How this calculator works
- Monthly car budget = yearly income ÷ 12 × the share you choose.
- Payment budget = car budget − insurance, gas and upkeep.
- Car price = the highest price whose monthly payment fits the payment budget, after your down payment, trade-in, sales tax and fees.
Pick your state and the calculator applies its tax rules. For example, in some states a trade-in lowers the sales tax and in others it doesn't, which changes how much car the same budget buys.
The 20/4/10 rule
A common guideline for buying a car without straining your budget:
- 20% down, so you don't owe more than the car is worth as soon as you drive off.
- 4 years or less on the loan, to limit interest and how long you're making payments.
- 10% of gross income or less for all car costs, including insurance and fuel.
The check next to your results shows which parts your scenario meets. It's a guideline, not a rule. A lender may approve you for much more, but what a lender will approve and what fits your budget comfortably are different numbers.
Choosing your budget share
10% is the conservative choice and leaves room for savings and surprises. 15% can work if you have no other debt and low housing costs. At 20%, the car is taking a large slice of your income, so look hard at a cheaper car or a bigger down payment first.
Next steps
- Get a rate quote from a bank or credit union before you shop, so the APR here is real.
- Price the specific car in the auto loan calculator, with your state's rules filled in.
- Already have a loan? See if a lower rate would help with the refinance calculator.