How it works
The underlying illustrative valuation starts with an 18% decline in the first year and 12% in each later year. At age zero it retains the starting MSRP. Expected mileage is 12,000 miles per year, with an adjustment of 0.0002% per mile above or below that benchmark, capped at ±20%. Kilometers are converted before that adjustment.
Good condition and base trim have a 1.00 multiplier. Excellent, fair, and poor conditions use 1.05, 0.85, and 0.65. Mid and premium trim use 1.05 and 1.10. The trade midpoint is 85% of the private midpoint. Every coefficient is an illustrative modeling choice, not a measured dealer discount or a licensed valuation.
The formula behind the estimate
Every result starts with a defined model and visible assumptions.
Private midpoint = age-depreciated original base MSRP × mileage × condition × trim adjustments Trade midpoint = private midpoint × 0.85 Trade scenario band = midpoint × [0.85, 1.15] Net trade equity = estimated trade value − current loan payoff
A worked example
For a five-year-old car with $30,000 original base MSRP, 60,000 miles, good condition, and base trim, the modeled trade midpoint is about $12,540. With an $8,000 payoff, midpoint equity is about $4,540. If a real dealer offer is $11,000, that actual offer replaces the modeled amount in your purchase budget.
The trade allowance is only one line in the deal
A generous-looking allowance can be offset by a higher replacement-car price, added products, or less favorable financing. Compare complete written deals on the same vehicle and assumptions. Record the vehicle price before trade, taxes and fees, the trade allowance, payoff, cash down, amount financed, rate, and term. A combined monthly-payment discussion makes those tradeoffs harder to see.
The range displayed here is ±15% around a generic midpoint. It is not a promise that a dealer will buy within that band. Reconditioning needs, title history, local inventory, demand, and the specific model may dominate the calculation. A dealer’s inspection and actual written offer provide evidence this tool does not have.
Plan for positive or negative equity
Positive equity means the offer exceeds the payoff, leaving value that may contribute toward the next purchase. Negative equity means the old debt is larger than the offer. Rolling that difference into a new loan increases the new principal; it does not make the old debt disappear. You can model that amount directly in the loan calculator.
A private sale may produce more gross proceeds but require preparation, advertising, appointments, secure payment, and lien-release coordination. Compare net proceeds and effort, not just the highest asking price you saw online. Before handing over keys or title, verify the transfer process with your lender and state motor-vehicle agency. Keep confirmation that the previous loan was paid.
Questions worth asking
Is this a guaranteed cash offer?
No. There is no dealer network or live offer integration. This is a disclosed planning model for a broad range and possible equity.
Why is trade-in below private sale?
The model applies an illustrative 15% channel reduction. It represents a scenario, not a factual fixed margin for every dealer or vehicle.
Can a trade increase my next loan?
Yes. If payoff exceeds the trade allowance, the difference must be paid or financed. The loan calculator can show its effect on payment and interest.
Does the estimate include a tax saving?
No. Tax treatment depends on the transaction and jurisdiction. Enter only a verified allowed credit in the separate tax calculator.
What should I use as the payoff amount?
Use a lender payoff quote valid for the expected transaction date. A statement balance may not include all accrued interest or applicable charges.
This is general information, not personalized financial advice. Read the limitations.
