Student Loan Payoff Calculator
Compare income-driven plans vs. aggressive payoff. See how extra payments shave years off your debt and cut thousands in interest.
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These calculators provide estimates for educational purposes only. Results are not guaranteed and should not be treated as financial advice. Always consult a qualified professional before making major financial decisions.
The average class of 2026 graduate leaves school with $37,000 in student debt. At 5.5% APR on the standard 10-year plan, they pay $11,300 in interest. Yet 1 in 5 borrowers who enter income-driven repayment never make enough progress and end up with forgiven balances treated as taxable income. Your repayment strategy determines whether you pay $11K or $50K.
Read more - how it works, tips & FAQs
How to use this calculator
- Enter your total student loan balance and the weighted average APR across all loans.
- Choose your repayment strategy: standard, income-driven (IDR), or accelerated with extra payments.
- See a side-by-side comparison of each strategy showing total interest and payoff date.
- Toggle between standard and extra payment scenarios to see how much you can save.
How to calculate this by hand
Standard: M = P × [r(1+r)ⁿ] / [(1+r)ⁿ – 1]. Income-driven: Payment = (AGI – 150% poverty line) × 10–20%
Standard repayment uses the amortization formula over 10 years. Income-driven repayment (IBR, PAYE, REPAYE, SAVE) caps payments at a percentage of discretionary income — typically (Adjusted Gross Income minus 150% of the federal poverty guideline) × 10–20%. Lower payments but longer term means more total interest and potential forgiven balance treated as taxable income.
$30,000 Loan -- Standard vs. $100 Extra
- Loan: $30,000 at 5.5% APR
- Standard 10-year payment: $326/month
- Total interest on standard: $9,070
- With $100 extra ($426/month): pays off in 6.5 years
- Total interest with extra: $5,590
- Savings: $3,480 and 3.5 years of payments
Result: An extra $100/month on a $30,000 student loan saves $3,480 in interest and gets you debt-free 3.5 years sooner.
Tips
- Target loans above 5% APR first: If you have multiple loans at different rates, every extra dollar should go to the highest-rate loan first (avalanche method). A 6.8% loan costs nearly twice the interest of a 3.8% loan over the same term.
- Specify extra payments as principal-only: Many servicers apply extra payments to future interest by default. You must check a box, write a note, or call to designate extra as principal-only. Otherwise, you lose the benefit of early payoff.
- Do not refinance federal loans without understanding what you lose: Refinancing federal loans to private means losing access to IDR plans, loan forgiveness (PSLF), and deferment/forbearance options. Only refinance federal loans if you are certain you will not need these protections.
- Recertify your IDR plan annually: Income-driven repayment requires annual income recertification. Miss it and your payment jumps to the standard 10-year amount, and unpaid interest capitalizes (is added to principal). Set a calendar reminder every 11 months.
Common mistakes to avoid
- Choosing IDR without understanding the tax bomb - Forgiven balances under IDR are treated as taxable income. A $40,000 forgiven balance in 25 years could trigger a $8,000-$14,000 tax bill in the year of forgiveness. Plan for this or avoid IDR if your balance is manageable.
- Ignoring interest capitalization events - When you leave school, enter repayment, or change IDR plans, unpaid interest is added to your principal. This increases the total amount that accrues interest going forward. Make interest-only payments during grace periods to avoid capitalization.
- Paying the minimum on a 6.8%+ loan while investing - A guaranteed 6.8% return (by paying off debt) beats a speculative 7% market return, especially after taxes. Pay off loans above 5-6% before investing beyond your employer match.
FAQ
Should I use the standard or income-driven plan?
If your loan balance is less than 1.5x your annual salary, the standard plan usually wins. If it is more, IDR may be necessary. Run both scenarios in our calculator -- the answer depends on your specific numbers.
What happens if I pay off my student loans early?
There is no prepayment penalty on federal student loans. Private loans may have prepayment penalties -- check your contract. Paying early saves all future interest and frees up cash flow.
Can I deduct student loan interest on my taxes?
Yes, up to $2,500 of student loan interest paid is tax-deductible if your modified AGI is under $85,000 (single) or $175,000 (married filing jointly). This reduces your effective interest rate by 1-2%.
Related resources
- Complete Debt Payoff Roadmap - A step-by-step plan to become debt-free using proven strategies.