Loan Payoff Calculator – When Will Your Loan Be Paid Off?

Watch the balance fall

The teal curve is your current plan. Add an extra monthly payment and an amber curve appears — ending sooner, because less balance means less interest every single month.

Working to a deadline? Solve the payment instead

Flip the question around: pick the month you want the loan gone, and this mini-tool works out the monthly payment that lands exactly on it — the same math lenders use to set a payment, run in reverse.

Keep exploring

Three companion tools for loans and debt.

How it works

Three steps from balance to debt-free date.

The math behind a loan payoff

Go deeper

Why extra payments punch above their weight — and your first year in detail.

Three ways to finish sooner, compared on the same math

Extra monthly payments, a lump sum, and a cheaper rate all attack the same thing: the balance that interest is charged on. The comparison below uses the month-by-month simulation on this page, with no fees and a fixed rate, so the differences are pure arithmetic, not sales talk.

An extra monthly payment is the most reliable of the three, because it repeats. Every extra dollar goes to principal after that month’s interest is covered, and every dollar of principal removed stops charging interest in every month that follows. That is why a modest extra payment saves far more than its face value over the life of a loan. Take a $10,000 loan at 6 percent, paid at $200 a month: on its own it takes 58 months and costs $1,536.14 in interest. Add $50 a month, and the same loan clears in 45 months with $1,185.17 of interest — 13 months sooner and $350.97 cheaper, from $50 at a time. The same pattern holds at larger sizes. A $20,000 loan at 7.5 percent, paid at $400 a month, takes 61 months and costs $4,055.39 in interest; adding $100 a month brings it to 47 months and $3,086.63 of interest, saving $968.76 and 14 months. In both cases the extra money is less than a third of the regular payment, yet it removes more than a fifth of the interest, because early principal reductions compound in your favour for the whole remaining term.

A lump sum works the same way, but its power depends on when it lands. A lump sum paid in month 6 removes principal from month 7 onward, so it saves almost as much interest as the same total spread over the first year, and far more than the same amount paid near the end of the loan, when little interest is left to save. That is why this calculator asks which month a lump sum falls in: timing is part of the answer, not a detail. If you expect a bonus, a tax refund, or the proceeds of a sale, try it in the lump-sum field at the month you would actually receive it, and compare the result with spreading the same total as a monthly extra. Whichever wins on your numbers is the better plan for your loan, and the gap between them tells you how much timing is worth.

A cheaper rate helps differently. Refinancing to a lower rate shrinks the interest slice of every payment from the first month, which leaves more of each payment for principal without you paying a dollar more. But a refinance usually carries fees, and sometimes a new term that restarts the clock. Before comparing a new rate with extra payments, put the new rate, the fees, and the new term into the same frame: the question is not which monthly payment is lower, but which plan leaves you debt-free sooner at a lower total cost. Extra payments have no fees and no paperwork, and they can start with the very next payment. A refinance can beat them when the rate drop is large, but it has to clear its fees first, and this page’s solver can show you the payment a deadline requires so you can judge both options against the same finish line.

All four rows are computed by the same simulation this calculator runs: interest each month on the remaining balance, the rest of the payment to principal, exact unrounded balances throughout. Your own loan will differ, because your balance, rate, and payment differ, but the shape of the result will not: extra principal early beats extra principal late, and a smaller balance is the only thing that makes every future month cheaper.

Reading your result like a lender does

Four numbers, four different jobs. Confusing them is how payoff plans go wrong.

The headline number is the months to debt-free, and the date that follows from it. It counts forward from the current month, so if you start the plan a month later, the date moves a month later too. Behind it sits the final payment, which is almost always smaller than the regular payment, because the last month only needs whatever balance and interest remain. Budget for the regular payment every month and treat the smaller final payment as a pleasant surprise, not as money you can spend early: the simulation already assumes you pay in full on time, every month, and a missed or short payment pushes the finish line out.

Total interest is the price of time. It is the difference between everything you will pay and the balance you started with, and it is the number extra payments attack. Total paid is the sum of the two: balance plus total interest, including the final partial payment. If those two numbers ever look inconsistent, check the final payment first — a loan that ends with a $313.62 final payment instead of a full $350 payment has $36.38 less in its total than a naive multiplication of payment by months would suggest. That is not an error. It is the loan clearing exactly, rather than overpaying in the last month.

The error message deserves attention too. If your payment is no more than one month’s interest, the balance grows instead of shrinking, and no payoff date exists. On the $15,000 example at 9 percent, one month’s interest is $112.50, so any payment at or below that figure cannot clear the loan. The fix is not mysterious: the payment must exceed the monthly interest by enough that the principal slice is meaningful. Raising it by $25 or $50 a month is often enough to turn a loan that never clears into one with a real finish date, and the solver on this page can tell you the exact payment a deadline of your choosing requires.

Finally, remember what this simulation leaves out, because lenders do not. It assumes a fixed rate, monthly payments made on time, and no fees, taxes, or prepayment penalties. Real loans accrue interest daily, so a lender’s payoff quote for a specific day will differ slightly from a monthly simulation, and it will include any fees the loan carries. Use this calculator to choose the plan, and use the lender’s written payoff quote to execute the final payment. The plan is yours to make; the closing figure is theirs to state.

A payoff plan checklist, before you send extra money

Five checks that cost nothing and prevent the commonest payoff mistakes.

First, confirm that extra payments are applied to principal. Most lenders do this, but some apply an extra payment to the next month’s bill instead, which advances your due date without shrinking the balance as fast. Ask for the principal-only instruction in writing if your lender offers it, and check the first statement after an extra payment to see the balance fall by the full extra amount. If it did not, the instruction was not applied, and a phone call is worth more than a larger extra payment sent into the wrong bucket.

Second, check for a prepayment penalty. Most modern personal loans, auto loans, and credit cards have none, but some mortgages and older loans do, and a penalty can erase the first months of interest saved. The penalty terms are in the loan agreement, not in the monthly statement, so read the agreement before committing to a large lump sum. A small monthly extra is rarely penalised where a large lump sum might be, which is another reason to test both shapes in the calculator before choosing.

Third, keep a cash buffer before accelerating a payoff. Extra payments are hard to undo: money sent to a lender is no longer available for an emergency, while money kept aside can be sent later. A payoff plan that leaves you with no buffer trades one risk for another. The usual shape of a sound plan is a modest emergency reserve first, then steady extra payments, then lump sums from windfalls — in that order, and only when the reserve is already in place.

Fourth, automate the extra payment. A plan that depends on remembering to pay extra every month will skip months, and skipped months are exactly the months when the extra payment would have done the most work, because the balance was largest. Set the extra amount as a standing instruction with the regular payment, and re-run this calculator once a year, or whenever the rate, the balance, or your income changes, so the finish date you are working toward stays honest.

Fifth, decide what the finish date is for. A deadline changes the payment, and the solver on this page exists for that decision: pick the month you want the loan gone, and it returns the payment that lands exactly there. Working backward from a date — a move, a retirement, a child starting school — turns a vague wish to be debt-free into a monthly figure you can test against your budget today. If the figure does not fit, lengthen the deadline by a few months and test again, rather than setting a payment you will abandon. A plan you keep beats a plan that looks heroic on paper.

Which loan first? Avalanche vs snowball

With several loans, the order matters. The avalanche method attacks the highest interest rate first, whatever the balance: it saves the most interest, because every extra dollar goes where the interest charge is steepest. The snowball method attacks the smallest balance first, whatever the rate: it clears a loan sooner, and the cleared loan frees its payment for the next one, which keeps motivation high.

The arithmetic favours the avalanche, and the psychology favours the snowball. The difference between them is usually smaller than people expect, because the rates on most household loans sit within a few points of each other — but where one debt carries a much higher rate, usually a credit card, the avalanche wins by a margin worth having. The honest way to choose is to run both orders in a debt payoff calculator, look at the difference in total interest and in months, and pick the order you will actually stick to: a plan followed beats a plan abandoned, whatever its arithmetic.

Biweekly payments: the extra payment you never notice

Biweekly payments are the extra payment most people never notice. Instead of one monthly payment, pay half the monthly amount every two weeks. There are 26 two-week periods in a year, so 26 half-payments add up to 13 monthly payments instead of 12 — one extra monthly payment a year, made in small pieces, without a noticeable change to the budget.

On a $15,000 loan at 9% paid at $350 a month, which takes 52 months and costs $3,163.62 in interest, adding one extra $350 payment a year brings the payoff to 48 months and cuts interest to $2,929.23, saving $234.39. The saving is smaller than the $837.63 from adding $100 every month, because the extra money is smaller — $350 a year against $1,200 a year — but the method asks for no willpower: the extra payment is built into the schedule, and the months it saves arrive without a decision each month. The one condition is that the lender applies the extra half-payments to principal rather than holding them; confirm the treatment in writing before starting.

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