Interest accrues on most federal student loans while you are still in school, but you do not pay it until after you graduate
The timing of when interest starts depends on the type of loan. Subsidized federal loans do not accrue interest while you are enrolled at least half-time. Unsubsidized federal loans begin accruing interest the moment the money is disbursed to your school, even if you are still a student. Private student loans vary by lender, but most start accruing interest immediately as well.
The difference matters because unpaid interest on unsubsidized loans gets added to your principal balance after graduation — a process called capitalization. This means you end up paying interest on top of interest. Subsidized loans avoid this problem entirely because the government covers the interest while you study.
After you graduate, leave school, or drop below half-time enrollment, interest on all federal loans begins accruing if it has not already. You enter a grace period (usually six months for federal loans) during which you do not have to make payments, but interest still builds on unsubsidized loans. Once the grace period ends, your monthly payment includes both principal and accrued interest.
Key Takeaways
- Subsidized federal loans do not accrue interest while you are enrolled at least half-time; unsubsidized loans accrue interest from the day they are disbursed.
- Interest that builds on unsubsidized loans during school gets added to your principal balance after graduation, meaning you pay interest on a larger amount.
- After you graduate or drop below half-time status, interest accrues on all federal loans, including subsidized ones.
- A six-month grace period follows graduation on federal loans, but interest on unsubsidized loans continues to build during this time.
- Private student loans typically start accruing interest immediately, regardless of your enrollment status.
How subsidized loans protect you from accruing interest
The federal government pays the interest on subsidized loans while you are in school. This is the main reason subsidized loans are harder to get — they cost the government money. To receive a subsidized loan, you must demonstrate financial need, and the amount you can borrow is capped lower than unsubsidized loans.
Subsidized loans stop being subsidized once you graduate or fall below half-time enrollment. At that point, interest begins accruing on them just like any other loan. However, you still have the grace period before payments start, and no interest capitalizes during that time — it simply waits to be paid.
If you return to school at half-time or more after graduation, your subsidized loans do not revert to subsidized status. Interest continues to accrue, even though you are a student again.
What happens with unsubsidized loans while you are in school
Unsubsidized loans accrue interest from the moment your school receives the funds. You are not required to pay this interest while you are studying, but it is building. Many students ignore this interest and let it sit unpaid until after graduation.
When you graduate or stop being a half-time student, any unpaid interest gets capitalized — added to your loan balance. If you borrowed $10,000 in unsubsidized loans and $2,000 in interest accrued while you were in school, your new principal becomes $12,000. You now owe interest on that $12,000, not just the original $10,000.
Some borrowers pay the accrued interest while still in school to avoid capitalization. This is optional but can save money over the life of the loan. You can make these payments through your loan servicer.
Private student loans and when they start charging interest
Private loans are issued by banks, credit unions, and other lenders, not the federal government. Most private loans begin accruing interest immediately after disbursement, regardless of whether you are still in school. The terms vary by lender and by the specific loan product.
Some private lenders offer in-school deferment, which means you do not have to make payments while enrolled, but interest still accrues. Others require you to make interest-only payments during school. A few offer loans where interest does not accrue until after graduation, but these are less common and usually come with higher interest rates.
Check your loan documents or contact your lender directly to learn when interest starts on your private loans. The terms are set when you borrow and do not change based on your enrollment status.
The grace period and what happens after it ends
Federal student loans include a grace period — typically six months — after you graduate, leave school, or drop below half-time enrollment. During this time, you do not have to make payments. However, interest on unsubsidized loans continues to accrue.
When the grace period ends, your first payment is due. This payment covers both principal and any interest that has built up. If you have multiple loans, each one may have its own grace period start date based on when you left school or graduated.
Private loans may or may not include a grace period. Some start requiring payments immediately after disbursement; others offer a grace period similar to federal loans. Check your promissory note or contact your lender to confirm.
Interest rates and how they affect what you owe
Federal student loan interest rates are set by Congress and are the same for all borrowers in a given year. For the 2024–2025 academic year, the rates are fixed and do not change over the life of the loan. Rates vary by loan type: undergraduate loans, graduate loans, and PLUS loans each have different rates.
Private loan interest rates depend on the lender and your creditworthiness. They can be fixed or variable. A variable rate may start low but can increase over time, making your monthly payment higher in later years.
The interest rate is applied to your principal balance. The higher the rate and the longer interest accrues before you start paying, the more you owe in total. This is why understanding when interest starts matters — it directly affects the final cost of your loan.
What to do if you want to reduce accrued interest before graduation
If you have unsubsidized loans and want to minimize capitalization, you can pay the accrued interest before you graduate. Contact your loan servicer to find out how much interest has built up and how to make a payment. You can pay in full or make partial payments.
Paying interest while in school is not required, but it reduces the amount that gets capitalized. If you have the money available, it can save you thousands in interest charges over the repayment period. However, if paying interest would strain your finances, it is better to focus on completing your degree.
Some employers offer student loan repayment assistance. If your employer has this benefit, they may help you pay down interest or principal while you are still working there. Check with your human resources department.
Frequently Asked Questions
Does interest accrue on federal loans during a deferment or forbearance?
Interest accrues on all federal loans during forbearance. During deferment, interest accrues on unsubsidized loans but not on subsidized loans. If you use forbearance or deferment after graduation, any unpaid interest on unsubsidized loans will capitalize when the period ends.
What if I took out loans over multiple years?
Each loan disbursement starts accruing interest on its own schedule. A loan disbursed in your first year begins accruing before a loan disbursed in your fourth year. When you graduate, each loan enters its own grace period based on when it was disbursed, though many servicers align them for convenience.
Can I pay off accrued interest before it capitalizes?
Yes. You can contact your loan servicer at any time and pay accrued interest on unsubsidized loans. Paying before capitalization prevents that interest from being added to your principal. There is no penalty for paying early or paying more than the minimum.
Do Parent PLUS loans accrue interest while the student is in school?
Yes. Parent PLUS loans begin accruing interest immediately after disbursement, even while the student is enrolled. Parents can choose to pay interest while the student is in school or let it accrue and capitalize after the student graduates.
What happens to interest if I go back to school after graduating?
Interest continues to accrue on all loans, including subsidized ones, if you return to school after graduation. Subsidized loans are only subsidized during your initial enrollment. If you pursue additional education later, you would need to take out new loans to receive subsidized status.