Determine the maximum car price you can afford based on your monthly income, desired payment percentage, down payment, and loan terms. Includes total ownership costs like insurance and fuel.
Car affordability is the most-violated rule in U.S. personal finance. The 20/4/10 rule — 20% down, 4-year loan, total transportation costs (payment + insurance + fuel + maintenance) under 10% of gross income — is the planner's gold standard. The average actual U.S. car loan in 2024 was 68 months on a vehicle that lost value before the loan was halfway paid off, and many households spent 15–20% of gross income on transportation.
This calculator inverts the auto-loan math: given your income and what percentage you're comfortable spending, it tells you the maximum total vehicle price you can buy. It factors in down payment, trade-in, sales tax, the loan term, and ongoing costs (insurance, fuel) so the recommended price reflects what you can actually sustain — not just the loan payment you can technically be approved for.
The result is a ceiling, not a target. Buying right at your maximum leaves no margin for the inevitable surprises: registration, maintenance, an unexpectedly high insurance quote, or a rate that came in worse than expected.
Gross monthly income: $5,500 ($66K/yr — close to U.S. median) Allocation: 10% Down payment: $4,000 60-month loan at 6.5%, 7% sales tax Insurance: $150/mo, fuel: $180/mo Max monthly payment: $550 After insurance + fuel: $220 for P&I Max vehicle price: ≈ $15,000 A reliable 2–3 year old used compact or commuter sedan fits this budget. New cars at the same price point are rare.
Same income, but allow 20% allocation (close to lender max). Max monthly payment: $1,100 After insurance + fuel: $770 for P&I Max vehicle price: ≈ $43,000 The lender will approve this loan. Affordable doesn't mean wise — 20% of gross to transportation crowds out retirement saving, emergency fund building, and reasonable housing costs. The math works on paper; the financial life rarely does.
Use this before walking into a dealership. The single highest-leverage move in car buying is to set your maximum BEFORE you start emotionally attaching to a vehicle. Once you've test-driven a car you love, the cognitive bias is strong — the price you "can afford" tends to creep upward to match what you want.
A few realistic guardrails: - Total transportation: <15% of gross income (10% is comfortable, 20% is stressful) - Loan term: ≤60 months. Beyond that, you'll likely owe more than the car is worth for the first 3+ years - Down payment: ≥20% on a new car or 10% on a used car prevents being upside-down
For the actual loan payment math on a specific vehicle, use the auto loan calculator. For lease-vs-buy comparisons, the lease-vs-buy calculator. For total ownership costs over time, see the car depreciation and fuel cost calculators.
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Experts recommend 10-15% max
Max Vehicle Price
$26,686
Max Monthly Payment
$500
Total Monthly Ownership
$800
Total Interest
$4,446