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This hub covers the money decisions around buying a car: what it actually costs to own one, how a car loan is priced, and how a lease payment is really built. Dealers and valuation sites hand you a number and expect you to trust it. We show the arithmetic behind that number instead, with free calculators that do the math in front of you.
The real cost of a car isn't the sticker price or the monthly payment
A car's true cost is everything you spend on it over the years you own it: depreciation (the value it loses), financing (the interest on your loan), insurance, fuel, and maintenance. Two cars with the same sticker price can cost thousands of dollars apart once you add those up, because one holds its value and sips gas while the other doesn't. The monthly payment is just the financing slice, not the whole picture, which is why a "great deal" on the loan can still be a bad deal on the car. Use the cost-to-own calculator to see the full five-year total for any car you're considering, not just the payment.
How a car loan works, and the affordability rule that keeps you out of trouble
A car loan splits your payment into two parts: principal (what you borrowed) and interest (what the lender charges for lending it). Your rate depends heavily on your credit; see what counts as a good credit score to see where you stand, since a weak score can add thousands in interest over the life of the loan. Financially, the loan is safest when it follows the 20/4/10 rule: put down at least 20%, finance for no more than 4 years, and keep your total car costs, meaning payment plus insurance plus fuel, under 10% of your gross income. Shorter loans and bigger down payments mean less interest and less risk of owing more than the car is worth. Run your numbers through the car loan calculator to see your payment, total interest, and whether you pass the 20/4/10 test.
How a lease actually works
A lease isn't financing the whole car, it's paying for the slice of the car's value you'll use up plus a rent charge for the privilege of borrowing the rest. Three numbers set your payment: the cap cost (the negotiated price you're leasing from), the residual value (what the car is predicted to be worth when the lease ends), and the money factor (the lease's interest rate, usually shown as a small decimal like 0.00125). Your depreciation charge is roughly the cap cost minus the residual, spread over the term; the rent charge is roughly the cap cost plus residual, multiplied by the money factor. A higher residual means a lower payment, because you're financing less of the car's value. Plug in your own cap cost, residual, and money factor in the car lease calculator to see the payment broken into those two pieces, and to compare leasing against buying the same car outright.