The main ways to reduce your total loan cost

Your total loan cost is the sum of every payment you make over the life of the loan — principal plus interest. The amount you borrow through FAFSA determines your starting principal, but you control several factors that shrink the total: how fast you repay, which repayment plan you choose, whether you make extra payments, and whether you pursue forgiveness programs tied to your job or income.

The federal loans you receive through FAFSA come with fixed interest rates set by Congress, so you cannot negotiate the rate itself. What you can do is change how much interest accumulates before you finish paying. A loan that costs $20,000 to borrow might cost $28,000 total if you stretch repayment over 25 years, or $22,000 if you finish in 10 years — the difference is pure interest that you avoid by paying faster.

Some borrowers also reduce their total cost by moving into income-driven repayment plans, which can lower monthly payments enough to let you pay more principal each month, or by working toward Public Service Loan Forgiveness, which erases remaining balance after 120 may have access to payments.

Key Takeaways

  • Paying your loans back faster — even by a few years — reduces total interest paid, because interest stops accumulating once the loan is gone.
  • Income-driven repayment plans can lower your monthly payment, which may let you pay more toward principal each month and finish sooner.
  • Extra payments toward principal (not interest) directly reduce what you owe and cut years off repayment if you make them consistently.
  • Public Service Loan Forgiveness erases remaining balance after 120 may have access to payments if you work full-time for a government agency or nonprofit, but only if you stay on an income-driven plan and make all payments on time.
  • Interest does not accrue on subsidized loans while you are in school, but it does on unsubsidized loans, so paying accrued interest before repayment starts prevents it from being added to your principal.

How repayment speed affects your total cost

The faster you repay, the less interest you pay overall. This is true for every loan type — subsidized, unsubsidized, and PLUS loans. A $30,000 unsubsidized loan at a fixed 6.53% interest rate (the 2024–2025 rate for undergraduate loans) costs roughly $10,000 in interest over a standard 10-year repayment, but roughly $17,000 over 20 years. The extra 10 years of repayment adds $7,000 in interest alone.

You do not have to choose between a longer repayment plan and paying less interest. You can enroll in a standard 10-year plan but make extra payments whenever you can — even $50 or $100 extra per month cuts months off the end and saves hundreds in interest. The key is that extra money must go toward principal, not toward your next scheduled payment. When you send extra money, tell your loan servicer explicitly that you want it applied to principal.

If your monthly budget is tight, an income-driven plan lets you lower your payment now and still pay extra later. For example, you might pay $150 per month on an income-driven plan instead of $300 on the standard plan, freeing up $150 to put toward extra principal payments. Over time, this can cost less total interest than the standard plan because you are paying more principal each month even though your scheduled payment is lower.

Income-driven repayment plans and total cost

Federal student loans offer four income-driven repayment plans: Saving on a Valuable Education (SAVE), Income-Based Repayment (IBR), Pay As You Earn (PAYE), and Income-Contingent Repayment (ICR). Each calculates your monthly payment as a percentage of your discretionary income — the difference between your gross income and 150% to 225% of the federal poverty line, depending on the plan. Your payment can be as low as $0 if your income is below the threshold.

Income-driven plans reduce your total cost in two ways. First, a lower monthly payment means you can afford to pay more principal each month, which shortens repayment. Second, if you do not pay off the loan within the plan's forgiveness window (typically 20 to 25 years), any remaining balance is forgiven — though forgiven amounts may be taxable as income in that year. The SAVE plan, introduced in 2023, is the newest option and currently offers the lowest payments for many borrowers.

The trade-off is that income-driven plans extend repayment if you cannot afford to pay more than the plan requires. If your income is very low, your $0 payment means interest still accrues on unsubsidized loans, and that unpaid interest gets added to your principal (called capitalization). This increases what you owe. To avoid this, pay at least the accrued interest each month if you can, even on a $0 payment plan.

Making extra payments and paying accrued interest

Extra payments work only if they go toward principal. When you send money to your loan servicer, specify that you want it applied to principal, not held as a credit toward your next payment. Some servicers explore extra money automatically to principal; others hold it as a prepayment unless you instruct them otherwise. Call your servicer or log into your account to confirm how they handle extra payments.

Before you enter repayment, check whether you have accrued unpaid interest. Unsubsidized loans accrue interest while you are in school; subsidized loans do not. If you have unsubsidized loans and did not pay interest while in school, that interest gets added to your principal when repayment begins — a process called capitalization. Paying the accrued interest before repayment starts prevents this addition and saves you interest on interest over the life of the loan.

The amount of accrued interest depends on your loan balance, the interest rate, and how long you were in school. You can see accrued interest on your loan servicer's website or on your loan documents. If you cannot pay it all at once, even a partial payment reduces what gets capitalized.

Public Service Loan Forgiveness and total cost

Public Service Loan Forgiveness (PSLF) erases your remaining loan balance after you make 120 may have access to payments while working full-time for a U.S. government agency or a nonprofit organization with 501(c)(3) status. You must be on an income-driven repayment plan and make all payments on time. If you have $80,000 in loans and your income is low enough that your income-driven payment is $200 per month, you might pay only $24,000 total over 10 years before the remaining $56,000 is forgiven.

PSLF reduces your total cost because you stop paying before the loan is gone. However, the forgiven amount may be taxable as income in the year of forgiveness (though this tax treatment may change). You also must stay employed in a may have access to job and on an income-driven plan for the full 10 years — if you leave public service or switch to a different repayment plan, you lose PSLF may be able to access and must repay the full remaining balance.

To track progress toward PSLF, use the PSLF Help Tool on the Federal Student Aid website. This tool counts your may have access to payments and tells you how many more you need. You can also request a PSLF Limited Waiver information from your loan servicer to confirm your employment history and payment count.

Comparing loan types and interest rates

FAFSA offers three federal loan types: subsidized loans, unsubsidized loans, and Parent PLUS loans. Subsidized and unsubsidized loans have the same interest rate for a given year, but subsidized loans do not accrue interest while you are in school, enrolled at least half-time. Unsubsidized loans accrue interest from the moment they are disbursed.

Parent PLUS loans have a higher interest rate than undergraduate loans. For 2024–2025, Parent PLUS loans carry a 8.15% rate, compared to 6.53% for undergraduate loans. Over a 10-year repayment, this rate difference adds hundreds of dollars in interest. If you or your parents are considering Parent PLUS loans, compare the total cost against other options like private loans from banks or credit unions, which may offer lower rates to borrowers with good credit.

You cannot change the interest rate on a federal loan after it is disbursed, but you can refinance federal loans into a private loan to potentially lower the rate. Refinancing means you lose federal protections like income-driven repayment and PSLF may be able to access, so this trade-off is worth making only if the new rate is significantly lower and you do not need federal protections.

Strategies to minimize borrowing in the first place

The cheapest loan is the one you do not take. Before you borrow through FAFSA, explore other funding sources: scholarships, grants, work-study, and employer tuition information. Scholarships and grants do not require repayment. Work-study lets you earn money while in school without taking on debt. Some employers offer tuition reimbursement or information programs for employees or their dependents.

If you must borrow, borrow only what you need for direct education costs: tuition, fees, books, and required equipment. Avoid borrowing for living expenses if you can work, live with family, or reduce other spending. Each dollar you do not borrow saves you years of interest payments.

Also check whether you are borrowing the right type of loan. If you are an undergraduate, prioritize subsidized loans over unsubsidized loans, because subsidized loans do not accrue interest in school. If you are a graduate student, all federal loans are unsubsidized, so focus on keeping total borrowing as low as possible.

Frequently Asked Questions

Can I pay off my federal student loans early without a penalty?

Yes. Federal student loans have no prepayment penalty, so you can pay them off at any time without extra fees. Make sure your extra payments are applied to principal, not held as a credit toward future payments. Contact your loan servicer to confirm how they handle extra payments.

What happens to my total cost if I switch repayment plans?

Switching plans changes your monthly payment and how long you repay, which affects total interest. Moving to an income-driven plan lowers your payment but may extend repayment and increase total interest — unless the lower payment lets you afford extra principal payments. Switching back to the standard 10-year plan shortens repayment and reduces total interest, but raises your monthly payment.

Does consolidating my loans reduce my total cost?

Consolidation combines multiple loans into one, which simplifies payments but does not lower your interest rate or total cost. The new consolidated loan's interest rate is the weighted average of your old rates, rounded up to the nearest one-eighth of a percent. You may reduce total cost by consolidating and then switching to an income-driven plan or pursuing PSLF, but consolidation itself does not save money.

What if I cannot afford to make extra payments right now?

Focus on making your regular payment on time. Even if you cannot pay extra now, you may be able to later — a raise, bonus, or tax refund can go toward principal. An income-driven plan keeps your payment manageable while you wait for your financial situation to improve. Once it does, any extra money you can send reduces your total cost.

Is the interest on my federal student loans tax-deductible?

Yes, up to $2,500 of student loan interest paid in a tax year is deductible from your income, which lowers your taxable income. This deduction phases out at higher incomes. The deduction does not reduce your loan balance, but it does reduce your federal income tax, which frees up money you can use for extra loan payments.