Guide · International students

CPT vs OPT, without the acronym soup

Two different work authorizations, two different authorities, two different deadlines. Confusing them is how international students lose an internship — or their status. Here is what each one actually is, and how to plan a timeline backwards from the offer you want.

This is not legal advice. I built a planning tool after spending years inside the US immigration system myself; I am not an attorney. Rules and processing times change. Confirm every date and every eligibility question with your school's Designated School Official (DSO) or a licensed immigration attorney before acting, and check the official sources linked at the bottom.

The one-table version

CPTOPT
Full nameCurricular Practical TrainingOptional Practical Training
Who authorizes itYour DSO, directly in SEVISUSCIS, after you file Form I-765
Cost & documentNo USCIS fee; a new I-20 with the CPT endorsementFiling fee; an EAD card you must have before starting work
EmployerSpecific employer, role, and datesNot employer-specific — any job in your field of study
Job offer needed first?YesNo
Typical timingDuring the degreeUsually after the degree (post-completion)
Time limitNo fixed cap, but 12+ months full-time kills OPT at that level12 months per education level, plus a possible 24-month STEM extension
Lead timeDays to weeks, set by your schoolMonths — file early in the 90-day window

When can you use CPT?

The general rule: one full academic year of full-time enrollment in F-1 status before CPT is available, with a narrow exception for graduate programs that require immediate practical training. On top of that, three conditions have to hold:

  • The work is an integral part of your established curriculum — attached to a course, a required internship, or a program requirement, not simply relevant to your major.
  • You have a job offer in hand, because the authorization names the employer, the role, and exact dates.
  • Your DSO authorizes it in SEVIS and issues a new I-20 before your first day.

That last one is not a formality. Working a single day before the authorization date is a status violation, and "the offer letter said I could start Monday" is not a defence.

Does CPT burn your OPT?

Only past a threshold. Twelve months or more of full-time CPT at one education level eliminates OPT at that level. Part-time CPT does not count against it, and full-time CPT under twelve months does not either. A student doing one or two summer internships is nowhere near the line — but a student doing back-to-back full-time CPT year-round should count the months carefully.

How does OPT work?

OPT is federal work authorization for employment in your field of study. It comes in two flavours:

  • Pre-completion OPT — used while still enrolled. It is deducted from the same twelve-month allowance, which is why most students avoid it and use CPT during the degree instead.
  • Post-completion OPT — the common one, starting after your program end date.

The allowance is twelve months per higher education level. Finish a bachelor's, use twelve months, later finish a master's, and a fresh twelve months becomes available.

The STEM extension

Students with a qualifying degree from the STEM list, working for an E-Verify employer, can apply for a 24-month extension — up to 36 months total at that level. It requires a formal training plan (Form I-983) signed by the employer, plus periodic reporting. The extension application must be filed before the current OPT EAD expires, so the planning happens roughly six months before it ends, not after.

Deadlines that actually bite

  1. The I-765 can be filed up to 90 days before your program end date and up to 60 days after it.
  2. It must reach USCIS within 30 days of your DSO entering the OPT recommendation in SEVIS, or it can be denied.
  3. 90 days of unemployment are allowed on post-completion OPT; the STEM extension adds 60 more, for 150 cumulative.
  4. You cannot start work until the EAD is in hand and its start date has arrived — an approval notice is not permission to work.

Processing time is the variable that ruins plans. It is not unusual for an EAD to take months, and filing late does not move the start date up. Apply early in the 90-day window and treat the whole thing as a deadline problem rather than a paperwork problem.

How to plan the timeline backwards

Start from the day you want to be legally working and count backwards:

  1. Target start date for the role.
  2. Minus the EAD processing window (assume months, not weeks) → latest safe filing date.
  3. Minus the DSO recommendation step, which must precede filing by no more than 30 days → DSO appointment date.
  4. Minus your school's own internal turnaround → the date you actually have to start.

For CPT the chain is shorter but the constraint moves to the offer: you need the signed offer, then the DSO authorization, then day one — in that order, with no overlap.

The free Visa Navigator builds this backward timeline for you → It runs entirely in your browser, stores nothing on a server, and exports a checklist you can bring to your DSO appointment.

A note on changing status into F-1

Students already in the US in another nonimmigrant category — dependent statuses in particular — sometimes need a change of status to F-1 before any of this applies, typically by filing Form I-539. That filing has its own processing timeline, and the CPT one-academic-year clock interacts with it. If that is your situation, get an attorney's read on how your prior enrollment counts before you plan an internship around it. Many universities offer free or low-cost immigration legal services to enrolled students; that is the cheapest first call you can make.

Official sources

Tools referenced in this guide

  • Visa Navigator — backward-planned change-of-status and CPT/OPT timeline, document checklist, browser-only.
  • Apply OS — track internship, scholarship, and grant deadlines alongside the immigration ones.

FAQ

Quick answers

What is the difference between CPT and OPT?

CPT (Curricular Practical Training) is work authorization tied to a specific employer and to your curriculum, authorized by your school's Designated School Official directly in SEVIS, with no USCIS filing and no fee. OPT (Optional Practical Training) is USCIS-issued work authorization in your field of study that is not employer-specific, requires filing Form I-765 with a fee, and results in an EAD card. CPT is usually used during the degree; OPT is most often used after it.

When is an F-1 student eligible for CPT?

Generally after being enrolled full-time in F-1 status for one full academic year, with a narrow exception for graduate programs that require immediate practical training. The work must be an integral part of the established curriculum, you must have a job offer before authorization, and the DSO must authorize it in SEVIS before the start date. Working before that authorization is a status violation.

Does CPT affect OPT eligibility?

Yes, but only past a threshold. Twelve months or more of full-time CPT at one education level eliminates OPT eligibility at that level. Part-time CPT of any duration does not, and full-time CPT under twelve months does not. Most students who use CPT for a summer internship or two are nowhere near the limit.

How long does OPT last?

Twelve months of OPT per higher education level — so a bachelor's degree and later a master's degree each carry their own twelve months. Students with a qualifying STEM degree working for an E-Verify employer may apply for a 24-month STEM extension, for up to 36 months total at that level.

When should you apply for post-completion OPT?

USCIS accepts an I-765 filed up to 90 days before your program end date and up to 60 days after it, and the request must reach USCIS within 30 days of the DSO entering the OPT recommendation in SEVIS. Because processing can take months, applying early in the 90-day window is the standard advice — the EAD start date does not move up just because the application was late.

How many days of unemployment are allowed on OPT?

Post-completion OPT allows a total of 90 days of unemployment. The 24-month STEM extension adds 60 more days, for 150 cumulative days across the whole period. Exceeding the limit is a status violation, and employment must be reported to the DSO so the SEVIS record stays accurate.

Can you work on CPT and OPT at the same time?

Not simultaneously in the usual sense. CPT is authorized while you are enrolled and tied to curriculum; post-completion OPT begins after the program end date. Pre-completion OPT exists and can be used during studies, but it is deducted from the same twelve-month allowance, which is why most students prefer CPT during the degree and save OPT for after.

Do you need a job offer before applying?

For CPT, yes — the authorization names a specific employer, dates, and role. For OPT, no: OPT is granted for work in your field of study generally, so you can apply without an offer in hand. That difference is why OPT applications are filed on a calendar deadline and CPT applications are filed on a hiring deadline.

Keep reading

One full academic year, full-time, in F-1 statusThe one-academic-year requirement, what full-time enrollment actually means, and the mistakes that quietly end… Verify sponsorship yourself. Every list is already wrong.Stop trusting sponsorship lists. Verify it yourself from req language, public disclosure data, and one written… The internship search, run as a systemThe timeline, the sponsorship question, and how work authorization actually fits an internship. Eligibility first, essays secondWhere eligibility breaks, how the funding types differ, and how to run a real pipeline.

Every guide is indexed on the guides hub. Or put it to work in the visa timeline planner and what I am open to for Summer 2027.