Vehicle Economics

Car Affordability Calculator

Most affordability tools stop at the loan payment. This one subtracts operating costs first, so the price you see is what you can actually sustain.

Why this comes up

A lender will happily approve a payment that eats your whole transportation budget, because "affordable" to a lender means "you can service the debt," not "this leaves room for gas, insurance, and repairs." Most affordability calculators repeat the lender's framing: payment as a percent of income. This one starts there, then subtracts what operating the vehicle actually costs, so the price you see is one you can sustain, not just qualify for.

How we calculated this

We take your payment-to-income ratio budget, subtract estimated monthly fuel, insurance, and maintenance, and reverse-solve the vehicle price the remaining true payment capacity supports at your APR and term.

Worked example, using this page's own defaults ($6,000/month income, 15% ratio, $260 in combined operating costs): the payment-only budget is $900/month, but the true capacity after operating costs is closer to $760/month, run the calculator above to see the exact gap and resulting price.

What this means

  • The gap between the payment-only budget and true capacity grows with your commute and the vehicle's fuel efficiency, a longer commute or lower MPG shrinks how much car you can actually afford.
  • Once you have a true affordable price, Maximum Car Price From Monthly Budget can help you translate a specific target payment back into a price at different APR/term combinations.
  • This does not include taxes or dealer fees, see Payment From Out-the-Door Price once you have a real quote to check the all-in number.

Limitations

Fuel, insurance, and maintenance are your own estimates, not a quote. This does not know your other debts or spending, it only reflects the ratio and operating costs you entered. 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), ownership total cost model (every ownership cost, depreciation, financing, fuel, insurance, maintenance, repairs, and fees, summed over your horizon), and fuel and charging cost model (your own miles, MPG or kWh, and rates converted directly to a dollar cost). See Methodology for the full detail.

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