PhD stipends are taxed as income, but the rules depend on whether you receive a fellowship or work as a teaching or research assistant

The IRS treats different types of PhD support differently. If you receive a fellowship or scholarship that pays for tuition and required fees, that portion is not taxed. But any amount that goes toward living expenses — room, board, books, supplies — counts as taxable income. If you work as a teaching assistant (TA) or research assistant (RA), your entire stipend is taxed as wages, just like any other job.

The distinction matters because it changes what form you file and what taxes you owe. A fellowship stipend of $20,000 might result in $0 tax if it all covers tuition, or $3,000 to $4,000 in federal tax if it covers living expenses. A TA stipend of $20,000 is almost always fully taxable. Your university should tell you which category your stipend falls into, but you need to verify this on your own tax forms because the university's classification is not always correct.

Key Takeaways

  • Fellowship and scholarship stipends are taxed only on the portion used for living expenses, not on amounts that pay tuition or required fees.
  • TA and RA wages are fully taxable income and require you to file Form 1040 and pay self-employment tax if you are not a university employee.
  • Your university issues a Form 1098-T (for scholarships) or Form W-2 (for wages), but you must verify the amounts match your actual stipend.
  • Graduate students often owe taxes even though no money was withheld, so you may need to make quarterly estimated tax payments or file a return to settle what you owe.
  • State tax rules vary widely — some states tax fellowship income and some do not, so check your state's rules separately from federal rules.

Fellowship and scholarship stipends: what portion is taxable

A may have access to scholarship under IRS rules is tax-free only when it pays for tuition, fees, books, supplies, and equipment required for your degree. The moment the money goes toward room, board, transportation, or personal expenses, it becomes taxable income. Many universities bundle these together into one stipend payment, so you have to split it yourself.

Start with your university's cost of attendance (COA) for your program. This is a number your financial aid office publishes and includes tuition, fees, room, board, books, and supplies. Subtract the tuition and required fees. What remains — usually room, board, and books — is the taxable portion of your stipend. If your stipend is $24,000 per year and tuition plus fees is $18,000, then $6,000 is taxable income.

Your university will report the scholarship portion on Form 1098-T, but this form often includes amounts that should not be there. Check the amounts yourself. If the form says your entire $24,000 stipend is a may have access to scholarship, but $6,000 of it covers room and board, the form is wrong. You still owe tax on the $6,000, and you will need to report this correctly on your tax return even if the 1098-T does not.

TA and RA wages: fully taxable income

If you work as a teaching assistant, research assistant, or graduate assistant, your entire stipend is taxable wages. The university does not get to call it a scholarship just because you are a student. The IRS sees it as payment for work performed.

Your university should issue you a Form W-2 showing your wages. If you earned $20,000 as a TA, all $20,000 is taxable. You will owe federal income tax on this amount, and depending on your state, state income tax as well. You may also owe self-employment tax (Social Security and Medicare) if the university did not withhold it — this is common for graduate assistants who are not classified as regular employees.

The key question is whether your university treats you as an employee. If you receive a W-2, you are an employee and the university withheld taxes. If you receive a 1099-NEC or 1099-MISC, you are an independent contractor and you owe the full self-employment tax (15.3% combined) on top of income tax. Ask your graduate program coordinator which form you will receive before the tax year ends, so you can plan for what you owe.

When your university issues the wrong form

Universities sometimes misclassify stipends. A TA might receive a 1098-T instead of a W-2. A fellowship might be reported as a W-2 when it should be a scholarship. This creates confusion and can lead to you underpaying or overpaying taxes.

If you receive a form you believe is wrong, contact your university's tax office or graduate financial services office when ready. Ask them to issue a corrected form before the filing important date. If they refuse or say they cannot, you can still file your return correctly based on what you actually received. The IRS will match your return to the form the university filed, so you may need to include a written explanation with your return or be prepared to respond to a notice later.

Do not assume the form is correct just because it came from the university. You are responsible for reporting your income accurately, regardless of what form you receive.

Federal income tax withholding and what you actually owe

If you receive a W-2, your university may have withheld federal income tax from your stipend. If you receive a 1098-T or no form at all, no tax was withheld. Either way, the amount withheld often does not match what you actually owe.

Graduate students frequently owe taxes because their stipend is their only income and they claim zero withholding, or because the withholding was calculated for a full-time employee earning year-round when you only worked part of the year. You might owe $2,000 to $4,000 at tax time even though you received a stipend of $20,000.

To avoid a large bill in April, calculate what you owe now. Take your taxable stipend amount, subtract the standard deduction (for 2024, $14,600 for a single filer), and multiply the remainder by your tax bracket (usually 12% for graduate students). If you owe more than $1,000, consider making quarterly estimated tax payments to the IRS using Form 1040-ES. This spreads the payments across the year instead of one lump sum in April.

State income tax on PhD stipends

State tax rules vary significantly. Some states tax all stipend income. Some states exempt scholarship and fellowship income entirely. Some states tax only the wages portion (TA/RA) and not the fellowship portion. You must check your state's rules separately from federal rules.

If you live in a state with no income tax (Texas, Florida, Tennessee, and others), you owe no state tax on your stipend. If you live in a state with income tax, your university may or may not withhold it. Many universities withhold federal tax but not state tax, leaving you to pay the state bill yourself. Contact your state's department of revenue or your university's tax office to confirm what you owe.

If you moved states during the year — for example, you started your PhD in one state and moved to another — you may owe tax to both states on a prorated basis. This is complicated and often requires filing in two states. A tax professional familiar with graduate student taxes can help you sort this out.

Self-employment tax for graduate assistants

If you receive a 1099-NEC or 1099-MISC instead of a W-2, you are classified as an independent contractor. You owe self-employment tax of 15.3% (12.4% for Social Security and 2.9% for Medicare) on your net earnings. This is in addition to regular income tax.

Self-employment tax is calculated on Schedule SE and added to your Form 1040. For a $20,000 stipend, self-employment tax alone could be $2,800 to $3,000. This is a significant amount and often comes as a shock to graduate students who did not expect it.

If your university classifies you as an independent contractor, ask whether they can reclassify you as an employee instead. Many universities do this when asked, because it is simpler for both parties. If they refuse, you must pay the self-employment tax. You cannot avoid it by not reporting the income — the university files a 1099 with the IRS, and the IRS will notice if you do not report it.

Frequently Asked Questions

Do I have to file a tax return if my only income is a PhD stipend?

Yes, if your taxable income exceeds the standard deduction for your filing status. For 2024, a single filer with a standard deduction of $14,600 must file if their income is $14,600 or more. A PhD stipend of $20,000 with $6,000 taxable (the non-tuition portion) is below the threshold, so you might not have to file. But if you had taxes withheld, you should file to get a refund.

Can I deduct my tuition as a student loan interest deduction or education credit?

Only if you paid the tuition yourself with your own money. If your stipend or scholarship paid the tuition, you cannot claim a credit or deduction on the same tuition. The IRS does not let you benefit twice from the same dollar. However, if you paid tuition out of pocket beyond what your stipend covered, you may be able to claim the American Opportunity Tax Credit or Lifetime Learning Credit on the excess.

What if my stipend is paid in a lump sum instead of monthly?

The tax treatment is the same — the entire amount is income in the year you receive it, regardless of when you actually spend it. If you receive $24,000 in August for the academic year, all $24,000 is taxable in that year, not split across two calendar years. This can push you into a higher tax bracket if you also have other income.

Do I owe taxes on a stipend I received but did not actually use?

Yes. The IRS taxes income when you receive it, not when you spend it. If your university paid you a $20,000 stipend but you only spent $15,000, you still owe tax on the full $20,000. The unused portion is your money to keep or save.

What happens if I disagree with my university's Form 1098-T or W-2?

Request a corrected form (Form 1098-T-C or W-2-C) from your university's tax office. If they refuse or cannot issue one, file your return based on what you actually received and include a written explanation. Keep copies of your stipend agreement, award letter, and any emails from your university documenting what the stipend covers. If the IRS contacts you, these documents support your position.