How Much Car Can I Afford? The Honest Answer for 2026

The average new-car loan in 2026 is $42,000 at 7.4% APR over 69 months. The average monthly payment is $738. And the average buyer leaves the lot stretched too thin. The dealer's question — 'what payment can you afford?' — is not the same question you should be asking yourself.

The wrong way to figure it out

Most people back into a car decision from one number: the monthly payment. The dealer extends the loan term until the payment fits, the interest balloons, and the buyer ends up underwater on a car that's losing value faster than the loan is shrinking. The payment looks affordable. The car isn't.

The right way: three checks, in order

A car you can actually afford passes all three of these. If it only passes one or two, you're stretching — and the second-order costs (postponed retirement contributions, no emergency fund cushion, no flexibility to switch jobs) will catch up.

Check 1: The 20/4/10 rule

Put 20% down, finance for 4 years or less, and keep total monthly auto costs (payment + insurance + fuel + maintenance) under 10% of your gross monthly income. This is the oldest rule of thumb for a reason — it has held up across decades because it leaves room for the rest of life.

Check 2: Payment under 10% of take-home

Your loan payment alone, before insurance and fuel, should sit under 10% of monthly take-home. At a $5,800/mo take-home, that's $580 max. This is the constraint that protects your monthly cash flow.

Check 3: Total DTI under 36%

Add your existing monthly debt payments to the new car payment and divide by gross monthly income. If the result tops 36%, lenders will still approve you — they care about getting paid, not about your retirement. You should care about both.

Worked example

Someone earning $7,500/mo gross, $5,800/mo take-home, with $350/mo of existing debt, can afford a loan payment of about $400–$580 (the lower of the two limits applies). At 7.5% APR over 60 months that's a $20,000–$29,000 loan. With a 20% down payment, that points to a vehicle price of around $25,000–$36,000 — closer to the low end if you want to comfortably also save for retirement and emergencies.

What the dealer won't tell you

Stretching the loan term to 72 or 84 months drops the payment by 15–25% but increases total interest paid by 40–80% and almost guarantees you'll be underwater. The lower payment buys you nothing real. Skip the long-term loan unless you absolutely have to.

Run your exact numbers

Plug your income, existing debts, and the vehicle you're considering into the Car Affordability Calculator. It runs all three checks at once and reverse-solves the max vehicle price your income supports.