The car payment lies.
Sticker payment is roughly half the real number. See your true monthly cost — payment + insurance + fuel + maintenance + depreciation — and how much less the same car costs 3 years old.
Sticker payment is just the loan installment. The full bar is what hits your bank account + depreciation (the paper loss you eat when you sell).
The IRR-optimal version of any car is almost always 2-3 years old. You skip the steepest depreciation, lower-rate loans on lower principal, often-similar insurance, slightly higher maintenance — for substantial savings.
What "true cost" actually means.
Most people anchor on the monthly loan payment when they buy a car. That's the wrong anchor. The sticker payment is roughly 40-50% of what the car actually costs you each month. The other half is insurance, fuel, maintenance, and — by far the biggest hidden line — depreciation.
Depreciation is the silent killer. A $40K new car loses ~$8K of value in year 1 (20%), then ~15% of its remaining value each year after that. By year 5, that car is worth ~$17K. You paid $40K. The $23K gap is real money — it just doesn't show up on a monthly bank statement, so most people forget to count it.
Why used wins. Buying a 3-year-old version of the same car skips the steepest depreciation curve. The previous owner ate that 40% loss; you pay a lower price for the same utility, finance a smaller loan, and your annual depreciation in dollars is dramatically lower. Insurance is often slightly cheaper (lower replacement value). Maintenance is slightly higher (out of warranty). Net: you typically save $300-500/mo in true cost for the same transportation.
This calculator doesn't include registration + title fees (~$200-800/yr depending on state), parking (huge in cities), parking tickets, repairs after the warranty expires, or interest you'd earn on the down payment if invested. All of these tilt the math further toward "used + held longer" being the optimal answer.
The framing. This isn't "don't buy a car." Cars are utility. The framing is: buy the IRR-optimal version. That's almost always the 2-3 year-old used version of the car you want, held for 7-10 years. Stick to the math and you free up hundreds a month for investing — which is what the bottom three insight cards on this page show you.