Car Loan Early Payoff
Two answers on one page. What paying a little extra every month takes off the loan, and the month the balance finally falls below what the car is worth — because for much of a long term it does not, and selling the car would leave a debt behind. The rate the car loses value at is yours to supply; nothing about a car’s value is assumed here.
On top of the scheduled payment, applied to the principal.
Your own figure for this model. Clear it to assume it holds its value, which no car does.
What the extra payment removes
$1,145 of interest
Paid off in 3 yr 10 mo instead of 5 years — 1 yr 2 mo sooner.
- Scheduled payment$383.13
- Paying the schedule only$4,488 interest over 5 years
- Paying $100 more a month$3,343 interest over 3 yr 10 mo
When the car is finally worth more than the loan
Month 14
Until then — 1 yr 2 mo of the term — the car is worth less than the debt secured on it, and selling would leave a shortfall to settle in cash.
The extra payment brings that moment forward by 1 year, from month 26.
- After 1 yearowes $14,175 · worth $13,760 · $415 short
- After 2 yearsowes $9,450 · worth $11,834 · $2,384 in hand
- After 3 yearsowes $4,286 · worth $10,177 · $5,891 in hand
How this was worked out
- What the loan schedules$18,500 at 8.9% over 5 years = $383.13 a month
- Left alone60 payments, $4,488 of interest
- With the extra on top$383.13 + $100 = $483.13 a month, 46 payments, $3,343 of interest
- The difference between them$1,145 of interest and 1 yr 2 mo off the term
- Where the two lines crossThe car starts at $16,000 and loses 14% a year on the declining balance, so the balance drops below the car's value in month 14.
The rate of decline above is the one this page loads with, not a figure for your car. It is there so the crossing month is a real answer on arrival rather than a blank. Price the same model a year or two older on a listings site and replace it before you rely on the month.
The gap between what a car is worth and what is owed on it is the thing GAP insurance is sold against, and it is almost never mentioned in the conversation where somebody agrees to a six or seven year term. Stretching a term lowers the payment and lengthens exactly this period. That is the trade being made, and it is rarely stated out loud.
Overpayments here are assumed to reduce the principal on the day they are made. Some agreements apply them to the next instalment instead, which means paying early rather than paying down and saves no interest at all. Check the wording, and check for an early settlement charge, before committing to a plan built on this page.
The car’s value falls smoothly here at one rate, all the way to the last payment. Real values fall in steps and fastest at the start, so the crossing month is a guide rather than a date. Nothing above counts what the loan is secured against beyond the car itself, and a balloon payment at the end of an agreement is not modelled — a term that ends with a large lump sum owed is a different shape from the one being walked here.
The month nobody mentions before you sign
A vehicle loses value fastest during exactly the years a long agreement pays down slowest. Put the two lines on the same axis and they cross, and on a six or seven year term the crossing arrives a very long way in. Until it does, selling the car would not clear what is owed on it — the sale would leave a debt with nothing attached to it, to be settled in cash.
That gap has a name at the dealership, because it is what shortfall cover is sold against. It has no name at all in the conversation where somebody agrees to stretch a term to bring the instalment down. This page reports the month it closes, which is the number that should be on the desk before a signature goes anywhere near the paperwork.
What overpaying actually buys
Take 18,500 outstanding at 8.9% with five years to run. The scheduled instalment is 383.13 and the agreement costs 4,487.94 in interest if left alone. Add 100 a month and it finishes in 46 months instead of 60, with interest of 3,342.80 — a saving of 1,145.14 and fourteen months returned.
The saving compounds backwards. Every unit paid early stops accruing from that moment, so the earliest overpayments are worth far more than the last ones. This is also why holding money back for a year and paying a single lump sum is the weaker move: the balance carried that interest for the whole twelve months first.
Where the two lines cross
Using the same balance against a car worth 16,000 falling at 14% a year, the debt overtakes the value at month 26 on the scheduled payments. The extra 100 a month brings that forward to month 14 — twelve months less exposure, which for many people matters more than the interest saved, because it is twelve fewer months during which a write-off or a change of circumstances turns into a bill.
Leave the decline field empty and the car is treated as holding its value perfectly, which no car does. The month that comes back will be far too optimistic. Enter a real figure, even a rough one built from listings for the same model a year or two older, and watch how far the answer moves.
Two things to check with the lender first
Whether overpayments reduce the balance on the day they arrive. Some agreements credit them against the next instalment instead, which means paying early rather than paying down, and saves nothing whatsoever in interest. The wording matters more than the assurance given over the phone, so get it confirmed in writing before building a plan on any of these figures.
And whether settling early carries a charge. Regulated consumer agreements in many places permit a fee calculated from the remaining term, which eats into the saving shown here and occasionally erases it on a short balance. Neither is modelled on this page, because both are specific to a contract that only you are holding.
Overpayments, lump sums and negative equity
Is being underwater on a car loan actually a problem?
Only when something forces the issue. Keep the vehicle, keep paying, and the position closes on its own. It bites when a car is written off and the insurer pays market value rather than the balance, or when a job move or a growing family makes selling necessary earlier than planned.
Why does a longer term make the gap so much worse?
Because the two effects stack. A stretched agreement retires principal more slowly in its early years while the value falls at the same speed it always would, so the lines separate further and stay apart longer. The lower instalment is bought precisely with that exposure.
Should I clear this or put the money into savings?
Compare the borrowing rate against what the money would earn after tax somewhere else. Clearing debt at 8.9% is a guaranteed 8.9% return and very little else guarantees anything. The exception is an emergency fund, which is worth holding even at a poor rate because it is what stops the next surprise becoming more borrowing.
Does a lump sum work as well as monthly overpayments?
It works, and the page will show the effect if you convert it to an equivalent monthly amount, but timing changes the answer. A single payment made today removes interest from today onward, whereas the same sum dripped out across a year lets part of the balance keep accruing in the meantime.