Negative Equity (Upside Down) Calculator

Negative equity is the gap between the payoff on your current car loan and what a dealer will allow for the car. That gap does not disappear at trade-in. Unless you pay it in cash, it is added to the new loan, so you start out borrowing for two cars: the one you are buying and the unpaid part of the one you are leaving. The CFPB warns that rolling the old balance over can increase your total loan costs, and suggests getting the payoff amount and trade value first so you can compare paying off, waiting, or rolling over (checked October 2026).

This page uses the trade value and amount owed fields of the main auto loan calculator, with presets built around one $5,000 shortfall. Its job is to put a price on that shortfall: how much it adds to the payment, how much interest it collects, and how many extra months the new loan stays above the car's value. For trades with positive equity and the tax credit in detail, the trade-in loan calculator is the better starting point.

The underwater column uses an assumed value path for the new car (down 18 percent in the first year, then 12 percent a year). It is an illustration, not a forecast for any model.

Paying the shortfall in cash is the cleanest option: compared with rolling it into a 60-month loan, the borrower pays $5,000 now but $1,068.57 less over the life of the deal, and the loan catches up with the car about six months sooner. The cheaper car keeps the payment lowest, but because the shortfall is a bigger share of a smaller loan, its starting loan-to-value is 129.4 percent and it still spends nearly three years underwater. The 72-month roll-in carries the most interest and the longest underwater stretch of the four.

Every payment you make on the current loan shrinks the shortfall from one side, while the car's value usually declines more slowly as it ages. Keeping the car for another year or two, and adding extra principal where the budget allows, is often the cheapest way out because it uses the old loan's rate rather than adding the gap to a new one. Get a fresh payoff quote and trade valuation every few months; when the gap closes, the trade becomes a down payment instead of a debt.

If you do roll the balance over, the CFPB suggests confirming with your old lender roughly a week later that the loan was paid off, and checking that any dealer promise to cover your negative equity is not simply added to the new financing (checked October 2026).

1. Using the statement balance instead of a payoff quote. Interest accrues daily, so the payoff is usually a bit higher. Use the payoff figure in the amount owed field.
2. Hearing "we will pay off your trade" as a gift. The dealer pays your old lender, but the shortfall usually lands in your new loan amount. Look for it on the contract.
3. Fixing a big balance with a long term. Stretching to 72 or 84 months adds interest and keeps you underwater longer, which sets up the same problem at the next trade. See the 72-month auto loan calculator.
4. Rolling in a second time. A shortfall carried through two trades can leave a loan far above the value of the car. Break the cycle by paying it down or waiting.
5. Skipping gap coverage questions. With a loan-to-value above 100 percent, a total loss could leave a balance after the insurance payout. Ask your insurer and lender how that gap would be handled before you sign.

Ask in order: does the current car still meet your needs safely and reliably? If yes, waiting is usually cheapest. If you must replace it, can you pay the shortfall from savings without emptying your emergency fund? If yes, pay it and finance only the new car. If not, roll it in, but choose a less expensive car and the shortest term the budget can carry, and put the true cost of the shortfall (the gap plus its interest) next to the payment when you decide. Check that the payment fits with the how much car can you afford guide before visiting a dealer.

• CFPB, Should I trade in my car if it is not paid off? (checked October 2026).