You can defer federal student loans while you’re in grad school as long as you’re enrolled at least half-time at an eligible school, and for most borrowers the deferment happens automatically without any paperwork. It covers Direct Subsidized and Unsubsidized Loans, FFEL loans, Perkins Loans, and Grad PLUS Loans, including any balances left over from undergrad.1Federal Student Aid. Student Loan Deferment Whether letting that deferment run is the right financial move is a separate question, and the answer turns on your loan mix, your income, and whether you’re chasing loan forgiveness.
Who Qualifies and Which Loans Are Covered
The eligibility rule is simple: at least half-time enrollment at a school that participates in federal student aid under Title IV. Your program defines what half-time means in credit hours, and there is no cumulative cap on how long in-school deferment can last. It runs as long as you stay enrolled at the required level.1Federal Student Aid. Student Loan Deferment
Federal loans that qualify include Direct Subsidized and Unsubsidized Loans, FFEL Program loans, Perkins Loans, and Grad PLUS Loans.1Federal Student Aid. Student Loan Deferment
Private student loans are a different matter. Private lenders write their own rules, and while some offer academic deferment, the terms depend on your specific loan contract. You’ll have to ask each private lender directly.
How the Deferment Actually Gets Applied
Most graduate students never fill out a form. Schools report enrollment to the National Student Loan Data System through enrollment reporting servicers, that data flows to your loan servicer, and your loans go into deferment automatically. Expect to see the status change in your servicer’s online portal roughly 30 to 60 days after the semester starts.1Federal Student Aid. Student Loan Deferment
If it doesn’t kick in, start with your school’s registrar so they can push or correct your enrollment data. If that doesn’t fix it, submit the In-School Deferment Request form to your servicer. You complete your section, then an authorized school official certifies your enrollment and expected graduation date.2Federal Student Aid. In-School Deferment Request A deferment can be applied retroactively, but no more than six months before the servicer receives the request.3Federal Student Aid – U.S. Department of Education. Grace Periods, Deferment, and Forbearance in Detail
Keep Paying Until It’s Confirmed
Here’s the trap. You still owe your regular payment until the servicer formally confirms the deferment. Stop paying while the request is in limbo and your account can go delinquent, with missed payments reported to the credit bureaus.1Federal Student Aid. Student Loan Deferment Once the deferment posts, payments that overlapped with the approved period are typically refunded or credited. Until then, pay.
What Happens to Interest
Deferment pauses payments. It does not always pause interest.
Subsidized Loans
On Direct Subsidized Loans, the government pays the interest during in-school deferment, so the balance stays flat. The catch for graduate students: new Direct Subsidized Loans have not been available for graduate study since July 1, 2012.4Federal Student Aid. Subsidized and Unsubsidized Loans Any subsidized balance you have is leftover undergraduate debt. Everything you borrow for grad school will be unsubsidized or Grad PLUS.
Unsubsidized and Grad PLUS Loans
Interest on these accrues daily whether you’re in school or not.4Federal Student Aid. Subsidized and Unsubsidized Loans You can pay that interest as it accrues if you want to keep the balance from growing. If you don’t, unpaid interest eventually gets added to your principal through capitalization, and from that point forward you pay interest on the larger balance.
When Capitalization Happens
Federal regulations changed in July 2023 to remove several old capitalization triggers, but two remain by statute: when you exit a deferment and when you leave the Income-Based Repayment plan.5U.S. Department of Education. Eliminate Interest Capitalization So the day your in-school deferment ends, all the interest that accumulated on your unsubsidized and Grad PLUS balances gets rolled into principal. Over a two- or three-year program that can add thousands to your total cost. Even small monthly interest-only payments during school prevent the pileup.
When You Might Want to Skip Deferment
Deferment is the default path, and it’s often the right one. Two situations argue the other way.
You’re Pursuing Public Service Loan Forgiveness
Months in in-school deferment generally do not count toward the 120 qualifying payments for PSLF. Qualifying payments have to be made on an income-driven repayment plan or the standard 10-year plan.6Federal Student Aid. What Repayment Plans Qualify for Public Service Loan Forgiveness (PSLF)? If you’re working full-time for a qualifying employer while attending grad school part-time, deferment costs you PSLF credit you could otherwise be earning. On an income-driven plan, a low income can produce a $0 monthly payment, and a $0 payment still counts toward the 120.
Your Income Would Produce a $0 IDR Payment
Income-driven repayment sets your monthly payment based on income and family size. Grad students without significant outside income often calculate to $0 or close to it. The difference between a $0 IDR payment and deferment is that IDR months count toward eventual forgiveness (PSLF at 10 years, or IDR forgiveness at 20 to 25 years) while deferment months typically don’t. Ongoing litigation around the SAVE plan has scrambled which IDR plans are open to new enrollments, so ask your servicer what’s currently available before you switch.
What Happens When You Finish Grad School
Deferment ends when you graduate, leave school, or drop below half-time. Direct Subsidized and Unsubsidized Loans then give you a six-month grace period before payments begin. Grad PLUS Loans get an automatic six-month post-enrollment deferment that works the same way in practice.7Federal Student Aid. Student Loan Repayment
Your servicer will send a repayment schedule before the grace period ends showing your first payment date, monthly amount, and total number of payments. This is the moment unpaid interest capitalizes, so the schedule reflects the larger balance.5U.S. Department of Education. Eliminate Interest Capitalization If the standard 10-year payment is more than you can carry, switch to an income-driven plan before the first bill is due.
Deducting Interest You Pay During Deferment
If you make voluntary interest payments while your loans are deferred, that interest is tax-deductible. You can deduct up to $2,500 per year in student loan interest whether or not you itemize.8Internal Revenue Service. Topic No. 456, Student Loan Interest Deduction The deduction phases out at higher incomes. For 2025 the phase-out starts at $85,000 for single filers and $170,000 for joint filers, and these thresholds adjust for inflation.9Internal Revenue Service. Publication 970 (2025), Tax Benefits for Education Most grad students earning modest incomes during school fall well within the eligible range, which makes those voluntary interest payments a little cheaper after tax.