You've arrived for your master's program, found a job at the campus library, and HR wants your Social Security number. You don't have one. Here's how the F-1 rules and SSA's rules fit together.
As of November 2, 2026, this covers what counts as on-campus work, how many hours you can work, and what Social Security needs.
- On-campus work can't exceed 20 hours a week while school is in session.
- F-1 students may work on campus full-time when school isn't in session.
- Commercial firms that serve students on campus, such as the bookstore, count as on-campus.
- SSA needs evidence of the on-campus job, not just the I-20, to assign an SSN.
- Accepted evidence is a DSO letter plus a pay slip or employer letter, or an employer letter signed off by the DSO.
- New students may start on-campus work up to 30 days before classes begin.
Can F-1 students work on campus?
Yes, without a separate permit. SSA's manual explains that F-1 students "do not have DHS granted general employment authorization but, when maintaining student status, may work in employment connected with their purpose for admission," including "general on-campus jobs (includes graduate program teaching assistantships and fellowships)" (SSA POMS RM 10211.240).
How many hours?
Twenty in term, full-time on breaks. The regulation says on-campus employment "must not exceed 20 hours a week while school is in session," and that "an F-1 student may, however, work on campus full-time when school is not in session or during the annual vacation" (8 CFR 214.2(f)(9)(i), eCFR). The 20-hour limit can be lifted only if DHS suspends it "by means of notice in the Federal Register" in emergent circumstances.
What counts as on-campus?
More than the campus buildings, but not everything there. The regulation says the work must be "performed on the school's premises, (including on-location commercial firms which provide services for students on campus, such as the school bookstore or cafeteria), or at an off-campus location that is educationally affiliated with the school."
- A firm on campus that doesn't serve students isn't on-campus work: "a construction company building a school building" doesn't count.
- Off-campus affiliated work must be "associated with the school's established curriculum or related to contractually funded research projects at the post-graduate level," and "must be an integral part of the student's educational program."
Anything else needs CPT or OPT. Our guide to CPT vs OPT explains the difference. Our guide to STEM OPT rules covers the extension after OPT.
How do you get an SSN for an on-campus job?
With proof of the job. SSA says an F-1 student's status and I-20 establish work authorization, "however, in order to assign an SSN for general on-campus employment, SSA requires the F-1 student to submit evidence of on-campus employment" (SSA POMS RM 10211.245).
It accepts two ways to show it:
| Option | What to bring |
|---|---|
| Two documents | "A letter from the DSO" plus "a recent pay slip" or "an original employer letter" |
| One document | An employer letter that includes the DSO letter's required information and is signed off by the DSO |
Bring these with your passport, I-94 and I-20, and ask your international student office for the DSO letter. Once you're settled, our guide to driver's licenses for F-1 and OPT students covers the DMV.
For other types of work, the evidence changes. CPT needs "Form I-20, page 2 completed showing employment information," and OPT needs the EAD. SSA notes that "EADs issued to foreign students will not reflect the approved type of work (e.g., OPT)" (SSA POMS RM 10211.240).
Can you apply before classes start?
Close to it. SSA says that "when the F-1 student initially arrives in the U.S., the student may start general on-campus employment at the school up to 30 days before classes actually start," so "it is possible to assign an SSN to an F-1 student in the summer prior to classes starting if requirements are met." The regulation says the same thing from the other side: a new student "may not begin on-campus employment more than 30 days prior to the actual start of classes."
USCIS's SAVE program also suggests waiting after arrival. Its fact sheet for students says DHS's Student and Exchange Visitor Program recommends waiting at least 10 calendar days after arriving in the US before applying for an SSN (USCIS, SAVE Fact Sheet for Students).
What if you don't have a job?
Then SSA generally won't issue a number. It assigns numbers to noncitizens without work authorization only for a narrow set of benefit-related reasons, and a driver's license or bank account isn't one of them (SSA POMS RM 10211.615). For banking, federal rules let a bank accept a passport number from a noncitizen (31 CFR 1020.220, eCFR), and taxes can use an ITIN if needed.
What this means for you
- Work on campus up to 20 hours a week in term, full-time on breaks.
- Make sure the job counts as on-campus under the regulation.
- Get a DSO letter and a pay slip or employer letter before going to SSA.
- Wait about 10 days after arriving before applying.
- Off-campus work needs CPT or OPT first.
Where to start
Students planning beyond OPT often look at options that don't depend on the H-1B lottery. Our free evaluation at /evaluate/ checks whether O-1, EB-1A or the NIW fits your profile, and Frank, our AI assistant at /frank, helps you build the evidence. Petitions are reviewed and filed by our partner law firm, Lai & Turner. Our guide to a green card while on F-1 or OPT covers the timing.
Sources
All checked November 2, 2026.
- 8 CFR 214.2(f)(9)(i) (eCFR, current text). On-campus employment; 20 hours; full-time on breaks; 30 days before classes.
- SSA POMS RM 10211.240. F-1 work types and evidence; OPT EADs.
- SSA POMS RM 10211.245. On-campus employment evidence; 30-day start.
- USCIS, SAVE Fact Sheet for Students. 10-day wait.
- SSA POMS RM 10211.615. Invalid nonwork reasons.
- 31 CFR 1020.220 (eCFR, current text). Bank ID numbers for non-U.S. persons.
Frequently asked questions
Can F-1 students get an SSN?
Only with work authorization and, for on-campus jobs, proof of the job. SSA's manual says an F-1 student needs evidence of nonimmigrant status, the I-20, and evidence of on-campus employment, such as a DSO letter with a pay slip or employer letter. Students on OPT use their EAD. Without a qualifying job, SSA generally won't issue a number.
How many hours can an F-1 student work on campus?
Up to 20 hours a week while school is in session, under 8 CFR 214.2(f)(9)(i). Students may work on campus full-time when school is not in session or during the annual vacation. The 20-hour limit can be suspended only through a Federal Register notice in emergent circumstances.
What counts as on-campus employment for F-1?
Work on the school's premises, including commercial firms that serve students on campus, like the bookstore or cafeteria. It can also be at an off-campus location educationally affiliated with the school, tied to the curriculum or funded post-graduate research. A construction company building on campus doesn't count, because it doesn't provide direct student services.
What letters do I need for an F-1 SSN?
SSA accepts two options: a letter from your Designated School Official plus either a recent pay slip or an employer letter, or one employer letter that includes the required DSO information and is signed off by the DSO. You also bring your passport, I-94 and I-20. Ask your international office for its SSN letter.
When can a new F-1 student start working on campus?
SSA's manual says a new F-1 student may start general on-campus employment up to 30 days before classes begin, so it's possible to get an SSN in the summer before classes if the evidence requirements are met. The regulation also says new students can't begin on-campus work more than 30 days before classes start.
Green Card Guide AI is not a law firm and this article is not legal advice. It describes evidence-building strategy in general terms; your attorney determines what belongs in your petition and how it's argued.
