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Car Loan Early Payoff
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This calculator provides estimates for informational purposes only and does not constitute financial, medical, legal, or tax advice. Always consult a qualified professional about your specific situation.
How Extra Auto Loan Payments Are Calculated
Adding a flat extra amount to an auto loan’s monthly payment goes straight toward the
principal, which shrinks both how much interest accrues going forward and how many payments are
left. Enter your current loan balance, interest rate, and remaining term, plus an extra amount
you plan to pay every month, and this calculator simulates the new payoff schedule to show how
much time and interest that extra payment saves.
This is distinct from the Mortgage Payoff Calculator calculator, which models switching to
a biweekly payment schedule specifically — this models the simpler, more common lever of a flat
extra amount added to your existing monthly payment.
The Formula
Standard schedule (unchanged):
Standard Payment=Current Balance×(1+r)n−1r(1+r)n
With the extra payment, the loan is simulated month by month at
New Payment=Standard Payment+Extra Payment
until the balance reaches zero, tracking the actual number of months and interest paid.
Months Saved=n−New Payoff Months
Worked Example
A $15,000 balance at 7% APR with 36 months remaining, adding $100 extra every
month:
Standard Payment: about $463.16/month, for a standard total interest of about
$1,673.63.
With the extra $100/month ($563.16/month total), the loan is paid off in 30 months
instead of 36 — a savings of 6 months.
Total interest with the extra payment: about $1,349.64, a savings of about $323.99
compared to the standard schedule.
Key Factors to Consider
The savings are larger, in both dollars and percentage terms, earlier in a loan’s term.
Since interest accrues on the remaining balance, extra payments made early in a loan (when the
balance is largest) prevent more future interest than the same extra payment made later in the
loan’s term, when less balance and less time remain for interest to compound against.
Confirm extra payments are applied to principal, not held as a payment-ahead credit. Some
lenders default to applying an overpayment toward next month’s payment rather than immediately
reducing the principal balance — check with your specific lender or your account statement to
confirm the extra amount is actually reducing the balance the way this calculator assumes.
A prepayment penalty, if your loan has one, can offset some of the calculated savings.
Prepayment penalties are less common on auto loans than on mortgages, but some loans do include
one — check your loan agreement before committing to a plan of extra payments.
Compare extra loan payments against other uses for the same money. If you’re carrying
higher-interest debt elsewhere (credit cards especially), paying that down first often saves
more in total interest than extra payments toward a lower-rate auto loan — this calculator shows
what the extra payment does for THIS loan specifically, not how it compares to other options.
Useful to Know
This calculator models a recurring extra amount added every month, but the underlying math is
identical for an occasional windfall — a tax refund or work bonus applied as a one-time lump sum
toward the principal saves interest the same way, just concentrated into fewer, larger payments
rather than spread evenly across smaller ones. If the loan’s interest rate is well above what
current auto refinance rates look like, it’s also worth comparing refinancing to a lower rate
against simply making extra payments — refinancing can sometimes save more, especially on an
older loan with a meaningfully higher rate than today’s market.
Cómo Se Calculan los Pagos Extra del Préstamo de Auto
Añadir una cantidad fija extra al pago mensual de un préstamo de auto va directamente hacia el
capital, lo que reduce tanto cuánto interés se acumula en adelante como cuántos pagos quedan.
Ingresa tu saldo de préstamo actual, tasa de interés y plazo restante, más una cantidad extra que
planeas pagar cada mes, y esta calculadora simula el nuevo cronograma de pago para mostrar cuánto
tiempo e interés ahorra ese pago extra.
Esto es distinto de la calculadora Calculadora de Liquidación de Hipoteca, que modela un cambio a un
cronograma de pago quincenal específicamente — esta modela la palanca más simple y común de una
cantidad fija extra añadida a tu pago mensual existente.
La fórmula
Cronograma estándar (sin cambios):
Pago Estaˊndar=Saldo Actual×(1+r)n−1r(1+r)n
Con el pago extra, el préstamo se simula mes a mes a
Nuevo Pago=Pago Estaˊndar+Pago Extra
hasta que el saldo llega a cero, rastreando el número real de meses e interés pagado.
Meses Ahorrados=n−Nuevos Meses de Pago
Ejemplo resuelto
Un saldo de $15,000 al 7% TAE con 36 meses restantes, añadiendo $100 extra cada mes:
Pago Estándar: aproximadamente $463.16/mes, para un interés total estándar de
aproximadamente $1,673.63.
Con los $100/mes extra ($563.16/mes en total), el préstamo se liquida en 30 meses en
lugar de 36 — un ahorro de 6 meses.
Interés total con el pago extra: aproximadamente $1,349.64, un ahorro de aproximadamente
$323.99 comparado con el cronograma estándar.
Factores Clave a Considerar
Los ahorros son mayores, tanto en dólares como en términos porcentuales, más temprano en el
plazo de un préstamo. Como el interés se acumula sobre el saldo restante, los pagos extra
hechos temprano en un préstamo (cuando el saldo es mayor) evitan más interés futuro que el mismo
pago extra hecho más tarde en el plazo del préstamo, cuando queda menos saldo y menos tiempo para
que el interés se acumule.
Confirma que los pagos extra se apliquen al capital, no que se guarden como un crédito de pago
adelantado. Algunos prestamistas aplican por defecto un sobrepago hacia el pago del próximo mes
en lugar de reducir inmediatamente el saldo de capital — verifica con tu prestamista específico o
tu estado de cuenta para confirmar que el monto extra realmente esté reduciendo el saldo de la
forma en que asume esta calculadora.
Una penalidad por pago anticipado, si tu préstamo tiene una, puede compensar parte del ahorro
calculado. Las penalidades por pago anticipado son menos comunes en préstamos de auto que en
hipotecas, pero algunos préstamos sí incluyen una — revisa tu contrato de préstamo antes de
comprometerte a un plan de pagos extra.
Compara los pagos extra al préstamo contra otros usos para el mismo dinero. Si tienes deuda
con una tasa más alta en otro lugar (especialmente tarjetas de crédito), pagarla primero a
menudo ahorra más interés total que los pagos extra hacia un préstamo de auto de tasa más baja —
esta calculadora muestra lo que hace el pago extra para ESTE préstamo específicamente, no cómo se
compara con otras opciones.
Vale la pena saber
Esta calculadora modela una cantidad extra recurrente añadida cada mes, pero las matemáticas
subyacentes son idénticas para un ingreso inesperado ocasional — un reembolso de impuestos o un
bono laboral — aplicado como una suma única hacia el capital ahorra intereses de la misma manera,
solo que concentrado en un pago más grande en lugar de repartido en pagos mensuales más pequeños.
Si la tasa de interés del préstamo está muy por encima de las tasas actuales de refinanciamiento
de autos, también vale la pena comparar refinanciar a una tasa más baja frente a simplemente hacer
pagos extra — refinanciar a veces puede ahorrar más, especialmente en un préstamo antiguo con una
tasa significativamente más alta que la del mercado actual.
How is this different from the Mortgage Payoff Calculator?
Mortgage Payoff models switching to a biweekly payment schedule — paying half your payment every two weeks, which works out to one extra monthly-equivalent payment per year. This calculator instead adds a flat extra amount to your existing monthly payment every month, a simpler and more common way to pay off an auto loan early.
Is there a penalty for paying off a car loan early?
Some auto loans include a prepayment penalty, though it's less common than with mortgages. Check your loan agreement or ask your lender before committing to extra payments, since a penalty could offset some of the interest savings this calculator shows.
Where does my extra payment actually go?
On a standard auto loan, an extra payment amount goes entirely toward reducing your principal balance (assuming it's applied correctly by your lender, not just held as a credit toward next month's payment) — which is exactly why it shrinks both the time remaining and the total interest charged, since interest is calculated on whatever balance remains.
Does it matter when in the loan I start making extra payments?
Yes -- extra payments made earlier in the loan (when the balance is largest) prevent more future interest than the same extra payment made later, since interest is always calculated on the remaining balance. Starting extra payments as early as possible maximizes the total interest saved.
Should I pay extra on my car loan or pay down higher-interest debt first?
If you're carrying higher-interest debt elsewhere, like a credit card, paying that down first typically saves more in total interest than extra payments toward a lower-rate auto loan. This calculator shows what an extra payment does for this specific loan -- compare its interest rate against your other debts before deciding where extra money is best spent.
Does a one-time lump-sum payment work the same way as a monthly extra payment?
Yes -- a lump sum (from a tax refund or bonus, for example) applied toward the principal saves interest through the same mechanism as a recurring extra payment, just concentrated into one larger payment instead of spread across smaller monthly ones. Confirm with your lender that it's applied to principal, the same check that applies to any extra payment.
Could refinancing save more than making extra payments?
It's worth comparing both. If your loan's rate is well above current auto refinance rates, refinancing to a lower rate can sometimes save more in total interest than extra payments at the original rate, especially on an older loan. The two approaches aren't mutually exclusive either -- refinancing to a lower rate and then continuing to make extra payments compounds the savings.
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