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Disclaimer
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 This Calculator Works
When a dealer offers a choice between a cash rebate at the standard rate or a low promotional
rate at full price, which one actually costs less depends on the size of the rebate, the gap
between the two rates, and the loan term — not something obvious just by looking at the two
numbers. Enter the vehicle price, the rebate amount, both interest rates, and the loan term, and
this calculator compares the total cost of each path.
A cash rebate doesn’t cost you anything directly — it simply reduces how much you need to
finance. So the fair way to compare the two options is the total amount actually paid over the
life of the loan: a smaller loan at a higher rate versus a larger loan at a lower rate.
The Formula
Both options use the same standard fixed-rate amortization formula, just with different
principal and rate:
Cash back path: (Vehicle Price−Rebate) financed at
the standard rate.
Low interest path: the full Vehicle Price financed at the promotional rate.
Whichever path produces the lower Monthly Payment×Number of Payments
total is the better deal.
Worked Example
A $30,000 vehicle with a $2,000 rebate, a 6% standard rate or a 1.9% promotional
rate, over a 60-month term:
Low interest: financing the full $30,000 at 1.9% → $524.52/month, ≈ $31,471 total.
Low interest wins in this case, saving about $1,008 over the life of the loan — the
rate gap (6% vs. 1.9%) outweighs the $2,000 rebate.
Cómo funciona esta calculadora
Cuando un concesionario ofrece elegir entre un reembolso en efectivo a la tasa estándar o una
tasa promocional baja al precio completo, cuál de las dos opciones cuesta realmente menos depende
del tamaño del reembolso, la diferencia entre ambas tasas y el plazo del préstamo — algo que no
resulta obvio con solo mirar los dos números. Ingresa el precio del vehículo, el monto del
reembolso, ambas tasas de interés y el plazo del préstamo, y esta calculadora compara el costo
total de cada opción.
Un reembolso en efectivo no te cuesta nada directamente — simplemente reduce cuánto necesitas
financiar. Así que la forma justa de comparar ambas opciones es el monto total realmente pagado a
lo largo de la vida del préstamo: un préstamo más pequeño a una tasa más alta frente a un préstamo
más grande a una tasa más baja.
La fórmula
Ambas opciones usan la misma fórmula estándar de amortización a tasa fija, solo que con un capital
y una tasa diferentes:
Opción de reembolso en efectivo: (Precio del vehıˊculo−Reembolso)
financiado a la tasa estándar.
Opción de tasa baja: el precio completo Precio del vehıˊculo financiado a la
tasa promocional.
La opción que produzca el total más bajo de
pago mensual×nuˊmero de pagos es la mejor oferta.
Ejemplo resuelto
Un vehículo de $30,000 con un reembolso de $2,000, una tasa estándar del 6% o una tasa
promocional del 1.9%, a un plazo de 60 meses:
Reembolso en efectivo: financiando $28,000 al 6% → $541.32/mes, ≈ $32,479 en total.
Tasa baja: financiando el total de $30,000 al 1.9% → $524.52/mes, ≈ $31,471 en total.
La tasa baja gana en este caso, ahorrando cerca de $1,008 a lo largo de la vida del
préstamo — la diferencia entre tasas (6% frente a 1.9%) supera al reembolso de $2,000.
Why would the low-interest option ever NOT be the better deal?
Because a promotional rate only saves money proportional to how much interest it avoids — on a short loan term or a modest rate gap, that savings can be smaller than a straightforward cash rebate taken off the price. The rebate amount, rate gap, and loan term all interact, which is exactly why it's worth calculating rather than assuming the flashier 0%-style offer automatically wins.
Can I negotiate the rebate and the low rate at the same time?
Almost never — these are typically manufacturer-subsidized incentives structured as an either/or choice specifically so the manufacturer doesn't have to offer both simultaneously. Some dealers may have room to negotiate the vehicle price itself on top of either option, which is a separate negotiation from choosing between the two financing paths.
Does a longer loan term change which option wins?
Yes — a longer term means more months for the rate difference to compound, which tends to widen the gap between the two options (in whichever direction the lower rate already favored). Recalculate with your actual loan term rather than assuming the same answer holds at a different term length.
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