Your payment depends on your loan type, interest rate, and repayment plan
The amount you pay each month on federal student loans is determined by three things: how much you borrowed, what interest rate is attached to your loan, and which repayment plan you choose. For federal loans, you do not have a single fixed payment — you can switch plans, and some plans tie your payment to your income rather than to a set dollar amount. Private loans work differently: your lender sets the payment based on the loan amount, interest rate, and term length you agreed to, and changing it usually requires refinancing.
The fastest way to see your actual payment is to log into your loan servicer's website (for federal loans, that is typically Fedloan Servicing, Nelnet, Great Lakes, or Mohela) or your private lender's portal. They show your current plan and monthly payment. If you want to understand how the number was calculated, or if you are considering switching plans, the math behind it matters.
Key Takeaways
- Federal loan payments vary by plan: standard repayment is a fixed amount over ten years, while income-driven plans calculate payment as a percentage of your discretionary income.
- Your loan servicer's website shows your current payment and plan; you can model different plans there before switching.
- Private loan payments are set by your lender and do not change unless you refinance, but you can use an online calculator to estimate what a new loan would cost.
- The same loan amount produces different monthly payments depending on the plan — income-driven plans often start lower but extend the repayment period.
- Interest accrues daily on unsubsidized loans, so the longer your repayment period, the more total interest you will pay.
How federal standard repayment calculates your payment
The standard repayment plan for federal loans uses a fixed payment over ten years. The payment is calculated so that you pay off the principal plus all accrued interest in equal monthly installments. The formula depends on your loan balance and interest rate, but you do not need to do the math yourself — your servicer calculates it and tells you the amount.
For example, if you borrowed $30,000 at 5% interest on a standard ten-year plan, your monthly payment would be roughly $283. If you borrowed $60,000 at the same rate and plan, it would be roughly $566. The payment is higher because the principal is higher, and because interest accrues on a larger balance each month.
Standard repayment is the default plan for most borrowers. If you do nothing after your loans enter repayment, this is what you will pay. The advantage is that you pay off the loan faster and pay less total interest. The disadvantage is that the monthly payment is often the highest of all available plans.
Income-driven plans and how they set your payment
Federal income-driven repayment plans calculate your payment as a percentage of your discretionary income — roughly your gross income minus 150% of the federal poverty line for your family size. There are four income-driven plans: PAYE (Pay As You Earn), REPAYE (Revised Pay As You Earn), IBR (Income-Based Repayment), and ICR (Income-Contingent Repayment). Each uses a slightly different percentage and has different rules about what happens after 20 or 25 years.
On PAYE, for example, your payment is 10% of your discretionary income. If your gross income is $50,000 and the poverty line calculation leaves you with $35,000 in discretionary income, your payment would be $350 per month — much lower than the standard plan payment on the same loan. The trade-off is that your loan takes longer to repay, and you accrue more interest over time.
Income-driven plans require you to submit proof of income each year (usually your tax return). If your income changes, your payment changes. If your income drops to zero, your payment can be zero, though interest still accrues on unsubsidized loans. You can switch between plans at any time by contacting your servicer or using the Federal Student Aid website.
What happens to interest on different repayment timelines
Interest on federal loans accrues daily. The longer your repayment period, the more interest you pay in total, even if your monthly payment is lower. This is the hidden cost of income-driven plans: while your payment may be $200 per month instead of $400, you might pay $40,000 in interest instead of $20,000 over the life of the loan.
On subsidized loans (usually undergraduate federal loans), the government pays the interest while you are in school and during certain deferment periods. On unsubsidized loans (graduate loans and some undergraduate loans), interest accrues from the moment the loan is disbursed. If you do not pay the accrued interest, it capitalizes — gets added to your principal — and you then pay interest on the interest.
Your loan servicer's website usually shows an amortization schedule or a loan summary that breaks down how much of each payment goes to principal versus interest. Looking at this for different plans can help you see the true cost of choosing a longer repayment period.
Private loan payments and refinancing
Private student loans have a fixed payment set by your lender based on the loan amount, interest rate, and term (usually 5 to 20 years). You agree to these terms when you sign the promissory note, and the payment does not change unless you refinance — take out a new loan to pay off the old one.
If you refinance, you get a new interest rate based on your current credit score and income. A better credit score or higher income can lower your rate, which lowers your payment. A worse credit score or lower income can raise your rate. Refinancing also resets the clock on your repayment period, so you might extend the loan another 10 years even if you had only 5 years left.
To estimate what a private loan payment would be, use an online student loan calculator and enter the loan amount, interest rate, and term length. Most lenders also offer a rate quote tool on their website that shows you what rate you might receive without a hard credit pull.
How to model different payment scenarios
Your federal loan servicer's website has a repayment estimator tool that lets you see what your payment would be under each plan without actually switching. Log in, find the repayment plan section, and select different plans to see the monthly payment, total interest paid, and payoff date for each one.
For private loans, use the lender's calculator or a third-party tool like the Student Loan Planner or Bankrate's student loan calculator. Enter your loan balance, interest rate, and desired term length. The calculator shows you the monthly payment and total interest you would pay over the life of the loan.
When comparing plans, look at three numbers: the monthly payment, the total interest paid, and the payoff date. A lower monthly payment often means higher total interest and a longer payoff period. Decide which matters most to your situation — if you need breathing room now, an income-driven plan might be worth the extra interest. If you can afford a higher payment, standard repayment saves you money in the long run.
When your payment changes or stays the same
On federal standard repayment, your payment stays the same every month for ten years (unless you switch plans). On income-driven plans, your payment recalculates each year when you recertify your income. If your income goes up, your payment goes up. If your income goes down, your payment goes down.
On private loans, your payment is fixed for the life of the loan unless you refinance. Some private lenders offer variable-rate loans where the interest rate (and therefore the payment) can change, but most borrowers choose fixed-rate loans to avoid surprises.
If you experience a major life change — job loss, income drop, family emergency — contact your servicer immediately. Federal loans have forbearance and deferment options that pause or reduce your payment temporarily. Private loans may have hardship programs, though they vary by lender.
Frequently Asked Questions
Can I see my payment before I start repaying?
Yes. Before your loans enter repayment (usually six months after graduation), you can log into your servicer's website and use the repayment estimator to see what you would pay under each plan. This is a good time to decide which plan fits your budget, because you can switch to it before payments begin.
What if my payment is so low under an income-driven plan that it does not cover the interest?
The unpaid interest capitalizes — it gets added to your loan balance. This means your loan grows even though you are making payments. This happens most often on REPAYE with unsubsidized loans. You can avoid it by paying at least the interest amount each month, or by switching to a plan with a higher payment.
Do I have to pay the same amount every month?
On standard repayment, yes. On income-driven plans, no — your payment recalculates each year based on your income. On private loans, yes, unless you refinance. If you want flexibility, an income-driven plan gives it to you, but at the cost of more total interest.
What if I want to pay more than my monthly payment?
You can pay extra at any time on both federal and private loans. Ask your servicer or lender how to apply the extra payment to principal (not to future payments). Paying extra reduces the total interest you pay and shortens your repayment period.
How do I know which plan will cost me the least?
Use your servicer's repayment estimator and compare the total interest paid under each plan. Standard repayment usually costs the least in total interest, but it has the highest monthly payment. An income-driven plan costs more in total interest but has a lower starting payment. Choose based on what you can afford now and what you want to pay in total over time.