This loan payoff calculator answers the two questions every borrower eventually asks: when will this loan actually be gone, and how much faster could I be free if I paid a little extra? Enter your current balance, rate, and monthly payment, then add an extra monthly amount or a one-time lump sum — the calculator instantly shows your new payoff date, the months you shaved off, and the interest you never have to pay.

It works for any fixed-rate installment loan: auto loans, personal loans, student loans, home loans and mortgages, RV loans, and medical debt. If you're financing a new or used vehicle, our dedicated Car Loan Calculator lets you model the full purchase (price, down payment, trade-in) and compare loan terms side by side. Because this payoff calculator starts from your current balance rather than the original loan amount, it's ideal for loans you're already partway through — the situation most payoff calculators handle poorly.

Extra payments are disproportionately powerful because every extra dollar goes straight at principal. On a $20,000 balance at 7% with a $450/month payment, adding just $100/month pays the loan off roughly a year sooner and cuts hundreds of dollars in interest. The math compounds in your favor: less principal today means less interest accrues tomorrow, which means even more of next month's payment hits principal.

The calculator runs a month-by-month amortization simulation twice — once with your current payment, once with your accelerated plan — and compares them:

The loop repeats until the balance hits zero. The gap between the two payoff dates is your time saved; the gap between the two cumulative interest totals is your interest saved.

Worked example — $20,000 at 7% APR, $450/month: the baseline payoff takes about 51 months with roughly $3,000 in total interest. Add $100/month and payoff drops to about 42 months with around $2,400 in interest — nine months sooner and ~$600 kept in your pocket. Add a $2,000 lump sum on top and you're done in about 37 months.

One guard rail: if your payment doesn't exceed the first month's interest, the balance can never reach zero — the calculator will flag this and show the minimum payment that makes progress. This matters most on high-rate credit card balances (see our Credit Card Interest Calculator to understand how daily compounding works) and interest-only loans, where the scheduled payment covers interest alone and the principal never shrinks until you voluntarily pay extra. For an interest-only loan, every dollar of "extra payment" in this calculator is a dollar of real principal reduction — which is exactly why an interest-only loan payoff plan is built entirely from extra payments.

Car loans are the most common loan Americans pay off early, and for good reason: used-car APRs averaged over 11% in recent years per Experian's Consumer Credit Review, and a car is a depreciating asset — the faster you eliminate the loan, the sooner you stop paying interest on something losing value.

To model your car loan here: enter your remaining balance (from your lender's app or latest statement — not the original loan amount), your APR, and your current monthly payment. Then test extra payment amounts. Two practical notes for auto loans:

• Confirm extra payments apply to principal. Some auto lenders default to treating extra money as an "advance payment" of next month's bill, which saves you nothing. Call or check your lender's payment portal for a "principal only" option.
• Check for precomputed interest. A small minority of subprime auto loans use the Rule of 78s or precomputed interest, where early payoff saves less than simple-interest math suggests. Your contract will say.

The same simulation works for a home loan or mortgage — enter your remaining principal, rate, and the principal-and-interest portion of your payment (exclude escrow for taxes and insurance). Because mortgage balances are large and terms are long, the numbers get dramatic: an extra $200/month on a $300,000 balance at 6.5% saves roughly six figures in interest and pays the loan off years early.

Popular acceleration strategies you can model here:

• Round-up: if your P&I is $1,847, pay $2,000. Enter the $153 difference as your extra payment.
• One extra payment per year: divide your monthly payment by 12 and enter that as the monthly extra — mathematically equivalent to a 13th payment, and close to what a biweekly payment plan achieves without the third-party fees.
• Windfall lump sum: tax refund, bonus, or RSU vest — enter it in the lump-sum field to see the one-time impact.

Before accelerating a mortgage, weigh the interest rate against what the money could earn elsewhere. Paying extra on a 3% pandemic-era mortgage while high-yield savings accounts pay more than that is usually a losing trade; paying extra on a 7%+ loan is a guaranteed, tax-free return few investments can match. U.S. mortgages generally have no prepayment penalty on conforming loans originated after 2014, per CFPB rules, but check your note if your loan is older or non-conforming.

For a full affordability picture before you buy, pair this with our Advanced Mortgage Calculator or the state-by-state mortgage affordability pages.

For student loan payoff, the same principle applies with one big caveat: strategy depends on whether your loans are federal or private. Paying extra on private student loans is straightforward interest savings. On federal loans, prepaying can conflict with income-driven repayment forgiveness or PSLF — if you're pursuing forgiveness, extra payments may literally be money wasted.

If you're aggressively paying down federal or private student debt with no forgiveness path, enter your balance and rate here to see your payoff timeline, and use our dedicated Student Loan Repayment Calculator to compare repayment plans first. When prepaying, instruct your servicer in writing to apply extra amounts to principal on your highest-rate loan — the federal default is to advance your due date instead.

Early payoff is a guaranteed return equal to your interest rate — but it's not always the best use of money. Run through this order of operations first:

1. Employer 401(k) match first. A 50–100% instant return beats paying off any consumer loan. If you've already borrowed against your 401(k), use our 401(k) Loan Payoff Calculator to see the true opportunity cost before deciding whether to prepay it.
2. High-rate debt next (roughly 8%+). Credit cards, subprime auto, personal loans — attack these hard. If you're juggling several, our Debt Payoff Optimizer sequences them by snowball or avalanche.
3. Emergency fund. 3–6 months of expenses before aggressive prepayment — an early-paid car loan won't help you in a job loss, but cash will.
4. Low-rate debt last (under ~5%). Mathematically, investing usually wins here. Emotionally, being debt-free has real value the spreadsheet can't capture — both are legitimate choices.

Car loans are where extra payments show results fastest, because the balances are small enough that even $50–$100 a month meaningfully shortens the term. This tool works as an auto loan payoff calculator with extra payments: enter your current balance (not the original loan amount), your rate, and your regular payment, then add the extra amount you can commit each month.

Two things to confirm with your lender before you start: that extra amounts are applied to principal (not held as a prepayment of next month's bill), and that the loan has no prepayment penalty — most auto loans don't, but some subprime contracts use precomputed interest where early payoff saves little. If your rate is above ~10%, also compare refinancing with the Loan Refinance Calculator — combining a lower rate with extra payments compounds the savings.

Used as a home mortgage loan payoff calculator, the same math scales dramatically — mortgage balances are large and terms are long, so extra payments early in the loan eliminate decades of compounding interest.

The earlier in the term you start, the bigger the effect — in year one, most of each payment is interest, so every extra dollar goes straight at the principal that generates it. A one-time lump sum (bonus, tax refund, inheritance) works the same way; use the lump-sum field above to model it. Before committing, weigh the alternative: money locked into home equity earns your mortgage rate, guaranteed, but is illiquid. If your rate is below what you'd expect from investing, or you lack an emergency fund, prepaying may not be the best use of the cash. The Refinance Analyzer covers the other lever — lowering the rate itself — and the U.S. Consumer Financial Protection Bureau's guidance on paying off a mortgage early walks through the trade-offs in depth.

An interest-only loan is the special case where the payoff math breaks: if your payment equals exactly the monthly interest, the balance never shrinks — the payoff date is literally never. That's why this calculator warns you when your payment doesn't exceed the monthly interest.

To use this as an interest-only loan payoff calculator: enter your balance and rate, set the payment to your interest-only amount, and put everything above it in the extra-payment field. The result shows exactly when the loan dies and how much total interest you avoid versus staying interest-only forever. This matters most for HELOCs in their draw period — the HELOC Calculator models the interest-only-to-amortizing payment jump specifically — and for interest-only mortgages approaching the end of their IO period, where the required payment can rise sharply overnight.