Key findings
✓F-1 students can intern through CPT during study or through OPT as practical training.
✓CPT needs authorization from your school DSO and must relate to your program.
✓STEM degrees get a 24-month OPT extension on top of the standard 12 months.
✓Timing and paperwork, not just the offer, decide whether you can start work.
✓Many postings filter out visa-needers, so target international-friendly employers.
12 mo
standard length of OPT
USCIS
+24 mo
additional months of OPT for eligible STEM degrees
USCIS
DSO
your school's designated official authorizes CPT
USCIS / school international office
If you are on an F-1 visa, you cannot just accept an internship and start. You need work authorization first. The two main routes for internships are CPT and OPT. They look similar from the outside, but they are authorized by different people and tied to different things.
| Route | When | Who authorizes | How long | Ties to |
|---|
| CPT | During your program | Your school DSO | Per employer and period, set by your school | Your curriculum and the specific job |
| OPT | Before or after you complete your program | USCIS | 12 months standard | Your field of study |
| STEM OPT | After standard OPT, for eligible STEM degrees | USCIS | 24 additional months | Your STEM degree and your employer |
Months of OPT under the standard rules
The short version: CPT is for internships tied to your degree while you study. OPT is practical training in your field that you apply for through USCIS.
CPT covers internships that are an integral part of your program. Your school decides whether your role qualifies, and your DSO is the one who authorizes it. Rules differ between schools, so the most useful first step is a short email to your international student office.
It must relate to your program. A finance internship for a finance student fits. An unrelated role may not. You need an offer first. Your school typically needs the employer, role, dates and hours before it authorizes CPT. Do not start early. Work only begins once CPT is authorized on your record. Starting before that can put your status at risk. Full time and part time are different. CPT is authorized as one or the other, and heavy full-time use can affect your later OPT eligibility. Ask your DSO how this applies to you. Day 1 CPT. You may see this term. Whether CPT is available from your first day depends on your school and program, and it gets extra scrutiny. Check with your DSO and rely on official guidance. Ask your DSO before you say yes to an offer. A good internship you cannot legally start is worth nothing, and the paperwork takes time.
OPT is practical training directly related to your field of study. You can use it before you complete your program or after. It is authorized by USCIS, usually through an employment authorization document, and your DSO is involved in the process. You generally cannot start until the approval is in hand.
Standard OPT is 12 months. If your degree is on the STEM list, you may qualify for a 24-month extension on top, which can bring the total to 36 months. Eligibility depends on your degree and your employer, so verify current requirements with USCIS and your DSO.
"Using OPT for a summer internship spends part of your OPT time. Plan your months like a budget."
Studojo guidance, confirm with your DSOAuthorization is half the battle. The other half is finding an employer willing to take on the paperwork and the long-term question of sponsorship. Some employer types are far more open than others. The chart below is an editorial rating, not a measured statistic.
Typical openness to international interns by employer type (editorial, 1-5)
Large tech, consulting and finance firms often have established processes for international students. Universities and research labs deal with student authorization all the time. Funded startups can be open, but each one is a case by case conversation. Government and defense roles usually require citizenship or similar and are a poor fit. Many job posts and application forms ask whether you will need visa sponsorship. Answer yes to some of them and you are filtered out automatically. That does not mean the door is closed. It means you should spend effort where the filter is not.
Where to spend your search effort (illustrative split)
Read the sponsorship line carefully. "No sponsorship" usually refers to long-term work visas. Ask whether CPT or OPT work is fine, because for an internship it often is. State your authorization plainly. "I am an F-1 student authorized to work through CPT" answers the question before it becomes a worry. Reach hiring managers directly. A short, specific message skips the form filter entirely. Use your school. Career offices and alumni networks know which employers have hired international students before. Studojo's outreach tool finds the right people at the right companies and helps you write the message, so you are not stuck behind a form that screens you out.
Paperwork takes time, and the offer is not the last step. Work backward from your start date.
Months before: talk to your DSO about which route fits and any limits on your program. With an offer: give your DSO the employer, role, dates and hours, and ask what they need from the employer. Before day one: confirm your authorization is on record and any required document is in hand. Do not start early. During the internship: keep your DSO updated on any change in role, dates or employer. Informational only, not legal advice. Immigration rules change and your situation is specific. Confirm everything with your school's DSO and official USCIS guidance before you act.
Can international students do internships in the USA?
Yes. F-1 students can intern in the US through Curricular Practical Training (CPT) while studying or through Optional Practical Training (OPT). Both need authorization first, and you must not start work before it is in place. Your school's DSO is the person to confirm which route fits you.
What is CPT?
CPT is Curricular Practical Training, work authorization that lets you do an internship as part of your degree program. It must relate to your program of study, and your school's DSO authorizes it. The details vary by school, so ask your international student office before you accept an offer.
What is the difference between CPT and OPT?
CPT is tied to your curriculum and authorized by your school's DSO. OPT is practical training related to your major, authorized by USCIS, and can be used before or after you complete your program. CPT is employer and role specific. OPT is broader but needs an approved employment authorization document.
Do I need OPT for a summer internship?
Not always. Many students use CPT for a summer internship because it is tied to the program and authorized by the school. Using OPT for a summer role spends part of your OPT time, so check with your DSO before you decide which to use.
How long is STEM OPT?
STEM OPT is a 24-month extension on top of the standard 12 months of OPT, for eligible STEM degrees. That makes up to 36 months in total. Eligibility depends on your degree and your employer, so confirm the current rules with your DSO and official USCIS guidance.
How do I find internships that hire international students?
Target employers with a track record of hiring international students, and skip postings that say they cannot sponsor or support work authorization, unless your CPT or OPT already covers you. Reach out directly to hiring managers and lead with your authorization status in plain words. Studojo's outreach tool helps you find and contact them.
Reach the people who hire international interns.
Studojo's outreach tool finds hiring managers at the companies you want and helps you write a message that states your authorization clearly.