How to compare two car offers
Comparing two dealer offers is only hard because dealers make it hard. Break every deal into five lines and the answer is obvious in about a minute.
Break each offer into five lines
1. Selling price of the car (before any fees).
2. All non-negotiable fees (state tax, registration, title).
3. Dealer fees and add-ons (doc fee, protection packages, market adjustment, accessories).
4. Financing: APR, term, monthly payment, total interest over the loan.
5. Trade-in value (if any).
Every offer maps to these five lines. If a dealer won't give you the numbers for each, that's your answer.
Compare the out-the-door price first
OTD = lines 1 + 2 + 3. Whichever is lower is the cheaper car, full stop. A $500 lower selling price with a $1,200 higher doc fee and $800 in add-ons is not the cheaper deal.
Then compare financing separately
Only after OTDs are matched, compare the financing. Look at total interest paid over the life of the loan, not the monthly payment. A 0.5% APR difference on a five-year, $40,000 loan is about $550 — often bigger than the OTD gap.
Then trade-in
Trade-in offer is the last variable. Get it in writing from each dealer as a separate quote — never as 'trade allowance' baked into the deal. A $2,000 difference in trade valuation swings the whole comparison.
Add the numbers up
Total cost = OTD + total interest − trade-in value. That's the number you compare. Everything else is noise.
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