PhD Stipend for International Students: Is It Taxable, How Withholding Works, and the F-1 Work Rules

Your PhD stipend is probably taxable, but how much gets withheld depends on whether it is a fellowship or an assistantship, your tax residency and your treaty country.

Yes, a PhD stipend is usually taxable in the US, including for international students on an F-1 visa. Funding that pays tuition and required fees is generally tax-free; the living-expense stipend is taxable. How it is withheld depends on the type: a fellowship (no work required) is reported on Form 1042-S, while an assistantship (teaching or research work) is paid as wages on a W-2. As an F-1 nonresident you are generally exempt from Social Security and Medicare tax, and a tax treaty may cut the bill further. Your F-1 status then decides, separately, how much you can work.

Status as of October 14, 2026. The tax rules below are long-standing IRS rules. The DHS Duration-of-Status rule is blocked by a 2026-09-14 court order (Presidents' Alliance v. DHS); DHS has appealed, but the appeal does not revive the rule, so D/S and the 60-day F-1 grace period still apply. SEVP's August 2026 CPT guidance is in effect and challenged (hearing 2026-11-06). The OPT fee rule ($70,000 initial, $30,000 subsequent) is proposed, with comments closing 2026-11-09.

This is not tax or legal advice. Route tax questions to your university's nonresident tax office or a preparer who handles Form 1040-NR, and F-1 questions to your DSO.

Is a PhD stipend taxable? The three funding types

Most PhD packages combine pieces the IRS treats differently. The department's label does not decide the tax treatment; what matters is whether the money pays tuition, pays you to live, or pays you for work. The table reflects long-standing IRS rules as of October 2026.

The key line from IRS Publication 970 is that a qualified scholarship covers tuition, required fees, and books, supplies and equipment required for your courses. Room, board, travel and general living costs are not qualified expenses. That is why your tuition waiver is usually invisible on your tax return, while your monthly stipend is not. For nonresidents, IRS Publication 519 adds a source rule: a scholarship or fellowship is generally sourced by the residence of the payer, which is why a home-country government award can be treated differently from a US one.

If a payment is in exchange for work, it is compensation, whatever the department calls it. Check your appointment letter for "service", "duties" or "hours".

How PhD stipend tax withholding works for F-1 students

Fellowship stipends: Form 1042-S

If you are a nonresident alien for tax purposes, the taxable part of a fellowship or scholarship is subject to withholding under the nonresident rules. Under IRS Publication 515, the rate for students in F, J, M or Q status is 14%, rather than the general 30% rate on many other payments to nonresidents. The university reports the payment and any withholding on Form 1042-S, usually in the spring after the tax year.

Withholding is not the final bill. Your liability is calculated on Form 1040-NR, so you may get a refund or owe more. And if an outside funder pays you directly, nobody may withhold at all; you still owe the tax.

Assistantship pay: Form W-2

TA and RA pay is wages, run through payroll with graduated withholding based on your Form W-4. Nonresident aliens follow special W-4 instructions (IRS Notice 1392) and, for most countries, get no standard deduction. India is a well-known exception because of a treaty provision for students. Your W-2 arrives in January.

Tax treaties

Many US income tax treaties include articles for students, trainees, teachers or researchers. Some exempt a fixed amount, some cover teaching and research pay for a limited number of years, and some cover nothing relevant to a PhD student. Check the IRS tax treaty page and your school's nonresident tax office.

Claiming a treaty benefit at the source is a paperwork step:

• Fellowship or scholarship income: Form W-8BEN to the payer.
• Pay for services (TA or RA wages): Form 8233 to the payer, renewed each tax year.
• Both from the same university: Publication 515 lets a recipient of wages and a fellowship from the same institution claim both exemptions on Form 8233.

Many universities collect these through nonresident tax software such as Glacier or Sprintax. If you claim a treaty on your return instead, you may also need Form 8833. The broader tax guide for international students covering FICA and treaties has the full picture.

FICA: Social Security and Medicare

While you are a nonresident alien in F-1 status, wages for on-campus employment, CPT and OPT are generally exempt from Social Security and Medicare taxes. Fellowship stipends are not wages, so FICA never applies to them. If your paystub shows FICA withheld while you are a nonresident, raise it with payroll.

When the rules flip: your residency status

Nonresident status is not permanent. F-1 students are "exempt individuals" under the substantial presence test for 5 calendar years, and any part of a year in F-1 or J-1 student status counts as a full year. Earlier US study counts too, so a long PhD, or a PhD after a US master's, can make you a resident alien for tax purposes even though your visa did not change.

You then file Form 1040 instead of 1040-NR, are taxed on worldwide income, and FICA may apply to wages not covered by the separate student exception for work at your own university. Some treaty benefits survive the switch. The mechanics, including how days are counted, are in our guide to the substantial presence test and tax residency.

The F-1 work rules behind your stipend

The IRS asks whether a payment is compensation. SEVP asks whether you are working, and whether that work is authorized.

Assistantships are on-campus employment

TA and RA positions are on-campus employment, which F-1 students may do without USCIS authorization. During the academic session, on-campus work is limited to 20 hours per week in total across all campus jobs; during official breaks, full-time on-campus work is generally allowed if you are continuing your studies. A 20-hour assistantship leaves no room for a second campus job during term. Official guidance lives on Study in the States.

Fellowships generally are not employment

A pure fellowship with no service requirement is funding, not a job, and does not use your on-campus hours. Awards that mix the two exist, so ask your DSO how yours is classified.

Summer internships off campus mean CPT

A summer at an industry lab is off-campus work and requires authorization, usually CPT. As of October 2026, SEVP's CPT broadcasts (BCM 2608-01 and 2608-02) are in effect as guidance and challenged in AAU v. DHS, and some schools have paused or tightened CPT. No CPT arrangement is automatically safe or banned; only your DSO can authorize it. See what PhD students should check about Day 1 CPT.

Your stipend is on your I-20

Your I-20 lists your funding as financial evidence. If it changes significantly (a lost assistantship, a new advisor or award), tell your DSO, who may need to update your record.

Average PhD stipend in the USA: why the number misleads

There is no single reliable average PhD stipend in the USA; published surveys mix fields, institutions and 9-month versus 12-month appointments. Compare take-home pay instead:

• 12-month or 9-month funding? A 9-month stipend without summer support is a much smaller annual income.
• Fellowship or assistantship? The withholding mechanics differ, and so does how much you can work.
• Your treaty country. A relevant treaty article can leave you more than a labmate from a non-treaty country.
• Mandatory fees and health insurance. Some programs cover them, others deduct them.
• Cost of living and state income tax, which varies by state.

Step by step: from funding letter to tax return

1. Read your appointment letter. Separate tuition, fellowship stipend and assistantship pay, and note any service requirement.
2. Complete your school's nonresident tax intake, usually in Glacier, Sprintax or a similar system, so the school can assess residency and treaty eligibility.
3. Submit treaty forms if eligible. W-8BEN for fellowship income, 8233 for wages, and resubmit each year.
4. Fill out the W-4 using nonresident instructions if you have assistantship pay.
5. Check your first paystub. Look for FICA withholding that should not be there and confirm the treaty exemption applied.
6. Collect your forms. W-2 in January, 1042-S usually by mid-March.
7. File Form 8843 every year, even with no income. Our Form 8843 guide covers who files and why.
8. File Form 1040-NR (or 1040 once you are a resident) by the IRS deadline for that year. If you had a fellowship with no withholding, plan for a balance due.

After the PhD: from stipend to salary

Industry offers on OPT or STEM OPT are ordinary wages, and the unemployment limits are unchanged as of October 2026: 90 days on post-completion OPT, 150 days in total with the 24-month STEM extension. Universities, their affiliated nonprofits, and nonprofit or government research organizations are exempt from the annual H-1B cap, which is why many postdoc roles do not go through the lottery. Our PhD to industry transition and H-1B sponsorship strategy lays out the sequencing. The $70,000 / $30,000 OPT fee is only proposed; if finalized, the school would be the legal payer (and could pass the cost on), and it would apply only to DSO recommendations dated 60 or more days after a final rule.

Common mistakes

• Assuming "stipend" means tax-free. Only qualified tuition and required fees are generally excluded.
• Using resident tax software for a nonresident return. Most consumer software is built for Form 1040, not 1040-NR.
• Ignoring an outside fellowship with no withholding. If it is taxable, the tax is still owed at filing time.
• Forgetting that treaty forms expire. Form 8233 is annual, and a treaty may cap the number of years you can use it.
• Missing the residency switch. Once your exempt years run out, a 1040-NR may be the wrong return.
• Taking side income off campus. Off-campus tutoring, freelancing or gig driving without authorization is unauthorized employment for an F-1 student. Ask your DSO before earning anything outside your assistantship.

Frequently asked questions

Is a PhD stipend taxable for international students on an F-1 visa?

Usually yes. Funding that pays tuition and required fees is generally excluded from income, but the living-expense stipend is taxable whether it is a fellowship or assistantship pay. A tax treaty with your home country may reduce or remove the tax on some of it.

Do F-1 PhD students pay Social Security and Medicare tax on a stipend?

Generally not while you are a nonresident alien for tax purposes. Fellowship stipends are not wages, and on-campus assistantship wages paid to F-1 nonresidents are exempt from FICA. Once you become a tax resident the analysis changes, although a separate student exception may still cover work for your own university while enrolled.

Can a tax treaty make my PhD stipend tax-free?

Sometimes. Many US tax treaties have articles for students, teachers or researchers that treat fellowship income and pay for services differently. A treaty is usually claimed on a fellowship with Form W-8BEN and on wages with Form 8233, through your university's nonresident tax office.

Does a fellowship count toward the 20-hour on-campus work limit?

A fellowship with no service requirement is generally treated as funding rather than employment, so it does not use your on-campus hours. A teaching or research assistantship is on-campus employment and does count. If your award mixes the two, ask your DSO how it is classified.

What is the average PhD stipend in the USA?

There is no single reliable national average, because stipends vary widely by field, institution, city and funding source. Compare take-home pay after tax, mandatory fees and health insurance, and check whether the stipend covers 9 months or 12.

Sources

• IRS, Publication 515, Withholding of Tax on Nonresident Aliens
• IRS, Publication 519, U.S. Tax Guide for Aliens
• IRS, Publication 970, Tax Benefits for Education
• IRS, Tax treaties
• IRS, About Form 8843
• ICE SEVP, Broadcast Message 2101-01 on OPT unemployment
• DHS, Study in the States, information for students
• Presidents' Alliance v. DHS, order of 2026-09-14

When you are ready to turn a PhD into a sponsored industry or research role, F1Jobs can help you plan the job search around your OPT, STEM OPT and H-1B timeline.