If you’re an F-1 student trying to work legally in the US, you’ll run into two acronyms almost immediately: CPT and OPT. They sound similar, both let you work, and both are tied to your F-1 status — but they’re authorized by different people, follow different rules, and a mistake with one can permanently cost you the other. This guide breaks down exactly how each works, the single rule that trips up the most students, and how to apply for both in 2026.
The one-sentence difference
CPT (Curricular Practical Training) is work that’s part of your academic program, approved by your school’s Designated School Official (DSO) and printed on your I-20 — usually before or during your studies. OPT (Optional Practical Training) is work authorization from USCIS, tied to your field of study but not tied to your curriculum, primarily used after graduation, and it requires a federal application with a physical Employment Authorization Document (EAD).
| CPT | OPT | |
|---|---|---|
| Who authorizes it | Your school’s DSO | USCIS |
| Appears on | Your I-20 | A separate EAD card |
| Timing | Usually during your program | Usually after graduation (pre-completion OPT also exists) |
| Standard duration | Per-semester, renewable while you’re enrolled | 12 months |
| STEM extension | Not applicable | +24 months for STEM degrees (36 months total) |
| Processing time | Days to a few weeks | 90–180 days — apply early |
| Government fee | None (school course fees may apply) | Form I-765 fee |
CPT: training that’s part of your curriculum
CPT covers internships, cooperative education, or practicums that are an integral part of an established curriculum — meaning your program either requires the work experience or offers academic credit for it. Your DSO authorizes CPT by endorsing a new page of your I-20; there’s no USCIS filing and no separate card. Because it’s school-controlled, CPT can typically be approved within days, which makes it attractive for students who land a fall or summer internship on short notice.
CPT comes in two flavors that matter enormously for your future OPT eligibility:
- Part-time CPT — 20 hours per week or less. This does not count against your 12-month OPT eligibility limit, no matter how many semesters you do it.
- Full-time CPT — more than 20 hours per week, typically during a co-op term or summer.
The rule that eliminates OPT eligibility
This is the detail every F-1 student should know before accepting a full-time internship: if you accumulate 12 months or more of full-time CPT at a given education level, you become permanently ineligible for OPT at that same level. A student who does three full-time summer co-ops of four months each, for example, hits the 12-month threshold and loses OPT eligibility for that degree entirely — even if they never used a day of OPT. Part-time CPT carries no such penalty, so if your school offers the choice, keeping internships to 20 hours/week during the semester (and saving full-time work for OPT after graduation) preserves your options.
OPT: work authorization from USCIS
OPT is available in two windows:
- Pre-completion OPT — part-time (20 hrs/week) while still enrolled, or full-time during official school breaks.
- Post-completion OPT — full-time work for up to 12 months after you finish your program, in a job directly related to your field of study.
To use post-completion OPT, your DSO recommends it in SEVIS and issues an updated I-20; you then file Form I-765, Application for Employment Authorization, with USCIS. As of April 2026, the filing fee is $470 online or $520 by paper, and you must file within 30 days of your DSO’s recommendation. Processing commonly takes 90–180 days, so most advisors recommend filing as early as 90 days before your program end date — you cannot begin working until the physical EAD card arrives, regardless of your graduation date.
The STEM OPT extension
If your degree is on the Department of Homeland Security’s STEM Designated Degree list, you can extend post-completion OPT by an additional 24 months, for 36 months total — the route most international STEM graduates use to buy time toward an H-1B lottery entry or employer sponsorship. Requirements include:
- Your employer must be enrolled in E-Verify.
- You and your employer must complete a formal Form I-983 Training Plan describing how the role connects to your STEM field.
- You must apply for the extension before your initial 12-month OPT expires.
See our H-1B visa guide for how STEM OPT commonly bridges into longer-term US work status.
Common mistakes that cost students their status
- Working before the EAD arrives. Even with an approved I-765 receipt notice, you cannot legally start OPT employment until you physically have the EAD card in hand.
- Letting full-time CPT stack past 12 months without realizing it forecloses OPT — always ask your DSO to confirm your cumulative full-time CPT hours before accepting another full-time internship.
- Missing the unemployment clock on OPT. Standard OPT allows up to 90 days of unemployment; STEM OPT extends that to 150 days total — exceeding it puts your status at risk.
- Filing the I-765 late. Filing outside the window tied to your DSO’s SEVIS recommendation can result in a rejected application with no OPT for that degree level.
Frequently asked questions
Can I do CPT and OPT for the same degree? Yes, as long as your cumulative full-time CPT stays under 12 months — part-time CPT never affects your OPT eligibility.
Can I switch employers on OPT? Yes, standard OPT is not employer-specific, though you must report the change to your DSO within 10 days and it counts toward your unemployment clock if there’s a gap.
Does OPT count toward the H-1B cap? No — OPT (including the STEM extension) is separate from the H-1B lottery, but many students use the STEM extension specifically to get extra lottery attempts while working.
What happens if my OPT application is denied? You generally must depart the US or transfer to another qualifying status once your F-1 grace period ends, unless you have another valid basis to remain — talk to your DSO immediately if this happens.
Plan your work authorization before you need it
CPT and OPT decisions made early in your program — how many full-time internships you take, when you file your I-765 — determine how much of your post-graduation runway you actually have. VisaMet is building tools to help international students track SEVIS deadlines and flag CPT/OPT eligibility issues before they become irreversible. Join the VisaMet waitlist for early access.
This guide is preparation guidance, not legal advice. CPT and OPT rules are set by USCIS, ICE/SEVP and your individual school, and they change — always confirm your specific eligibility with your DSO and the current Study in the States OPT guidance and USCIS OPT page before making a decision.