Calculate your monthly student loan payment, total interest cost, and payoff date. Compare standard repayment with income-driven plans and see the impact of extra payments.
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Parents of a 5-year-old want to fully fund 4 years at Ohio State University (current cost ~$31,000/year in-state including room/board). They're opening a 529 plan today.
Takeaway: Ohio's 529 (CollegeAdvantage) provides a state tax deduction up to $4,000/yr per beneficiary — worth ~$190/yr at Ohio's 4.75% rate. If the child gets a scholarship, up to $10,000 can be rolled to a Roth IRA penalty-free under 2024 SECURE Act rules.
Using general 2-3% inflation to project future tuition underestimates costs. Published tuition at 4-year public universities has increased at roughly 4-5% annually for 20 years. Private schools run 3-4%. A $30,000/year school today costs ~$50,000/year in 13 years at 4% education inflation.
All 529 plans offer age-based portfolios that shift toward bonds as college approaches. Expense ratios vary from 0.05% (Utah's my529) to 0.9%+ in some state plans. You can use any state's 529 regardless of where your child attends college — your own state's plan is only worth it if it offers a state tax deduction.
Parent-owned 529 assets count as 5.64% toward Expected Family Contribution (EFC) in FAFSA. Student-owned assets count as 20%. High 529 balances reduce need-based aid dollar-for-dollar above your EFC threshold. For families close to aid cutoffs, this interaction matters significantly.
Tuition gets the attention, but room and board at a typical residential university adds $12,000-$18,000/year. Total cost of attendance including books and personal expenses runs $32,000-$80,000/year depending on institution type. Make sure your projection uses total COA, not tuition alone.
Based on your inputs
10-year repayment
| Monthly Payment | $398 |
|---|---|
| Total Interest | $12,754 |
| Total Amount Paid | $47,754 |
| Payoff Date | May 2036 |
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The average student loan borrower in the U.S. graduates with approximately $37,900 in federal student loan debt as of 2024. When you add private loans, the total can be significantly higher. Your loan's total cost depends on three factors: the principal balance, the interest rate, and the repayment timeline. A $35,000 loan at 6.53% on the standard 10-year plan costs $398 per month and $12,767 in total interest. Extend that to 20 years and your monthly payment drops to $263 but total interest jumps to $28,098 — more than double. Understanding this trade-off between monthly cash flow and total cost is the foundation of smart repayment strategy.
Federal student loans offer several repayment plans. The Standard Plan (10 years, fixed payments) costs the least overall. The Graduated Plan starts with lower payments that increase every two years over 10 years. The Extended Plan stretches payments to 25 years for borrowers with more than $30,000 in loans. Income-driven plans (SAVE, PAYE, IBR, ICR) base payments on income and family size. The SAVE plan, introduced in 2023, is the most generous for undergraduates: payments are capped at 5% of discretionary income (income above 225% of the poverty line), and balances under $12,000 are forgiven after just 10 years of payments.
Federal student loan rates are set annually by Congress based on the 10-year Treasury note. For the 2024-25 academic year: Direct Subsidized and Unsubsidized Loans for undergrads carry a 6.53% fixed rate. Graduate students pay 8.08% on Direct Unsubsidized Loans. Parent and graduate PLUS Loans carry a 9.08% rate. These rates are fixed for the life of the loan. Private loan rates vary significantly: borrowers with excellent credit and a cosigner may find rates as low as 4-5%, while those with lower credit scores may face 10-15% or higher. Unlike federal rates, private rates can be variable, meaning they may increase over time.
Making extra payments is the single most effective strategy for reducing your total loan cost. Even small amounts make a significant difference because extra payments go entirely to principal, reducing the base on which future interest accrues. On a $35,000 loan at 6.53%: adding $50/month saves $2,800 in interest and pays off the loan 14 months early. Adding $100/month saves $5,100 and finishes 26 months early. Adding $200/month saves $8,100 and finishes 43 months early. The key is specifying that extra payments should be applied to principal, not advancing your due date. Contact your servicer or check your online portal to ensure this is set correctly.
IDR plans are designed for borrowers whose standard payments are high relative to their income. Under the SAVE plan, a single borrower earning $55,000 with $35,000 in undergraduate loans would pay approximately $115/month — compared to $398 on the standard plan. After 20 years of payments, any remaining balance is forgiven. However, the forgiven amount may be taxable as income (though a current provision makes IDR forgiveness tax-free through at least 2025). IDR plans require annual income recertification. If your income rises significantly, your IDR payment could approach or exceed the standard payment, and you may want to switch plans or refinance.
Refinancing replaces one or more loans with a new private loan at a lower interest rate. It makes sense when you have stable income, good credit (700+), and do not need federal protections like IDR or Public Service Loan Forgiveness. A borrower who refinances $35,000 from 6.53% to 4.5% saves approximately $4,000 over 10 years. However, refinancing federal loans into private loans permanently forfeits access to IDR plans, forgiveness programs, and federal forbearance options. Never refinance if you work in public service or may need income-driven protections in the future.
Federal loans should always be your first choice. They offer fixed interest rates, income-driven repayment plans, deferment and forbearance options during financial hardship, loan forgiveness programs (PSLF, IDR forgiveness), and no credit check for most loans. Private loans should only be used after exhausting federal aid. They can offer lower rates for top-credit borrowers but provide no safety nets. If you lose your job with federal loans, you can switch to an IDR plan with $0 payments. With private loans, your options are limited to whatever your lender offers — often nothing.
Do not ignore your loans during the grace period. Interest on unsubsidized loans accrues from disbursement, not from when repayment starts. Making even interest-only payments during school and the grace period prevents capitalization (interest being added to principal). Do not default on federal loans — the consequences include wage garnishment, tax refund seizure, and damaged credit. If you are struggling, contact your servicer immediately to explore deferment, forbearance, or IDR. Do not pay for loan forgiveness services. Everything offered by paid services can be done for free through your servicer or studentaid.gov.
For the 2024-25 academic year, the federal rate is 6.53% for undergraduate Direct Loans, 8.08% for graduate Direct Unsubsidized Loans, and 9.08% for Direct PLUS Loans. Private loan rates vary by lender and creditworthiness, typically ranging from 4% to 15%.
The Standard Repayment Plan uses fixed monthly payments over 10 years (120 payments). This minimizes total interest paid but results in the highest monthly payment compared to income-driven or extended plans.
IDR plans cap payments at 10-20% of discretionary income. After 20-25 years, remaining balances are forgiven (though forgiveness may be taxable). The SAVE plan caps undergraduate payments at 5% of discretionary income with forgiveness after 20 years.
Extra payments go directly to principal, reducing future interest charges. An extra $100/month on a $35,000 loan at 6.5% saves about $5,000 in interest and cuts 3 years off the repayment period. Always specify that overpayments apply to principal.
Federal consolidation combines multiple federal loans into one payment with a weighted average interest rate. It simplifies payments but may increase total interest if it extends the term. Private refinancing can lower your rate but forfeits federal benefits like IDR and forgiveness.
For the 2024-25 academic year, federal Direct Subsidized and Unsubsidized loans for undergraduates carry a 6.53% fixed rate. Graduate loans are at 8.08%. PLUS loans for parents and graduates are at 9.08%. Rates are set annually each July.
Subsidized loans do not accrue interest while you are enrolled at least half-time. Unsubsidized loans accrue interest from disbursement. Subsidized loans are only available to undergraduates with demonstrated financial need. Both have the same interest rate.
Dependent undergrads can borrow $5,500-$7,500 per year with a $31,000 aggregate limit. Independent undergrads can borrow up to $12,500 per year with a $57,500 limit. Graduate students can borrow up to $20,500 per year with a $138,500 aggregate limit.
Making interest-only payments while in school prevents interest capitalization, saving thousands over the loan life. On a $30,000 unsubsidized loan at 6.53%, paying $163 monthly interest in school saves approximately $4,000 over the standard repayment term.
Contact your loan servicer immediately about income-driven repayment plans, deferment, or forbearance options. Federal loans offer multiple relief programs. Never ignore payments since default damages credit scores and can trigger wage garnishment and tax refund seizure.
M = P [r(1+r)^n] / [(1+r)^n - 1]
M = monthly payment, P = principal, r = monthly rate, n = total payments
Every formula on this page traces to a federal agency, central bank, or peer-reviewed institution. We cite the rule-makers, not secondhand blogs.
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Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.