Car Affordability Calculator
The short answer: a car is affordable when its total monthly cost — payment, insurance, fuel, maintenance — stays near 15% of your take-home pay. Enter your income and running costs and this tool returns your payment budget, the biggest loan that budget honestly supports, and the top of a sane price range once your down payment is added. It's a guardrail, not a permission slip.
Get pre-approved at your number
A pre-approval at or below this budget makes the guardrail real — show sellers a rate, not a hope. LendingTree's auto loan marketplace (application via CJ) is the planned partner for this slot.
How this is calculated
The payment budget is 15% of your monthly take-home pay, minus the running costs you entered (insurance, fuel, maintenance — the costs that exist whether or not there's a loan). The maximum loan is the present value of that payment budget at your APR and term: the loan whose amortization payment exactly equals the budget. Add your down payment and you get the top of the price range. Every step uses the same standard formulas as our loan calculator, run in reverse.
The honesty part: rules of thumb are blunt. If your rent is low and you have no other debt, you might comfortably run above 15%; with high housing costs or other payments, even 15% can be too much. And it says nothing about whether buying a car at all beats keeping your current one — the cost-per-mile calculator helps with that comparison.
Frequently asked questions
What is the 15% rule for car affordability?
A common budgeting guardrail: keep your total car costs — loan payment plus insurance, fuel, and maintenance — at or under about 15% of your monthly take-home pay. This calculator reserves your estimated running costs first, then works out what payment (and therefore what loan and price) fits in what remains.
Why will a lender approve me for more than this?
Because a lender's question is "will this loan be repaid," not "will this loan leave your budget healthy." Approval limits are set by default risk across thousands of borrowers; your affordability limit is set by your rent, your savings goals, and your life. The stricter of the two numbers is the one to obey — and it's usually this one.
Should my down payment come from my emergency fund?
No. A down payment shrinks the loan, but an emptied emergency fund turns the first repair or bad month into credit-card debt at far worse rates. Keep the reserve intact and treat "the price range drops" as the honest consequence — or wait and save the down payment separately.
Does a longer term make a car more affordable?
It makes the payment smaller, not the car cheaper — total interest rises and you stay underwater longer. This calculator lets you test terms, but a price that only fits at 72+ months is usually a price that doesn't fit.