Student Loan Payoff Planner

You graduated with $38,000 in federal loans at 5.5% average. The standard 10-year plan puts your payment at $412/month—tight on a $48,000 starting salary. You consider income-driven repayment to lower the monthly burden, but nobody explains that stretching to 20 years doubles your total interest from $11,400 to $23,000+. The "affordable" payment costs you an extra car.

This student loan payoff calculator compares three paths: standard repayment, income-driven plans, and accelerated payoff with extra payments. You see not just monthly amounts but total interest, payoff dates, and how each strategy affects your long-term cost. The amortization schedule breaks down every payment so you know exactly when you cross the halfway mark.

Whether you're choosing between SAVE, IBR, or aggressive payoff, this tool shows the numbers behind each option—so you can pick the strategy that fits your income, goals, and timeline.

1. Enter your loan details: Input each loan's balance and interest rate. Add multiple loans separately if you have subsidized and unsubsidized or loans from different years.
2. Set the standard term: Default is 10 years (federal standard). Adjust to see how longer terms affect payments and total interest.
3. Add extra payment amount: Enter any additional monthly amount you could pay beyond the minimum. Even $50-100 extra makes a meaningful difference.
4. Configure income settings: For the income-driven comparison, enter your gross annual income, family size, and expected income growth rate.
5. Compare all three scenarios: Review standard plan, income-based plan, and accelerated payoff side by side. The charts show how your balance declines under each approach.

Extra payments to principal: Every dollar above the minimum reduces your balance before the next interest calculation. $100 extra monthly on $35,000 at 6% saves ~$4,000 in interest and shortens payoff by 3+ years.

Biweekly payments: Paying half your monthly amount every two weeks results in 26 half-payments (13 full payments) per year instead of 12. That extra payment goes entirely to principal with minimal budget impact.

Targeting highest rates first: If you have multiple loans, the avalanche method directs extra payments to the highest interest rate first. This minimizes total interest across your entire loan portfolio.

Applying windfalls: Tax refunds, bonuses, or side income can make large dents in principal. A $3,000 tax refund applied to a $30,000 loan at 6% saves roughly $2,500 in interest over the remaining term.

Refinancing (private loans): If you have private loans or don't need federal protections, refinancing to a lower rate can save thousands. A drop from 7% to 5% on $40,000 saves ~$4,500 over 10 years.

Standard payments use the amortization formula:

Where P = principal, r = monthly rate (APR ÷ 12), n = total payments. Example: $30,000 at 5.5% for 10 years = $326/month.

Income-driven estimate: Simplified as (Gross Income × Discretionary %) × Payment % ÷ 12. Actual federal IDR uses poverty guideline thresholds that vary by family size and location.

Assumptions: Fixed interest rates, monthly compounding, consistent on-time payments, and no deferment or forbearance periods. IDR estimates do not account for annual recertification, capitalized interest, or forgiveness tax implications.