Owe more on your car than it's worth? Enter your loan payoff, the trade-in offer and the new deal. You'll see how far upside down you are, the new loan amount and payment, and what rolling the old debt into the new loan really costs.
Last updated:
Your current car
$
Ask your lender for the 10-day payoff, not the statement balance.
$
The dealer's actual offer, not the private-sale value.
New car deal
$
$
$
$
Doc, title and registration fees you finance.
%
True in most US states; untick if yours taxes the full price.
%
% / yr
Used only for the equity timeline; 15% to 20% is common for new cars.
Enter your values to see the result.
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How to use the Car Negative Equity Calculator
Enter your loan payoff and the trade-in value the dealer is offering.
Add the new car deal: price, cash down, rebates, financed fees and your sales tax rate.
Set the new loan rate and term.
Read your negative equity, new loan amount and monthly payment.
Compare the payment without the rollover and check when the new car's value overtakes the balance.
How negative equity on a trade-in works
You have negative equity (you are "upside down") when you owe more on your car loan than the car is worth. At trade-in time the dealer must still pay off your old loan, so the shortfall, payoff − trade-in value, has to come from somewhere: your cash, or more often the new loan.
When it is rolled into the new loan, the amount financed becomes new car price + sales tax + fees − cash down − rebates − trade-in value + old loan payoff. You then pay interest on the old car's leftover debt for the whole new term, and you start the new loan owing more than the new car is worth, which is how many drivers end up upside down again at the next trade.
The monthly payment uses the standard amortization formula P = L × r ÷ (1 − (1 + r)−n), where L is the loan amount, r the monthly rate (APR ÷ 12) and n the number of months. The calculator works it out twice, with and without the rolled-over balance, so you can see exactly what the old debt costs you.
Monthly cost of rolling over negative equity (8.5% APR)
The extra amount added to your payment just for the rolled-over balance:
Negative equity
48 months
60 months
72 months
84 months
Total repaid over 72 mo
$2,000
$49.30 / mo
$41.03 / mo
$35.56 / mo
$31.67 / mo
$2,560
$5,000
$123.24 / mo
$102.58 / mo
$88.89 / mo
$79.18 / mo
$6,400
$8,000
$197.19 / mo
$164.13 / mo
$142.23 / mo
$126.69 / mo
$10,240
$12,000
$295.78 / mo
$246.20 / mo
$213.34 / mo
$190.04 / mo
$15,361
Figures cover only the rolled-over amount. Your full payment also includes the new car, taxes and fees.
Ways to deal with being upside down
Pay the gap in cash if you can. It is the cheapest option because no interest is charged on it.
Keep the car longer and make extra principal payments until the balance falls below its value.
Sell privately. A private sale often brings more than a trade-in offer, which shrinks the gap.
Choose a cheaper car or a shorter term if you must roll it over, so the new loan catches up with the car's value sooner.
Look at GAP insurance. If the new car is totaled while you are upside down, regular insurance pays only its market value. GAP coverage pays the difference.
Get your payoff in writing and make sure the dealer actually pays the old loan off after the trade.
Frequently asked questions
What is negative equity on a car?
Negative equity means you owe more on your auto loan than the car is worth. If your payoff is $21,500 and the dealer offers $16,000 for your trade-in, you have $5,500 of negative equity, also called being upside down or underwater.
Can I roll negative equity into a new car loan?
Usually yes. The dealer pays off your old loan and adds the shortfall to the new loan. You will then pay interest on that old debt for the whole new term, and you start the new loan owing more than the new car is worth.
How much does rolling over negative equity add to my payment?
Roughly the payment on the rolled-over amount alone. At 8.5% APR, each $5,000 of negative equity adds about $89 a month over 72 months, or about $103 a month over 60 months, plus extra interest on top of the original debt.
How much negative equity will a lender allow?
It depends on the lender and your credit. Many cap the loan at about 120% to 125% of the car's value, including taxes and fees. The calculator shows your loan-to-value so you can see if a deal is likely to be approved.
Does a trade-in reduce sales tax when I'm upside down?
In most US states sales tax is charged on the price minus the trade-in value, and that credit applies even when you still owe money on the trade. A few states tax the full price, so untick the trade-in tax option if yours does.
What is the best way to get out of an upside-down car loan?
The cheapest way is to keep the car and pay extra principal, or pay the gap in cash when you trade. Selling privately can also narrow the gap. If you must roll it over, a cheaper car and a shorter term help you get back to positive equity sooner.
How do I find my car loan payoff amount?
Ask your lender for a payoff quote, usually good for 10 days. It includes interest that has built up since your last payment, so it is a bit higher than the balance on your statement.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.