Gathering the extra dollars that pay off your debt years early.
Model recurring extra payments or a one-time windfall against your mortgage, auto loan, or student loan — and see, to the month, exactly how much interest you keep and how much sooner you're free.
- No signup required
- Nothing you enter is stored
- Bank-grade amortization math
Your accelerated payoff, calculated live
Adjust any field and your results update instantly — no page reloads, nothing sent to a server.
From loan statement to payoff plan in four steps
You don't need a spreadsheet or a finance degree. Everything the calculator needs is already on your latest loan statement.
Enter your loan details
Pull your current balance, interest rate, and remaining term from your latest statement or lender portal.
Add your extra payments
Choose one or combine all three: a recurring monthly amount, one payment a year, or a single lump sum on a specific date.
Read your results instantly
Interest saved, months shaved off, and your new payoff date update live as you adjust any field — no submit button needed.
Export your schedule
Open the annual breakdown and download a CSV to share with a partner, advisor, or your lender.
What each number on the results panel actually means
Total interest saved
The difference between the interest you'd pay on your lender's original schedule and the interest you'd pay by making the extra payments you specified — the direct dollar value of accelerating your loan.
Payoff time saved
How many years and months earlier your loan reaches a zero balance compared to its original term — the time you get back, whether that means an earlier retirement or one less monthly bill.
New payoff date
The projected calendar month your loan is fully paid off under the accelerated plan — the date to circle, assuming payments continue as modeled.
Factors that affect what extra payments actually save you
The math is only half the picture. These four factors determine whether your projected savings show up in real life.
Prepayment penalties
Some mortgages, auto loans, and personal loans charge a fee for paying down principal ahead of schedule, especially within the first few years. Check your note or ask your lender before committing to a plan.
Payment allocation order
Unless you instruct your servicer otherwise, extra funds are sometimes applied to future scheduled payments instead of principal — which quietly erases the benefit this calculator projects. Always confirm "principal only" in writing.
Opportunity cost
Every dollar sent to principal is a dollar not invested elsewhere. Compare your loan's interest rate to what you could reasonably expect from other uses of that money, like an emergency fund or retirement account.
Tax implications
Mortgage interest is often deductible, so reducing it can slightly change your tax position. Student loan interest deductions phase out at certain incomes. A tax professional can tell you whether this changes your math.
You've run the numbers. Here's what to do with them.
One calculator, every extra-payment strategy
Whether you're searching for a mortgage extra payment calculator, an auto loan payoff calculator with extra payments, or a way to see how much interest you save paying extra on a student loan, the underlying math is the same fixed-rate amortization your lender already uses — we just make it visible and interactive.
Homeowners often ask how a biweekly mortgage payment calculator compares to simply adding a flat extra amount each month. Both strategies increase your effective annual payment, but modeling them side by side — rather than trusting a rule of thumb — shows you the real difference in interest saved and in your new mortgage payoff date.
If a bonus, tax refund, or inheritance just landed in your account, you're likely looking for a lump sum loan payoff calculator to see whether applying it now beats investing it or spreading it across several months. Enter the amount and the date, and compare it directly against a recurring extra payment plan.
Car buyers frequently look for a car loan early payoff calculator to decide whether an extra $100 a month is worth the tighter monthly budget. Because auto loans typically run shorter terms than mortgages, extra principal payments often produce a proportionally larger reduction in total interest paid.
Graduates managing federal or private debt search for a student loan extra payment calculator to understand how accelerated payments interact with their loan term — useful context before deciding between aggressive payoff and other financial priorities like retirement contributions or an emergency fund.
However you found this page — searching for an early mortgage payoff calculator with amortization schedule, an extra principal payment calculator, or simply "how to pay off my loan faster" — the tool above the fold answers the question with your own numbers, not a generic example.
Everything borrowers ask us before they start
How does making extra payments reduce my total interest?
Is there a difference between paying extra monthly versus a one-time lump sum?
Will my lender apply my extra payment to principal automatically?
Are there prepayment penalties I should worry about?
Does paying off my loan early hurt my credit score?
Can I use this calculator for any type of loan?
How accurate are the results this calculator shows me?
See your new payoff date in the next 30 seconds.
No account, no email required — just your loan details and a clearer picture of what's possible.
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