Interest Rate
Term (Months)
Monthly Payment
(% of pay after living expenses
Monthly Payment ($)
Total Loan
Down Payment
An effective and commonly employed rule of thumb for buying a car is to limit your monthly payments to 10% of your annual salary, this places an effective constraint on the total amount you can spend on a car such that you can comfortably afford your monthly payments.
However, this fails to account for other key expenses, such as rent, mortgage or personal debt payments
This calculator shows the maximum you can afford to pay for a car (based on this core 10% rule), after adjusting for these other key monthly expenses
The 4 / 10 / 20 rule
Aaron graduated with a degree in accounting from San Diego State University. He's since been working for SellMax calculating the value of used cars. Aaron commonly sees individuals making the same mistakes when buying a car. This guide is his response in hopes to better the financial situation of the general public.