The 20/4/10 rule
Put at least 20% down, finance for no more than 4 years, and keep total car costs (payment, insurance, fuel) under 10% of gross income.
FAQ
How much car can I afford on $70,000?
About $17,400 with $250 a month for insurance and fuel and a 7% loan.
Sources (checked Nov 6, 2026): Common personal-finance guideline.