Why DealProof exists
Vehicle negotiations often return to one question: “What monthly payment do you want?” A payment alone does not reveal the selling price, loan length, total interest, trade shortfall, or products inside the loan. DealProof keeps those numbers visible.
What it is
A free educational calculator and buyer toolkit for comparing written figures before a vehicle purchase. The tools run in your browser and require no account.
What it is not
DealProof is not a dealership, lender, broker, insurer, credit counselor, tax adviser, or law firm. It does not make financing offers, pull credit, value a vehicle, or replace official transaction documents.
How these guides are made
DealProof uses AI assistance to develop its tools and educational explanations. Worked examples are created for this site and labeled as hypothetical; they are not customer case studies or dealer offers. Numerical examples use the published formulas. Links to government sources let readers check the underlying consumer guidance and state rules.
A calculation check is not professional financial or tax review. Tax presets cannot cover every transaction, and the site does not claim to verify a vehicle's market price or a lender's approval.
How it stays transparent
The formulas and assumptions are published on the methodology page. Calculator results stay separate from advertising and partner compensation.