Interest on a federal student loan stops accruing when one of four things happens: you pay the principal down to zero, you enter a period where the government covers the interest for you, the loan is forgiven, or the loan is discharged. Knowing when interest stops accruing on student loans comes down to identifying which of those triggers applies to your loan type and your situation, because each has its own rules. Private loans follow their contracts and offer far fewer of these off-ramps.
Paying the Balance to Zero
Federal student loans use a simple daily interest formula: your servicer multiplies the current principal by your interest rate and divides by 365.25 to get each day’s charge.1Federal Student Aid. FAQs – Interest and Fees Zero principal produces zero interest. The moment the balance hits zero, accrual stops.
One practical trap: the balance printed on your monthly statement is already outdated by the time you see it. Interest kept accruing between the statement date and today, so paying exactly the statement figure usually leaves a small residual that keeps growing. Request a payoff quote instead. Quotes sent by mail typically build in about 10 extra days of estimated interest to cover delivery, and the servicer refunds the difference if your payment arrives sooner.2Edfinancial Services. Loan Payoff Information Paying electronically shrinks that window.
Periods When the Government Covers the Interest
Direct Subsidized Loans carry a benefit no other federal loan type has. During qualifying deferment periods and during the six-month grace period after you leave school or drop below half-time enrollment, the government pays the interest so the balance does not grow.3eCFR. 34 CFR 685.204 – Deferment The subsidized portion of a Direct Consolidation Loan is treated the same way.
Qualifying deferments include enrollment at least half-time at an eligible school, a graduate fellowship, documented unemployment while actively seeking work, and rehabilitation training for a disability.3eCFR. 34 CFR 685.204 – Deferment In any of these periods, a subsidized borrower owes nothing and the balance stays flat.
Direct Unsubsidized Loans do not get this treatment. Interest keeps accruing during deferment and during the grace period, and any unpaid interest can capitalize onto your principal, so you end up paying interest on a larger balance. There is one narrow exception: a cancer treatment deferment waives interest on both Direct Unsubsidized Loans and Direct Unsubsidized Consolidation Loans for as long as the borrower is undergoing active cancer treatment.4Federal Student Aid. Cancer Treatment Deferment Request
Deferment Is Not Forbearance
This distinction catches a lot of borrowers. In forbearance, interest accrues on every federal loan type, including subsidized ones.5Federal Student Aid. What Is the Difference Between Loan Deferment and Loan Forbearance If your servicer places you in administrative forbearance while it processes a plan change or resolves an error, interest is running the whole time. Only deferment on a subsidized loan actually freezes accrual, so it is worth confirming which status you are in.
Income-Driven Repayment Interest Subsidies
Income-driven repayment plans set monthly payments based on income rather than balance. When your payment does not cover the full amount of monthly interest, some plans have the government absorb part of that shortfall so the balance does not balloon.
Under Income-Based Repayment, the government covers 100% of the unpaid interest on subsidized loans for the first three consecutive years of repayment.6MOHELA. Income-Driven Repayment (IDR) Plans After that window closes, any monthly interest your payment does not cover is added to your balance. The three-year clock does not reset when you switch between IDR plans.
The SAVE plan previously offered a broader interest write-off, covering the remaining interest on both subsidized and unsubsidized loans after each on-time payment. A federal court struck SAVE down and it is no longer available. If you were enrolled, you have been moved to another plan, and the subsidy available to you now depends on which plan and which loans you hold. Your servicer can confirm the specifics.
Forgiveness Ends the Debt and the Interest With It
When a loan is forgiven, the remaining principal and every dollar of accrued interest disappear together. Two federal pathways lead here for most borrowers.
Public Service Loan Forgiveness
After 120 qualifying monthly payments made while working full-time for a government employer or qualifying nonprofit, the remaining Direct Loan balance is discharged. Outstanding interest is wiped along with the principal, and PSLF forgiveness is not treated as taxable income.7Office of the Law Revision Counsel. 26 USC 108 – Income From Discharge of Indebtedness
IDR Forgiveness After 20 or 25 Years
Borrowers on income-driven plans who still carry a balance after 20 years (undergraduate loans) or 25 years (graduate loans) receive forgiveness of what remains. Interest stops at that point. Unlike PSLF, this forgiveness is taxable. The American Rescue Plan temporarily excluded all student loan forgiveness from federal income tax through December 31, 2025, but that provision has expired. Starting in 2026, a forgiven IDR balance counts as ordinary income on your federal return, and a borrower with tens of thousands forgiven could face a five-figure tax bill.
Military Service Protections
Active-duty service members get two distinct interest benefits.
The 6% SCRA Cap
The Servicemembers Civil Relief Act caps interest at 6% per year on any student loan, federal or private, taken out before entering active duty.8Office of the Law Revision Counsel. 50 USC 3937 – Maximum Rate of Interest on Debts Incurred Before Military Service Interest above the cap is permanently forgiven, not deferred, for the entire period of service. Federal servicers have applied this automatically since 2012, checking Department of Defense databases without the borrower needing to ask.9Consumer Financial Protection Bureau. Tackling Student Loan Debt for Servicemembers Private lenders do not; you have to send them a copy of your military orders.
Zero Percent During Hostile Fire Service
A separate benefit drops the rate to 0% on Direct Loans first disbursed on or after October 1, 2008, while the borrower serves in an area that qualifies for hostile fire or imminent danger pay. The benefit lasts up to 60 months, and no interest accrues during that time.10Federal Student Aid. Zero Percent Student Loan Interest for Eligible Service Members Service members need to send deployment documentation to their servicer to trigger it.
Total and Permanent Disability Discharge
Federal borrowers who are permanently and totally disabled can have their loans discharged, which ends all interest.11Office of the Law Revision Counsel. 20 USC 1087 – Repayment by Secretary of Loans of Bankrupt, Deceased, or Disabled Borrowersa> Qualifying conditions include a physical or mental impairment that prevents substantial work and is expected to last at least 60 months or result in death.
The Department of Education now identifies most eligible borrowers automatically through data matches with the Social Security Administration and the Department of Veterans Affairs. Those borrowers get a notice explaining that discharge will happen within 60 days unless they opt out.12Federal Student Aid. Automatic Total and Permanent Disability Discharge Through Social Security Administration Data Match As of July 1, 2023, the three-year income-monitoring period that used to follow discharge was eliminated for most borrowers.
Death of the Borrower
Federal student loan interest stops permanently when the borrower dies. The Secretary of Education is required to discharge the full balance, and the obligation does not pass to the estate or surviving family.13Office of the Law Revision Counsel. 20 USC 1087 – Repayment by Secretary of Loans of Bankrupt, Deceased, or Disabled Borrowers Interest that accrued between the date of death and the processing of the discharge is voided retroactively. The same protection applies to Parent PLUS Loans when the student on whose behalf the parent borrowed dies.14Federal Student Aid. Required Actions When a Student Dies
To trigger the discharge, the servicer needs an original or certified copy of the death certificate, or a clear photocopy, scan, or fax of the certified certificate. The Department of Education can also verify a death through approved federal or state electronic databases.14Federal Student Aid. Required Actions When a Student Dies Without documentation, the servicer will eventually resume billing, so getting the paperwork in promptly matters.
Private Student Loans Follow Different Rules
Every trigger above applies to federal loans. Private student loans follow the terms in the lending contract, and the protections are much thinner. Private lenders are not required to offer deferment, income-driven plans, or forgiveness, and the only guaranteed way to stop interest on a private loan is to pay the balance to zero. The SCRA’s 6% cap does reach private loans taken out before active duty, but the borrower has to request it and provide orders. Private lenders may offer forbearance or hardship programs, and interest almost always keeps running during those periods. There is no federal death discharge requirement for private loans, though many lenders have adopted voluntary policies.