The Monthly Payment Trap
Car salespeople love to ask "what monthly payment works for you?" It's a trap. Focusing on monthly payments obscures the total cost.
The 20/4/10 Rule
- 20% down: protects you from being underwater immediately
- 4-year term: if you need 60 or 72 months to afford the payment, the car is too expensive
- 10% of income: total car expenses (payment, insurance, fuel, maintenance) shouldn't exceed 10% of gross monthly income
Example
$60K income = $5,000/month gross. 10% = $500 for car expenses. Subtract $120 insurance, $80 fuel, $50 maintenance = $250 left for payment. With 20% down and 48-month loan at 6.5%: roughly a $14,000 car.
Reality Check
The rule is conservative. A realistic approach might be 20/5/15 (20% down, 5-year term, 15% of income). The key: calculate total cost, not monthly payment. A $400 payment on 72 months costs $28,800 total. $500 on 48 months costs $24,000. Which is more affordable?