F-1 students can work in the United States, but only through specific, authorized channels, and getting them wrong is one of the fastest ways to lose status. The two that matter most are Optional Practical Training (OPT) and Curricular Practical Training (CPT). Both let you work in your field of study, but they work very differently, and the timing rules are unforgiving.
OPT is temporary work authorization in your field, most often used after you graduate. Standard post-completion OPT gives eligible students a defined period of authorized work, and students in qualifying science, technology, engineering, and math fields can apply to extend it through STEM OPT. The catch is the clock: OPT has firm application windows and strict limits on how long you can be unemployed while on it. File late, or rack up too many unemployment days, and the authorization can collapse. As an OPT lawyer, most of what we do is protect that timeline: filing early, documenting the job relationship, and tracking the deadlines that USCIS will not remind you about.
CPT is different. It is training that is an integral part of your curriculum (an internship or practicum tied to your program), and it is authorized by your school's DSO, not by a separate USCIS application. It has to be curricular, meaning genuinely part of your studies, and it must be authorized before you start. "Day 1 CPT" programs, which offer work authorization from the very first term, draw heavy government scrutiny and can put your status and any future green card at risk if the CPT is not truly integral to a legitimate curriculum. A CPT attorney's role is to tell you the truth about a program before you rely on it, not after an immigration officer questions it.