ITIN for F-1 OPT Students: Post-Study Work Tax Guide

When Do F-1 OPT Students Need an ITIN Instead of an SSN?

OPT (Optional Practical Training) provides work authorization, and work authorization unlocks SSN eligibility. The Social Security Administration typically issues an SSN within 2 to 4 weeks of an in-person application. An ITIN becomes necessary when:

• The SSN application is delayed past the tax filing deadline.
• The student has taxable scholarship, fellowship, or stipend income separate from OPT employment.
• The student receives 1099 income from an independent contracting role before the SSN arrives.
• The student needs to file a spouse or dependent on the same tax return (the spouse may need their own ITIN).

For the broader F-1 path see the ITIN for F-1 visa holders page.

How Does Form 8843 Apply to F-1 OPT Students in 2026?

Form 8843 is the Statement for Exempt Individuals. Every F-1 student must file it by April 15 regardless of income. The form establishes non-resident status under the substantial presence test and exempts the student from US residency for tax purposes during the first 5 calendar years on F-1. OPT students file Form 8843 alongside Form 1040-NR (when they have income) and enter the ITIN or SSN at the top of both forms.

What Tax Treaties Reduce F-1 OPT Withholding?

The US has income tax treaties with 67+ countries. Treaties cover three F-1-relevant categories:

• Student wages: Several treaties (India, China, Korea) provide a partial exemption on student wages.
• Scholarships and grants: Many treaties make qualified scholarships fully exempt from US tax.
• Independent services: Treaty rates for independent contractor income range from 0% to 15% depending on country.

To claim a treaty rate, submit Form W-8BEN to the payer with the ITIN or SSN. Without a tax ID, the default 30% withholding applies.

How Does FICA Exemption Work for F-1 OPT Students?

F-1 students remain exempt from Social Security and Medicare (FICA) taxes for the first 5 calendar years in the United States, as long as they continue to qualify as non-residents under the substantial presence test. The exemption covers OPT employment, on-campus employment, and any other F-1-authorized work.

If an employer withholds FICA in error, the student first requests a refund from the employer. If the employer refuses, the student files Form 843 and Form 8316 with the IRS, attaching W-2 and visa documentation.

How Do F-1 OPT Students Apply for an ITIN?

1. Complete Form W-7 with reason code “f” (non-resident alien student or trainee on a US tax treaty) or “h” (other) depending on situation.
2. Attach a federal tax return (Form 1040-NR) unless an exception applies. Scholarship-only exceptions allow filing without a return.
3. Include a current passport (the only standalone document) or two IRS-accepted documents.
4. Include a letter from your Designated School Official (DSO) if the application is for scholarship income.
5. Mail to the IRS ITIN Operation in Austin or submit through a Certifying Acceptance Agent.

For broader student guidance see the ITIN for international students page.