12-Month vs 9-Month PhD Stipends: How Summer Funding Works
By Muntasir Minhaz • Published Aug 19, 2026
Most PhD stipends in the US pay for nine months, the fall and spring semesters, not the full year. You need to arrange your own summer funding through a summer teaching assistantship, a research assistantship paid from your advisor's grant, a fellowship, or an internship.
💵 A 9-month PhD stipend leaves June through August unfunded unless you arrange something else.
🎓 Some schools, like Duke, now guarantee 12-month funding for PhD students in their guaranteed-funding years.
📩 Summer fellowship applications often open in late winter or early spring, months before summer starts.
🛂 On-campus summer work stays within your F-1 status. Off-campus paid work needs separate authorization.
Why PhD stipends often stop paying in May
A 9-month stipend covers the two semesters of the academic year, roughly late August through early May. It exists because most funding tied to a PhD comes from teaching assistantships or fellowships built around the academic calendar. When classes end, the university's obligation to pay you as a teaching assistant ends too.
Research assistantships work differently. If your advisor pays you from a grant, that grant funds you through the summer if it has money allocated and your advisor chooses to use it that way. This is why summer funding often depends more on your advisor's grant situation than on a university-wide policy.
What the gap costs you
A 9-month appointment leaves three to four months, typically June through August, with no guaranteed paycheck. If you're on F-1 status, your options for closing that gap are narrower than for a US citizen. On-campus work stays within your status without extra paperwork. Paid work off campus generally requires specific authorization such as CPT, so check with your international student office before agreeing to any paid work outside the university over the summer.
How some universities have closed the 9-month gap
A growing number of graduate schools now guarantee full-year funding instead of leaving students to patch together summer income. Duke moved all PhD students in their five-year guaranteed-funding period to 12-month stipends starting in the 2022-23 academic year, drawing on the Graduate School, the Provost's Office, and individual departments to cover the summer months (Duke Graduate School ). Northwestern pays its funded PhD students year-round rather than only during term (Northwestern Graduate School ).
Other schools keep the 9-month structure but set a minimum. UNC-Chapel Hill's minimum PhD stipend for 2024-25 was $20,600 for a nine-month service period, rising to $21,168 for 2025-26 (UNC Graduate School ). That minimum covers the academic year only. Summer pay at UNC and similar schools comes from a separate assistantship, fellowship, or grant, not automatically from the same stipend line. Cornell structures summer support at the program level rather than university-wide: some departments offer summer stipends that carry the same conditions as academic-year awards, so check with your specific program rather than the general graduate school page (Cornell Graduate School ).
How fellowship stipends can differ from assistantship pay
If your primary funding is a fellowship rather than a teaching or research assistantship, check its exact award period before assuming it covers all twelve months. Some external fellowships publish a defined stipend period that already includes summer, while university-internal fellowships sometimes mirror the academic year only. Read the actual award letter, not just the program's general fellowship description, since the same-named award can carry different terms across cohorts.
Negotiating funding before you accept an offer
If a program's summer funding is not guaranteed, it is reasonable to ask the department to put a plan in writing before you accept, rather than trusting a verbal statement that students usually find something. Some departments respond by offering a specific summer teaching assistantship slot, a bridge fellowship, or a written commitment from your prospective advisor to cover a defined number of summer weeks from grant funds. Getting this in writing protects you if staff or funding priorities change between your offer and your first summer.
Where summer funding actually comes from
If your program doesn't guarantee 12-month pay, expect to assemble your own summer funding from one or more of these sources.
A summer teaching assistantship, if your department offers summer courses.
A research assistantship paid from your advisor's grant, if the grant has summer funds allocated.
A departmental or graduate school summer fellowship. At Duke, first- and second-year students get notified around the start of March to apply for the following summer's research fellowship (Duke Graduate School ). Deadlines like this are common elsewhere too, so check your program's calendar well before spring.
An external fellowship such as the NSF Graduate Research Fellowship, which pays a stipend that continues through the summer for its award years.
A summer internship, if your visa status and program allow it. Confirm with your DSO before accepting any paid position outside the university.
Questions to ask before you accept a PhD offer
Ask these directly during a funding conversation with your program, not after you've enrolled.
Is my stipend a 9-month or 12-month appointment?
Is summer funding guaranteed for every year of my program, or only some years?
If summer funding isn't guaranteed, what's the department's typical placement rate for students who need it?
What's the deadline to apply for summer fellowships or assistantships?
Does my prospective advisor's grant currently cover summer research assistant pay?
Get the answers in writing where you can, ideally in your offer letter or a follow-up email from the graduate program coordinator. A verbal assurance about summer funding is harder to act on later than a written one.