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Car Affordability Calculator Guide
Dealers work out what you can be sold, not what you can afford. This car affordability calculator starts from your income and works backwards to a sensible price, using the widely cited 20/4/10 rule.
The 20/4/10 rule: 20% down, a loan no longer than 4 years, and total car costs under 10% of gross income. The affordable price is your maximum loan plus your down payment.
How Much Car Can I Afford?
On $5,000 a month gross, 10% gives a $500 monthly payment. Over 4 years at 7% APR that supports a loan of about $20,880 — so with $4,000 down you're looking at a car around $24,880. Stretching the term to 7 years buys a more expensive car and costs far more in interest.
Why the Loan Term Matters So Much
Long loans are how a payment you can afford becomes a car you can't. Six and seven-year terms lower the monthly figure but you pay much more interest and spend years owing more than the car is worth — negative equity that follows you into your next purchase. Four years is the sensible ceiling.
The 10% Isn't Just the Payment
The rule's 10% is meant to cover total transport cost — insurance, fuel, tax, and maintenance included, not just the loan. If your payment alone eats the full 10%, you're already over. Insurance on a newer or sportier car can add a lot, so get a quote before you commit rather than after.
Down Payment Protects You
Twenty percent down matters because new cars lose value fastest in year one. Going in with real equity keeps you from being underwater the moment you drive away, and it lowers both your payment and your total interest.
These results are estimates for education and planning, not financial advice. Actual returns, rates, and terms vary — check with a qualified professional before making decisions.
Related: Car Payment Calculator, Auto Lease Calculator, and DTI Calculator.
Frequently Asked Questions
How much car can I afford on my salary?
A common guideline is the 20/4/10 rule: 20% down, a maximum 4-year loan, and total car costs under 10% of your gross income.
What is the 20/4/10 rule?
Put 20% down, borrow for no more than 4 years, and keep all car costs — payment, insurance, fuel, maintenance — under 10% of gross income.
Is a 72-month car loan a bad idea?
It lowers the monthly payment but costs much more interest and leaves you owing more than the car is worth for years, which is a common way to end up in negative equity.
Does the 10% include insurance and fuel?
Yes. The 10% is meant to cover total transport costs, so if the loan payment alone uses all of it, the car is above your budget.
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