F-1 Student Visa Tax Guide 2026: FICA Exemption, OPT Tax, Treaty Benefits and Filing

International students on F-1 visas occupy a special position in the US tax system. Unlike work visa holders (H-1B, L-1, O-1), F-1 students are exempt from the Substantial Presence Test for their first 5 calendar years in the US — meaning they are treated as nonresident aliens regardless of how many days they spend in the country. This nonresident status carries significant tax advantages, including exemption from FICA taxes, simpler worldwide income reporting rules, and eligibility for certain tax treaty benefits.

However, the rules change as students progress through their academic career and into OPT or STEM OPT work authorisation, and change again entirely when they transition to H-1B status. Understanding the 5-year clock, how scholarships and fellowships are taxed, which tax treaties apply to wages and stipends, and what happens in the dual-status year when switching to H-1B is essential for any international student in the US.

F-1 Nonresident Alien Status and the 5-Year Rule

F-1 students are classified as 'exempt individuals' under the Substantial Presence Test (SPT) for their first 5 calendar years in the US. Days spent in the US as an F-1 exempt individual are not counted for SPT purposes. This means:

• A student who arrives on August 20, 2022 begins counting their 5-year exempt period from calendar year 2022 — not from August 20.
• The 5-year clock runs on calendar years (2022, 2023, 2024, 2025, 2026 = 5 years), so from January 1, 2027, they are no longer exempt.
• If the student has been in the US for more than 183 days in 2027 (or meets the 3-year weighted SPT formula), they will become a resident alien starting in 2027.

During the exempt nonresident period, F-1 students are taxed only on US-source income — primarily wages from on-campus jobs, internships, or CPT/OPT employment. Foreign-source income (income from a home country bank account, foreign dividends) is generally not taxable in the US during the nonresident period. This is a significant advantage over H-1B workers who must report worldwide income immediately.

FICA Exemption for F-1 Students — How It Works

While an F-1 student is a nonresident alien under the SPT exemption, they are exempt from FICA (Social Security and Medicare taxes). This is codified in IRC sections 3101, 3111, and 3121(b)(19). The employer should not withhold Social Security (6.2%) or Medicare (1.45%) from a qualifying F-1 student's wages.

Key rules around the FICA exemption:

• The exemption applies to wages from on-campus employment, as well as CPT (Curricular Practical Training) and OPT (Optional Practical Training) positions — so long as the student remains a nonresident alien.
• The FICA exemption ends when the student becomes a resident alien — either by exceeding the 5-year exempt period, or by making a First-Year Choice election to be treated as a resident.
• If your employer incorrectly withholds FICA, you can file Form 843 to claim a refund of improperly withheld Social Security and Medicare taxes.
• The FICA exemption does not apply to self-employment income — a nonresident alien who is self-employed may still be subject to self-employment tax on effectively connected income.

For a student earning $25,000 per year, the FICA saving is approximately $1,912 per year — significant for students on tight budgets.

OPT and STEM OPT: Tax Treatment During Work Authorisation

Optional Practical Training (OPT) and STEM OPT are work authorisation periods that allow F-1 students to work in the US for 12 months (OPT) or up to 36 months (STEM OPT) after completing their degree. The tax treatment during OPT and STEM OPT depends on whether the student is still a nonresident alien:

• If still within the 5-year exempt period: The student remains a nonresident alien, continues to file Form 1040-NR, remains FICA-exempt, and only US-source income is taxable.
• If the 5-year period has ended: The student may become a resident alien under the SPT in the OPT year, meaning they must file Form 1040, pay FICA, and report worldwide income. The exact timing depends on day counts.

A common scenario: a student who started in Fall 2022 completes their degree in May 2026 and begins OPT in June 2026. By 2026, they have used their 5 exempt calendar years (2022-2026). In 2026, the SPT may or may not apply depending on day counts — but in 2027, if they are still on STEM OPT, they will likely be a resident alien.

Some F-1 students on OPT receive a Form 1099-MISC or 1099-NEC rather than a W-2, indicating their employer treats them as an independent contractor. This has tax implications: self-employment tax (15.3%) may apply, and the FICA exemption rules interact differently with self-employment income.

Tax Treaties That Benefit F-1 Students

The US has income tax treaties with over 65 countries, and many treaties contain specific provisions benefiting students and trainees. Key treaties for common F-1 nationalities:

To claim treaty benefits as an F-1 student, you complete Form 8233 (for wages exempt from withholding) or claim the exemption on Form 1040-NR. Not all states honour federal tax treaty benefits — California, for instance, does not recognise most tax treaty exemptions for state income tax purposes.

Scholarships and Fellowships: What's Taxable

The taxability of scholarships and fellowship grants for F-1 students depends on how the money is used:

• Tuition and required fees: Excluded from income under IRC section 117 — not taxable for any student (resident or nonresident).
• Room and board, stipends, living expenses: Taxable as US-source income for F-1 students. A doctoral student receiving a $30,000 stipend may have $15,000-$20,000 taxable after tuition exclusions.
• Teaching/research assistantships (wages): Fully taxable as compensation — these are employment income, not scholarships. Subject to income tax withholding (14% flat rate for nonresident aliens unless a treaty applies).

The university typically withholds 14% federal income tax on taxable scholarships and fellowship income paid to nonresident aliens (unless a treaty exemption applies). F-1 students must file Form 1040-NR to either confirm this is correct or claim a refund if overwitheld. Many F-1 students are entitled to refunds — particularly in their first year when they arrive partway through the year.

Transitioning to H-1B — The Dual-Status Year

The year an F-1 student changes to H-1B status is one of the most complex tax years they will face. Assuming the 5-year F-1 exemption has been used:

• First portion of the year (F-1 OPT): Nonresident alien — file 1040-NR, FICA exempt, US-source income only taxable.
• After H-1B start date: Resident alien — worldwide income taxable, FICA begins, standard deduction available.
• Filing requirement: A dual-status return (Form 1040 + 1040-NR statement) is required for this year.

One important consideration: in the H-1B year, if the student had FICA-exempt OPT earnings in the first part of the year, the employer should stop withholding FICA from the H-1B start date (not from January 1). Retroactive FICA corrections may be needed if the employer does not adjust correctly at the H-1B start.

The cap-gap extension (the period between the end of OPT and the October 1 H-1B start date) is particularly complex. Students in cap-gap remain F-1/OPT nonresidents during this period, meaning FICA exemption continues until the H-1B is activated.