Federal student loans you receive through the FAFSA start accruing interest at different times depending on which loan you took. Direct Subsidized Loans don’t accrue interest while you’re enrolled at least half-time, during your six-month grace period, or during an eligible deferment — the federal government pays it for you. Direct Unsubsidized Loans and Direct PLUS Loans start accruing interest the day your school receives the money, and that interest keeps building through school, the grace period, deferment, and forbearance alike. That single difference can add thousands of dollars to your balance before your first payment is ever due.
Direct Subsidized Loans: Interest Starts at Repayment
Direct Subsidized Loans are reserved for undergraduates who demonstrate financial need on the FAFSA. The government covers the interest during three windows: while you’re enrolled at least half-time, during your six-month grace period after you leave school, and during eligible deferments.1eCFR. 34 CFR 685.204 – Deferment Through all of that, your principal balance stays exactly where it started.
You start owing interest once the grace period ends and repayment begins. From then on, daily interest builds on your outstanding balance and your monthly payment covers it. One exception matters: if you enter forbearance rather than deferment, you lose the subsidy for that stretch and interest starts accruing on your subsidized loans too.2Federal Student Aid. Get Temporary Relief – Deferment and Forbearance
Subsidized borrowing is capped. Undergraduates can take out no more than $23,000 in subsidized loans across their entire education. Independent undergraduates can borrow up to $57,500 in Direct Loans total, and dependent students up to $31,000, but only $23,000 of either total can be subsidized.3Federal Student Aid. Direct Subsidized and Direct Unsubsidized Loans Anything above those subsidized limits becomes unsubsidized, which is a very different loan when it comes to interest.
Direct Unsubsidized Loans: Interest Starts at Disbursement
Direct Unsubsidized Loans accrue interest immediately when the funds are disbursed to your school. There’s no waiting period, no enrollment-based protection, and no government subsidy at any point. Undergraduates and graduate students both qualify, and financial need doesn’t factor into eligibility.3Federal Student Aid. Direct Subsidized and Direct Unsubsidized Loans
Interest keeps building through every phase: while you’re in school, during the grace period, during deferment, and during forbearance. If you don’t pay that interest as it accrues, it accumulates until it’s eventually added to your principal balance through capitalization. A four-year undergraduate carrying $20,000 in unsubsidized loans at 6.39% will build up roughly $5,100 in interest before making a single payment, assuming no in-school payments.
Direct PLUS Loans: Interest Starts at Disbursement
Direct PLUS Loans follow the same timeline as unsubsidized loans. Interest accrues from disbursement and never stops, regardless of enrollment status or payment activity. The Department of Education states plainly that interest is “charged during all periods” on PLUS Loans.4Federal Student Aid. Direct PLUS Loan Basics for Parents
PLUS Loans are available to parents of dependent undergraduates and to graduate or professional students. Unlike other federal loans, they require a credit check. Borrowers with accounts totaling $2,085 or more that are 90 or more days delinquent, or with a recent bankruptcy or foreclosure, will be denied unless they appeal or obtain an endorser.5Federal Student Aid. PLUS Loans – What to Do if Youre Denied Based on Adverse Credit History
Parent PLUS borrowers technically enter repayment as soon as the loan is fully disbursed, though they can defer payments while their child is enrolled at least half-time and for six months after. Interest accrues throughout that deferral. At 8.94% and with no cap on borrowing beyond the cost of attendance, PLUS interest can grow faster than most borrowers expect. A parent who borrows $40,000 over four years at 8.94% without making in-school payments will owe several thousand dollars in interest before the first bill arrives.
How Daily Interest Adds Up
Federal student loans use a simple daily interest formula. Each day, your servicer divides your annual rate by 365 and multiplies that by your outstanding principal.6Federal Student Aid. Federal Interest Rates and Fees That’s your accrual for the day.
On a $10,000 unsubsidized loan at 6.39%, that’s about $1.75 a day. Over a four-year degree, roughly $2,555 in interest builds up before you’ve made a payment. If you can manage even small interest payments while enrolled, every dollar you put toward interest during school is a dollar that won’t get folded into your principal later.
What Happens During the Grace Period
The grace period is a six-month window after you graduate, leave school, or drop below half-time enrollment. No payments are due on Direct Loans during that time.7Federal Student Aid. How Long Is My Grace Period What happens to interest depends on your loan:
- On Direct Subsidized Loans, the government continues covering the interest. Your balance stays flat.
- On Direct Unsubsidized Loans, interest accrues daily. Any unpaid interest may be capitalized when repayment begins, meaning you’ll then owe interest on a larger balance.1eCFR. 34 CFR 685.204 – Deferment
- On Direct PLUS Loans, interest accrues continuously. Parent borrowers who deferred payments while their child was in school face the same capitalization risk when active repayment starts.4Federal Student Aid. Direct PLUS Loan Basics for Parents
Paying even a portion of the interest during the grace period can significantly reduce what you owe long term. If you start a job before the six months are up, interest-only payments for a few months cost relatively little and keep capitalization from inflating your balance.
Deferment vs. Forbearance
Both pause your payments, but they treat interest very differently.
During deferment, the government keeps paying interest on subsidized loans. Unsubsidized and PLUS Loans keep accruing interest, and you can either pay it as it builds or let it accumulate to be capitalized when the deferment ends.1eCFR. 34 CFR 685.204 – Deferment
Forbearance is more expensive. Interest accrues on every loan type, including subsidized loans, because the subsidy doesn’t apply.2Federal Student Aid. Get Temporary Relief – Deferment and Forbearance Servicers can grant forbearance for up to 12 months at a time.8Consumer Financial Protection Bureau. What Is Student Loan Forbearance The Department of Education estimates that a borrower with $30,000 in loans at 6% who enters forbearance for one year adds roughly $1,800 in interest to the balance. If you qualify for deferment and hold subsidized loans, deferment is almost always the better choice.
When Unpaid Interest Gets Added to Your Balance
Capitalization is when your servicer takes the unpaid interest that’s been accumulating and adds it to your principal. After that, you pay interest on a larger number. This is where costs can accelerate beyond what many borrowers expect.
The Department of Education has limited when capitalization can happen on Direct Loans. Under current rules, it occurs in only a few situations: when a deferment ends on an unsubsidized loan, and on certain income-driven repayment events such as voluntarily switching plans, missing the annual income recertification deadline, or no longer qualifying for a reduced payment after recertification.9Nelnet Federal Student Aid. Interest Capitalization For Direct Loans, interest generally will not be added to principal at the end of a forbearance period.8Consumer Financial Protection Bureau. What Is Student Loan Forbearance
Even with those limits, capitalization still matters. If $3,000 in interest capitalizes onto a $20,000 loan, your new principal is $23,000 and every future interest calculation runs on that higher figure. Over a 10-year repayment, a single capitalization event can cost hundreds of dollars extra. Making interest payments during school or deferment, even partial ones, is the most direct way to prevent it.
Income-Driven Repayment and Interest Subsidies
Income-driven repayment (IDR) plans set your monthly payment based on your earnings, which sometimes means the payment doesn’t fully cover the interest that accrues each month. Some plans have offered a subsidy to keep your balance from growing in that situation, but recent court actions have narrowed what’s available.
The SAVE Plan (Saving on a Valuable Education) previously offered the most generous protection, covering 100% of remaining monthly interest on subsidized and unsubsidized loans after a borrower made the calculated payment. Courts blocked implementation of SAVE, and a proposed settlement in December 2025 would end the plan entirely. Borrowers who had enrolled were placed in a general forbearance during which interest accrues and no payments are required, though time in that forbearance doesn’t count toward Public Service Loan Forgiveness or IDR forgiveness.10Federal Student Aid. IDR Plan Court Actions – Impact on Borrowers
As of mid-2026, the only IDR plan with a functioning interest subsidy is Income-Based Repayment (IBR), and that subsidy is limited to subsidized loans during the first three years of payments.10Federal Student Aid. IDR Plan Court Actions – Impact on Borrowers If your IDR payment doesn’t cover all your monthly interest, the uncovered portion on unsubsidized and PLUS loans keeps accumulating with no government help.
Current Rates and Origination Fees
Federal student loan interest rates reset every July 1 and stay fixed for the life of each loan.11Office of the Law Revision Counsel. 20 USC 1087e – Terms and Conditions of Loans For loans first disbursed between July 1, 2025 and June 30, 2026, the rates are 6.39% on undergraduate Subsidized and Unsubsidized Loans, 7.94% on graduate and professional Unsubsidized Loans, and 8.94% on PLUS Loans for parents and graduate students.12Federal Student Aid Partners. Interest Rates for Direct Loans First Disbursed Between July 1, 2025 and June 30, 2026 A loan taken out in a prior year keeps its original rate, so borrowers with loans from multiple years often carry several rates at once.
Each disbursement also triggers an origination fee that’s deducted before the money reaches your school. For the federal fiscal year starting October 1, 2025, that’s 1.057% on Subsidized and Unsubsidized Loans and 4.228% on PLUS Loans.13Federal Student Aid Partners. FY 26 Sequester-Required Changes to the Title IV Student Aid Programs Borrow $10,000 in PLUS Loans and only about $9,577 reaches tuition, but interest accrues on the full $10,000 from the day of disbursement.
The single biggest variable in what you’ll ultimately pay is how long you let interest accumulate without paying. Every month of in-school accrual on unsubsidized and PLUS loans adds to the total. Even small voluntary payments during school or a grace period can meaningfully reduce what you owe over the life of the loan.