How Are Student Loan Payments Calculated?

By Corey Buhay | Published on October 21, 2025

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Taking out student loans can quickly start to feel confusing. That’s especially true when it comes to the repayment process. Student loan lenders offer a wide variety of interest rates, loan terms, and repayment schedules — which can mean almost endless variation in the exact amount of your monthly bill. The trick to predicting your future monthly payment is understanding exactly how all these variables interact.

So, how are student loan payments calculated? And how can you determine exactly what you’ll owe when you start making payments? Here’s how it all works.

How do student loans work?

Student loans are one of the most common methods of paying for college. In fact, according to research from the Education Data Initiative, more than 70% of students took out student loans or other financial aid to help cover their cost of attendance in 2023.

But just because they’re common doesn’t mean student loans are always straightforward. Here’s a little insight into how the student loan process works:

1. Find a lender. Before your semester starts, you’ll reach out to a lender. For federal student loans, the lender is the federal government. For private student loans, that’s a private lender, like a bank, credit union, or online lender.

2. Apply for the loan. You’ll then fill out a loan application, sharing your desired loan balance and some personal details. If it’s a federal application, you won’t need to provide your credit score. If it’s a private student loan application, though, you’ll need to share some financial information so the lender can assess your eligibility.

3. Receive the funds. When the loan is approved, your college will receive the loan funds in a single lump sum, typically before the start of your next semester. After tuition and fees are paid, any remaining funds will be sent to your bank account.

4. Make only interest payments. While you’re enrolled in school, you’re in a period of deferment. That means you’re not responsible for making monthly student loan payments quite yet. For some types of loans — including private loans, federal unsubsidized loans, and Parent PLUS loans — interest will still accrue during this period. For federal subsidized loans, however, no interest will accrue.

5. Finish out the grace period. Once you graduate, you’ll typically be granted a six- to nine-month grace period. During this time, your loans remain in deferment. If your loans are accruing interest, it may be smart to pay that interest to keep it from building up. But if they’re subsidized loans, you won’t have to pay anything at all.

6. Start making payments. When your grace period ends, you’ll start receiving a student loan bill each month. Your exact monthly payment amount will depend on a number of factors.

Factors that affect student loan payments

When you take out a loan, the total balance you then owe isn’t just the loan amount. Instead, it includes the actual loan balance as well as any accrued interest, lender fees, and other costs. Typically, you repay this amount slowly over time via a series of monthly installments. Each installment is a small percentage of your total bill. The way that the installments are split up — and the kinds of fees and interest that make them up — all influence your monthly payment amount. Here are some factors to consider.

The loan amount

Generally, the higher the loan amount, the higher your monthly payment will be. For example, if you take out $12,000 and plan to repay that loan over 10 years, or 120 months, you’ll have to pay $100 toward the principal each month to get out of debt on time. But if you take out just $60,000, you’ll only have to pay $500 per month over those 10 years.

The loan term

The loan term is the amount of time you have to repay the loan. The longer the loan repayment term, the lower your monthly payment will be. That’s because the total cost is spread out over more individual payments. However, making more payments means you’ll be paying interest for a longer period of time. For that reason, loans with longer repayment periods may have lower monthly payment amounts, but they tend to cost borrowers more over time.

Your interest rate

The interest rate you receive when you originate your loans will make a big impact on how much they ultimately cost. If you have a higher interest rate, you’ll have a higher monthly payment amount. You’ll also pay more over the life of the loan. The only way to get a lower interest rate on your student loans is to refinance them with a private lender. You’ll qualify for lenders’ lowest rates if you have an excellent credit score or if you can find a creditworthy cosigner to vouch for you.

The type of interest rate

There are two types of student loan interest rates: fixed rates and variable rates. With a fixed rate, your monthly payment amount will remain stable over the life of the loan because your interest rate will never change (unless you choose to refinance). All federal loans come with fixed interest rates. With a variable interest rate, on the other hand, your rate will go up and down according to national market trends. That means your monthly payment amount could change many times over the life of the loan.

Interest capitalization

If you have private loans, federal unsubsidized loans, or Parent PLUS loans, they’ll accrue interest while you’re in school and during your post-graduation grace period. If you don’t pay this interest before the end of the grace period, the total interest due will “capitalize,” or get added to your principal balance. That means that after you graduate, you’ll have to pay interest on this interest as well as on your actual student loan balance. This will make your monthly payment more expensive.

Fees

Rather than requiring you to pay fees upfront, lenders tend to roll these costs into your total loan amount. So, the more fees your lender charges, the higher your monthly payment will be.

How are federal student loan payments calculated?

When you apply for federal student aid, you’ll be offered a standardized, fixed interest rate. These rates are the same for all borrowers, regardless of credit score or financial standing. They’re published each year, during the summer before fall semester starts.

With federal student loans, your monthly payment amount will be calculated based on the default, standard repayment plan, which is 10 years. However, you can consolidate your loans later if you prefer an extended repayment term.

How are private student loan payments calculated?

When you take out a private student loan, the lender will base your monthly payment amount on your chosen repayment period, the total amount of your loan, and your credit score. Usually, you can qualify for lower interest rates if you choose a shorter loan term. This will make your monthly payment higher, but you’ll pay less money in total over the life of the loan.

What to do if your student loan payments are too high

If you’re struggling to make your student loan payments, there are a few things you can do to reduce your monthly payment amount and get back on track.

Consolidate your student loans

Student loan consolidation is a program offered through the U.S. Department of Education. It’s only available for federal student loans. With consolidation, you can combine all your federal student loan debt into a new Direct Loan, which has a single, easy-to-manage monthly bill. Because you’re getting a new loan, you have the opportunity to choose a longer repayment term. This can reduce your monthly bill. However, you can’t get a lower interest rate via student loan consolidation. Instead, your new interest rate will simply be a weighted average of the interest rates on your current loans.

Refinance your student loans

Like student loan consolidation, student loan refinancing allows you to combine multiple loans into a single loan with a single new monthly payment. The difference is that you can use refinancing to combine federal loans, private loans, or some combination of both. You can also refinance to get a lower interest rate, provided that you have a good credit score and strong financial footing. The only catch is that if you refinance federal loans, they become private loans and cannot be switched back. So, once you refinance your federal student aid, you’ll lose access to government benefits. These include generous federal deferment, forbearance, and loan forgiveness programs.

Apply for income-driven repayment

If you have federal student loans, consider applying for an income-driven repayment plan (IDR). Under this kind of plan, your monthly payment amount will be capped based on your discretionary income and family size. There are four different types of IDR plans available, each catering to different types of borrowers.

• Saving on a Valuable Education Plan (SAVE), formerly known as the REPAYE Plan
• Pay As You Earn Plan (PAYE)
• Income-Based Repayment Plan (IBR)
• Income-Contingent Repayment Plan (ICR)

Look into student loan forgiveness

Some federal student loan borrowers may also be eligible for loan cancellation or forgiveness programs. If you’re working in the military, for the government, or in the public sector, you might qualify for programs like Teacher Loan Forgiveness or Public Service Loan Forgiveness (PSLF). It’s also worth seeing if you qualify for the Biden Administration’s recent student loan relief plan.

Reach out to your loan servicer

If you’re having trouble making your student loan payments, ask your loan servicer if they have any hardship protections in place. The federal government has a number of programs to help struggling borrowers, and many private lenders — including Earnest — also offer deferment and emergency discharge options.

Find out how much you could save with Earnest

Whether you’re a first-time borrower or simply looking to reduce the monthly payment on your existing student loans, Earnest can help. We offer fast access to funding at competitive interest rates, as well as a seamless refinancing process. With Earnest loans, you can repay your balance on your terms, skip a payment once per year without penalty, and take advantage of special discounts and low interest rates. Learn more by checking your rate online (It’s totally free, and it won’t impact your credit score). Visit us today to see how much you could save.

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About the Author

Corey Buhay

Corey Buhay is a writer and editor based in Boulder, Colorado. She’s passionate about literature, the outdoors, and doing her taxes by hand. She has been writing about student loans and personal finance for Earnest since 2019. You’ll find her work in Outside Magazine, Backpacker Magazine, Smithsonian, and The Denver Post.