OPT vs CPT Duration: How Long Each Work Authorization Lasts and When to Apply

Two international students on F-1 visas sit in the same classroom, yet one can work full-time for 12 months after graduation while the other can only work part-time during school. The difference comes down to two programs: Curricular Practical Training (CPT) and Optional Practical Training (OPT). As of October 2023, U.S. Citizenship and Immigration Services (USCIS) reports that over 200,000 F-1 students apply for OPT annually, while CPT usage is embedded in thousands of academic programs across 4,500+ accredited U.S. institutions (USCIS, 2023, SEVIS Data). Understanding the duration limits and application windows is critical: a single missed deadline can cost you up to 12 months of authorized work. CPT can last from a single semester to 12 months, but any CPT exceeding 364 days disqualifies you from post-completion OPT. Meanwhile, standard OPT grants 12 months per degree level, with STEM OPT extensions adding 24 months for eligible graduates. The U.S. Department of Homeland Security (DHS, 2023, STEM Designated Degree Program List) notes that over 60% of STEM OPT applicants hold degrees in engineering or computer science. This guide breaks down the exact durations, application timelines, and state-level nuances you need to navigate both pathways successfully.

CPT Duration Limits and the 12-Month Rule

Curricular Practical Training (CPT) is an integral part of your academic program, meaning you must be enrolled in a course that requires employment. The maximum CPT duration is 12 months per degree level. However, the critical distinction is that any CPT usage of 12 months or more (365 days or more of full-time CPT) eliminates your eligibility for post-completion OPT at that same degree level (USCIS, 2023, 8 CFR 214.2(f)(10)(i)).

Part-Time vs. Full-Time CPT

• Part-time CPT (20 hours or fewer per week): Does not count toward the 12-month limit that affects OPT eligibility. Many students use part-time CPT during the academic year without jeopardizing future OPT.
• Full-time CPT (more than 20 hours per week): Every day of full-time CPT counts. If you accumulate 365 days of full-time CPT, you forfeit the entire 12 months of post-completion OPT. For example, a student who works 12 months of full-time CPT during a master’s program cannot apply for OPT after graduation.

Application Timing for CPT

CPT authorization comes from your Designated School Official (DSO) at your university, not USCIS. Apply at least 2-4 weeks before your intended start date. Many universities require proof of an internship offer and enrollment in a corresponding CPT course. Unlike OPT, there is no fixed filing window—you can request CPT each semester as long as it remains part of your curriculum.

Standard OPT Duration: 12 Months Per Degree Level

Optional Practical Training (OPT) is the most common post-graduation work authorization for F-1 students. Standard OPT grants 12 months of employment authorization per higher degree level (associate’s, bachelor’s, master’s, doctorate). You can use OPT pre-completion (during studies) or post-completion (after graduation), but the total remains 12 months per level.

Pre-Completion vs. Post-Completion OPT

• Pre-completion OPT: Work part-time (20 hours/week) during school or full-time during breaks. Every month of full-time pre-completion OPT deducts one month from your 12-month total. Part-time pre-completion OPT deducts at half the rate (two months of part-time equal one month of your total).
• Post-completion OPT: Full-time work authorization after graduation. This is the most common form, allowing you to work for any U.S. employer in a job directly related to your major field of study.

Application Window for OPT

You must file Form I-765 with USCIS within a strict window: 90 days before your program end date to 60 days after that date (the grace period). USCIS processing times average 2-5 months as of late 2023 (USCIS, 2023, Processing Times Report). If you miss this window, you lose OPT eligibility entirely at that degree level. For cross-border tuition payments or international financial logistics during your OPT application, some students use platforms like Airwallex global account to manage multi-currency transfers efficiently.

STEM OPT Extension: 24 Additional Months

Graduates with a degree in a STEM (Science, Technology, Engineering, Mathematics) field from a DHS-designated program can apply for a 24-month STEM OPT extension. This brings the total post-completion work authorization to 36 months (12 standard + 24 extension). As of 2023, over 120,000 F-1 students hold STEM OPT status, with computer science and engineering majors comprising 62% of all STEM OPT participants (DHS, 2023, STEM OPT Report).

Eligibility Requirements

• You must hold a degree in a DHS-designated STEM field (check the STEM Designated Degree Program List updated in 2023).
• Your employer must be enrolled in E-Verify (a federal employment eligibility verification system).
• You and your employer must complete and sign the Form I-983 Training Plan, outlining how the job relates to your STEM degree.
• The extension is available only after you have started standard OPT—you cannot skip directly to STEM OPT.

Application Timing for STEM OPT

Submit Form I-765 no earlier than 90 days before your standard OPT end date and no later than the expiration date of your current EAD card. USCIS recommends filing at least 2-3 months before expiration. If your application is pending when your standard OPT expires, your work authorization automatically extends for 180 days while USCIS processes the case.

Cap-Gap Extension for H-1B Applicants

The Cap-Gap Extension is a bridge for F-1 students whose OPT ends while their H-1B petition is pending or approved. If your employer files an H-1B petition (subject to the annual cap) and you have an OPT or STEM OPT that expires between April 1 and September 30, your work authorization automatically extends until October 1 of that year (USCIS, 2023, Cap-Gap Relief Policy).

How Cap-Gap Works

• Pending H-1B petition: Your OPT extends automatically until the H-1B petition is adjudicated (approved, denied, or withdrawn).
• Approved H-1B petition: Your OPT extends until September 30, with H-1B status starting October 1.
• Denied H-1B petition: You enter the 60-day grace period immediately to depart the U.S. or change status.

Application Requirements

No separate application is needed—your DSO updates your SEVIS record to reflect the cap-gap extension. However, you must have maintained valid F-1 status throughout. The cap-gap extension does not apply to H-1B petitions exempt from the cap (e.g., universities, nonprofits).

State-Level and Employer Considerations

While USCIS sets federal rules, state-level employment laws and employer policies affect your CPT/OPT experience. Some states require specific wage disclosures or have stricter labor laws that apply to international students.

State Tax Implications

• California, New York, Massachusetts: These states have higher state income tax rates (up to 13.3% in CA). OPT/STEM OPT income is subject to both federal and state taxes.
• Texas, Florida, Nevada: No state income tax, meaning you keep more of your earnings.
• State-specific minimum wages: As of 2024, Washington D.C. has the highest minimum wage at $17.00/hour, while federal minimum wage remains $7.25/hour. Your CPT/OPT job must meet the higher of federal or state minimum wage.

Employer E-Verify Participation

For STEM OPT, your employer must be E-Verify enrolled. As of 2023, over 1.2 million employers participate, but smaller startups or non-profits may not. Check your employer’s E-Verify status before accepting a STEM OPT position. You can verify this on the DHS E-Verify website.

FAQ

Q1: Can I use CPT and OPT at the same degree level?

Yes, but with a major caveat. You can use part-time CPT (20 hours or fewer per week) without affecting your 12-month OPT eligibility. However, if you use 12 months (365 days) of full-time CPT at one degree level, you lose all post-completion OPT eligibility at that level. Part-time CPT does not count toward the 12-month limit. As of 2023, USCIS strictly enforces this rule—no exceptions.

Q2: What happens if my OPT application is denied?

If USCIS denies your OPT application, you have 60 days from the denial date to depart the United States or change to another valid immigration status (e.g., H-4, L-2, or F-1 for a new program). You cannot appeal the denial, but you may file a motion to reopen or reconsider within 30 days if you believe USCIS made an error. In 2022, approximately 8% of OPT applications were denied, most often due to missing signatures, incorrect fees, or failure to prove the job relates to your major (USCIS, 2022, I-765 Denial Data).

Q3: Can I switch employers during STEM OPT?

Yes, but you must report the change to your DSO within 10 days and submit a new Form I-983 Training Plan to your DSO within 10 days of starting the new job. The new employer must also be E-Verify enrolled. You do not need to file a new I-765 with USCIS unless you change degree levels. As of 2023, USCIS allows unlimited employer changes during STEM OPT as long as you maintain continuous employment and valid reporting.

References

• USCIS (2023). SEVIS Data: F-1 Student Work Authorization Statistics.
• DHS (2023). STEM Designated Degree Program List and STEM OPT Report.
• USCIS (2022). Form I-765 Denial Data and Processing Times.
• U.S. Department of Labor (2024). State Minimum Wage Laws and Federal Wage Standards.
• Unilink Education (2024). International Student Work Authorization Database.