Yes, both subsidized and unsubsidized federal student loans charge interest, and they do so at the same rate for undergraduates. The real question of whether subsidized or unsubsidized loans charge interest to you comes down to timing: with a Direct Subsidized Loan, the U.S. Department of Education pays the interest during enrollment, your six-month grace period, and approved deferment. With a Direct Unsubsidized Loan, interest accrues daily from the moment the loan is disbursed, and every cent of it is yours to repay.1Federal Student Aid. Subsidized and Unsubsidized Loans Over a four-year degree, that single difference can add thousands of dollars to what you ultimately pay back.
What the Subsidy Actually Covers
Direct Subsidized Loans are available only to undergraduates who demonstrate financial need on the FAFSA. The amount you can borrow cannot exceed the need your school calculates.
The subsidy itself is simple. The federal government pays the interest on your loan during three specific windows: while you’re enrolled at least half-time, during the six-month grace period after you leave school, and during any approved deferment.1Federal Student Aid. Subsidized and Unsubsidized Loans If you make no voluntary payments during those stretches, your principal balance stays frozen. For most borrowers, the balance owed on the first day of repayment is identical to the amount originally disbursed.
What You Owe on an Unsubsidized Loan
Direct Unsubsidized Loans are available to both undergraduate and graduate students, with no financial-need requirement. The government covers none of the interest. You’re responsible for interest during every period: in school, in grace, in deferment, and in forbearance.1Federal Student Aid. Subsidized and Unsubsidized Loans
You aren’t required to make payments while enrolled or during the grace period, but interest doesn’t pause just because payments do. It accumulates quietly from the day funds hit your school’s account. By graduation, years of unpaid interest can be waiting.
Graduate and professional students can only borrow unsubsidized loans; subsidized loans aren’t available to them at all.2Federal Student Aid. 2025-2026 Federal Student Aid Handbook – Annual and Aggregate Loan Limits Graduate borrowers also pay a higher rate, which makes letting interest accrue more expensive.
The Rate and Fee You Actually Pay
Federal student loan rates are fixed for the life of each loan, and the rate you receive depends on when the loan is first disbursed. For loans first disbursed on or after July 1, 2025, and before July 1, 2026:
- 6.39% for Direct Subsidized and Direct Unsubsidized Loans to undergraduates
- 7.94% for Direct Unsubsidized Loans to graduate or professional students
Notice that for undergraduates, the subsidized and unsubsidized rate is identical. The savings from a subsidized loan don’t come from a lower rate; they come from the government paying your interest during the protected periods.
Every disbursement also carries an origination fee of 1.057% for both loan types, deducted before the money reaches your school.4Federal Student Aid. FY 26 Sequester-Required Changes to the Title IV Student Aid Programs On a $5,000 loan, about $53 is withheld, you receive roughly $4,947, and you owe interest on the full $5,000.
How Daily Interest Is Calculated
Federal student loans use a simple daily interest formula. Take your outstanding principal, multiply by your annual rate divided by 365, and the result is the interest that accrues each day.3Federal Student Aid. Interest Rates and Fees for Federal Student Loans
On a $10,000 unsubsidized loan at 6.39%, that’s $10,000 × (0.0639 ÷ 365), or about $1.75 per day. Roughly $52.50 a month. Across a four-year degree, before repayment even begins, that single $10,000 loan can accrue around $2,557 in interest.
When the Difference Hits Hardest
While You’re in School
Subsidized: the government pays. Balance flat. Unsubsidized: daily accrual on every dollar from disbursement.
During the Grace Period
After you graduate, drop below half-time, or leave school, a six-month grace period begins before payments are due. The subsidy continues on subsidized loans during this window.1Federal Student Aid. Subsidized and Unsubsidized Loans Unsubsidized loans keep accruing daily, and any interest you haven’t paid will be waiting to capitalize.
During Deferment
A deferment is an approved pause on payments, commonly for returning to school, economic hardship, or active military service. Subsidized loans accrue no interest during deferment because the government keeps paying it. Unsubsidized loans continue to accrue, and the balance is yours.5Federal Student Aid. Deferment and Forbearance
During Forbearance
Forbearance is where the subsidy ends. Interest accrues on all federal loan types during forbearance, including subsidized loans.5Federal Student Aid. Deferment and Forbearance If you qualify for either, deferment is almost always the better choice for a subsidized borrower.
Capitalization Turns Interest Into More Debt
Capitalization is the moment unpaid interest becomes a real, permanent cost increase. When interest capitalizes, it’s added to your principal balance, and from then on new interest accrues on that larger figure.6Consumer Financial Protection Bureau. How Does Interest Accrue While I Am in School? You end up paying interest on interest.
For unsubsidized loans, capitalization typically happens when the grace period ends or when a deferment concludes.7Nelnet. Interest Capitalization An example: you borrow $5,000 in unsubsidized loans at 10% for a 12-month program. By the time school and the grace period end, $750 in interest has accrued. That $750 is added to principal, your new balance is $5,750, and all future daily interest is calculated on that larger number.6Consumer Financial Protection Bureau. How Does Interest Accrue While I Am in School?
Subsidized borrowers are largely shielded from this during school, grace, and deferment, because no interest accrues then. Forbearance is the exception: interest built up on a subsidized loan during forbearance can capitalize when forbearance ends.
How To Hold Your Interest Costs Down
The single most effective move with an unsubsidized loan is to pay the interest as it accrues, instead of letting it capitalize. Even modest voluntary payments while you’re enrolled keep the balance from growing. On a $10,000 loan at 6.39%, roughly $53 a month is enough to stay even.
If a full interest payment isn’t realistic, pay what you can. Any payment reduces the amount that eventually capitalizes. If you need a temporary pause and have a choice between deferment and forbearance on a subsidized loan, choose deferment.1Federal Student Aid. Subsidized and Unsubsidized Loans
Active-duty servicemembers may qualify under the Servicemembers Civil Relief Act for a 6% interest cap on eligible federal student loans during qualifying military service.8Federal Student Aid. Servicemembers Civil Relief Act (SCRA) Interest Rate Limitation Request If your rate is already below 6% the cap does nothing, but at the 7.94% graduate rate it produces meaningful savings during deployment.
One Boundary on the Subsidy: The 150% Time Limit
If you first received a Direct Loan on or after July 1, 2013, there’s a cap on how long you can receive subsidized loans. The limit is 150% of your program’s published length, so six years for a standard four-year degree.9Federal Student Aid. 150 Percent Direct Subsidized Loan Limit Information Reach that limit and you lose the interest subsidy on all your outstanding subsidized loans; from then on they accrue interest like unsubsidized loans during future in-school and grace periods. Students who switch majors or transfer schools and take longer to finish are the ones most often surprised by it.