Employment & Taxes Employment & Taxes Employment & TaxesOn-Campus EmploymentCurricular Practical Training (CPT)Optional Practical Training (OPT)Pre-Completion OPTPost-Completion OPTSTEM OPT ExtensionSocial Security NumberTax Obligations On-CampusEmployment Curricular PracticalTraining (CPT) Optional PracticalTraining (OPT) Pre-CompletionOPT Post-Completion OPT Social Security Number (SSN) STEM OPT Extension Tax Obligations