Vehicle EconomicsDown Payment Needed for Target Payment
Solve the exact cash down payment this specific deal requires to hit your target payment.
Why this comes up
You've picked a car and know your target payment, but you don't know how much cash you actually need to put down to hit it. Fees, taxes, and any negative trade equity all eat into your borrowing capacity before the down payment even enters the picture, so the answer isn't just "sticker price minus loan amount."
How we calculated this
We solve the financed principal your target payment supports, then compare it against the deal amount after any trade. Whatever's left over is the required cash down payment.
Worked example, using this page's own defaults ($30,000 deal, no trade, 6% APR, 60 months, $400 target payment): the required down payment comes to a few thousand dollars, run the calculator above for the exact figure against your own deal.
What this means
- If the required down payment is negative equity, that means fees or a shortfall are consuming borrowing capacity, not that you're owed cash back.
- A cash gap here means the deal isn't achievable at this target payment without more cash, either raise the payment target or check Maximum Car Price From Monthly Budget for a price that fits your actual cash.
- Negative trade equity increases the required down payment directly, see Down Payment Needed to Eliminate Negative Equity if that's the real driver.
Limitations
No taxes are inferred beyond what's included in "deal amount." See Methodology.
Methodology
This engine combines Vehicle Economics' fixed-rate amortization model (the standard loan-payment formula run out as a full month-by-month schedule) and break-even search model (a closed-form solve where one exists, otherwise a bounded search over a stated plausible range). See Methodology for the full detail.