What is a Social Security Number? 
All U.S. employers require employees to have a Social Security Number (SSN).  A Social Security Number (SSN) is required to receive compensation for work in the US (F-1 on-campus employment, paid internship, Optional Practical Training (OPT). The Social Security Number is a permanent ID number issued by the U.S. government. 

When can I apply for a Social Security Number?
You may apply for a SSN only if you have received a job offer. You must have entered the U.S. at least 10 days prior to submitting your application. You may not apply more than 30 days before the start of your job. 

How Can I Apply for a Social Security Number?

• Complete the online SSN Application from the Social Security Administration website.
• Print the confirmation receipt
• Take the receipt and required documents (listed below) to any US Social Security office during regular business hours; and
• Allow at least two weeks for processing and mailing.

Present the following documents when you apply for a Social Security Number:

• Printed confirmation receipt of SSN application
• Original Passport with F-1 visa
• I-94 Arrival/Departure Record (printed from the cbp.gov website)
• Original Form I-20
• Original supervisor or job offer letter (See Sample Employer Letter) 
• For on-campus jobs only, complete the "International Student On-Campus Employment - Confirmation of Job Offer". It must be signed by your campus supervisor and a DSO in the Office of International Services
• For OPT only, EAD card
• Lasell Student ID card

Additional Resources for Students:

Social Security Administration Office Locator
International Students and Social Security Numbers- From the Social Security Administration

Resources for Employers:
Social Security Guidance for Employers Hiring Foreign Nationals 
Sample Employer Letter