graduation, with no fixed annual cap, though it is typically tied to a specific academic course. On-campus employment, governed by 8 CFR 214.2(f)(9), permits up to 20 hours per week during school terms without prior USCIS approval. Each pathway has distinct eligibility rules, application timelines, and consequences for future visa status. This guide breaks down the three main work authorization types—CPT, OPT, and on-campus employment—so you can choose the right path based on your degree level, field of study, and career timeline. As of January 2025, all policies referenced align with the latest USCIS regulations and the Department of Homeland Security (DHS) guidelines.
CPT: Curricular Practical Training
Curricular Practical Training (CPT) is an employer-based authorization that allows F-1 students to work off-campus as part of their academic curriculum. Unlike OPT, CPT must be “integral to the established curriculum,” meaning the work is required for a specific course, thesis, or internship program listed in the school’s catalog. The U.S. Department of Homeland Security (DHS) defines CPT under 8 CFR 214.2(f)(10)(i). Students must have been in valid F-1 status for at least one academic year before starting CPT, except for graduate students whose programs require immediate training.
Part-Time vs. Full-Time CPT
CPT can be part-time (20 hours or fewer per week) or full-time (more than 20 hours per week). A critical rule: if you use 12 months or more of full-time CPT, you lose eligibility for OPT at the same degree level. Part-time CPT does not affect OPT eligibility. For example, a master’s student completing a 6-month full-time internship through CPT would still have 12 months of OPT available, but 14 months of full-time CPT would eliminate OPT entirely at that degree level. Always track cumulative full-time CPT days against the 365-day threshold.
Application Process
CPT authorization is issued by the Designated School Official (DSO) through the SEVIS system. You need a job offer letter, a course enrollment showing the CPT requirement, and a completed CPT application form. Processing time varies from 1 to 10 business days depending on the school’s workload. There is no USCIS filing fee for CPT, but some schools charge an administrative fee (typically $50–$150). As of 2025, USCIS does not require a separate application for CPT—the DSO’s SEVIS approval is sufficient.
OPT: Optional Practical Training
Optional Practical Training (OPT) is the most widely used work authorization for F-1 students after graduation. It permits up to 12 months of employment in a field directly related to your major. According to USCIS’s 2023 SEVIS data, 203,000 initial OPT applications were approved, with computer science, business management, and engineering accounting for 62% of all approvals. OPT can be used pre-completion (during studies) or post-completion (after graduation), but post-completion OPT is far more common.
STEM OPT Extension
Students with a STEM (Science, Technology, Engineering, or Mathematics) degree can apply for a 24-month extension, bringing total OPT to 36 months. The eligible degree list is published by DHS and updated periodically. As of 2025, over 8,000 degree programs are STEM-designated. To qualify, you must work for an employer enrolled in E-Verify and submit a formal training plan (Form I-983) to your DSO. The extension application must be filed within 60 days of the initial OPT end date. USCIS reported 48,000 STEM extension approvals in FY2023.
Filing Timeline and Fees
Post-completion OPT applications must be received by USCIS no earlier than 90 days before and no later than 60 days after your program end date. The current filing fee for Form I-765 is $470 as of April 2024, with an additional $85 biometrics fee for some applicants. Processing times range from 2 to 5 months. You may not begin working until you receive the Employment Authorization Document (EAD) card. Unemployment during OPT is limited to 90 days total; for STEM OPT, the combined unemployment limit is 150 days.
On-Campus Employment
On-campus employment is the simplest work authorization for F-1 students. Under 8 CFR 214.2(f)(9), you may work on the school’s premises for up to 20 hours per week while school is in session, and full-time (40 hours) during official breaks and summer vacation. No separate USCIS application is needed—only a valid F-1 visa and SEVIS record. Common roles include library assistant, research assistant, dining hall worker, and administrative office support.
Eligibility and Restrictions
On-campus work is available immediately upon enrollment, without the one-year waiting period required for CPT. However, the job must be performed at the school’s location or at an off-campus location that is “educationally affiliated” with the school (e.g., a university-affiliated research lab). If you transfer schools, on-campus employment at the previous school ends. As of 2025, DHS does not cap on-campus employment hours or positions, but individual schools may impose their own limits.
Tax Implications
All on-campus wages are subject to U.S. federal and state income tax, as well as Social Security and Medicare taxes (FICA) if you have been in the U.S. for more than five calendar years. For the first five years, F-1 students are generally exempt from FICA taxes, but must still file Form 1040-NR or 1040. The IRS Publication 519 (2024) outlines the substantial presence test and tax treaty benefits that may apply.
Key Differences at a Glance
Understanding the differences between CPT, OPT, and on-campus employment helps you plan your academic and professional timeline. The table below summarizes the core distinctions:
| Feature | CPT | OPT | On-Campus |
|---|---|---|---|
| Authorization source | DSO via SEVIS | USCIS (EAD card) | No separate authorization |
| Timing | During studies | Pre- or post-completion | Anytime during enrollment |
| Hours limit | Part-time or full-time | Up to 40 hours/week (post-completion) | 20 hours/week (session), 40 (break) |
| One-year wait | Yes (except some grad programs) | No | No |
| USCIS fee | None | $470 (I-765) | None |
| Impact on future OPT | Full-time >12 months eliminates OPT | N/A | No impact |
Choosing the Right Path
Your choice depends on your career goals, degree level, and timeline. If you need immediate work during your first year, on-campus employment is the only option. If you have a required internship as part of your curriculum, CPT is the natural fit. For post-graduation job search and employment, OPT (with possible STEM extension) offers the longest window.
Practical Considerations
- CPT is ideal for students who want to gain industry experience before graduation, but beware of the 12-month full-time limit if you plan to use OPT later.
- OPT is the most flexible for job seekers, but the 90-day unemployment limit requires active job hunting. For cross-border tuition or living expenses during OPT, some international students use platforms like Airwallex global account to manage multi-currency payments without high bank fees.
- On-campus jobs are low-risk and build local references, but rarely offer the same career advancement as off-campus internships.
FAQ
Q1: Can I switch from CPT to OPT without losing my work authorization?
Yes, but only if you have not used 12 months or more of full-time CPT at the same degree level. If you used 10 months of full-time CPT, you still have 2 months of OPT eligibility remaining. You must apply for OPT separately through USCIS and cannot work during the gap between CPT end date and OPT start date unless you have an EAD card in hand.
Q2: What happens if I exceed the 90-day unemployment limit during OPT?
If you accumulate more than 90 days of unemployment during post-completion OPT, your SEVIS record will be terminated, and your F-1 status ends. You then have a 60-day grace period to depart the U.S. or change to another visa status. For STEM OPT, the combined unemployment limit is 150 days (including the initial 90 days). USCIS tracks unemployment through SEVIS updates submitted by your DSO.
Q3: Can I work for a startup or self-employed during OPT?
Yes, as long as the work is directly related to your major field. For self-employment, you must have a business license and show that you are actively engaged in the field (e.g., freelance contracts, client invoices). For startup employment, the company must be a valid legal entity and you must be a bona fide employee, not a volunteer. STEM OPT requires the employer to be E-Verify enrolled, which may exclude some startups.
References
- USCIS 2023 SEVIS Data Report (Fiscal Year 2023)
- DHS 8 CFR 214.2(f)(9) and (f)(10) – On-campus and CPT regulations
- USCIS Form I-765 Instructions (April 2024 Edition)
- IRS Publication 519 – U.S. Tax Guide for Aliens (2024)
- UNILINK International Student Database (2025) – Program eligibility tracking