Car Buying & Auto Finance
Know the real cost of the car before you sign at the dealer.
A car is the second-largest purchase most people make, and the dealership is designed to sell it on the monthly payment — the one number that hides the term, the interest and the fees. Two cars with the same payment can differ by thousands in true cost.
These tools break the payment back down into what you finance, what the interest costs, and what a longer term or a rolled-in trade-in balance really adds. The goal is simple: walk in knowing the numbers before anyone else does the math for you.
Tools
Auto & Car Finance calculators
Auto Loan Calculator
See your real monthly payment after tax, trade-in and fees — plus the total interest a longer term quietly adds.
Car Affordability Calculator
Work backwards from your income to a car price you can actually carry — payment, insurance, fuel and all.
Car Lease Calculator
Break a lease into its real parts — depreciation, finance charge and tax — and see the money factor as a plain APR.
Auto Refinance Calculator
Compare your current car loan to a new one — monthly savings, lifetime savings and the break-even on fees.
Total Cost of Car Ownership Calculator
The real cost of a car isn't the payment — it's depreciation, insurance, fuel, maintenance and interest combined.
Most used here
Related goals
See how auto & car finance fits into the bigger picture.
Save More Money
Build the cushion, automate the habit, and raise the yield.
Get Out of Debt
A payoff date beats a vague intention every time.
Not sure where to start?
Describe your auto & car finance situation and the AI coach will point you to the right tool and walk through the trade-offs.
Auto & Car Finance questions
How much car can I afford?
A common guideline keeps all car costs — payment, insurance, fuel and maintenance — under 15–20% of your take-home pay, and finances over no more than 60 months with at least 10–20% down. If a car only fits your budget at a 72- or 84-month term, that's a strong signal it's more than you can comfortably afford. Run your numbers through the auto loan calculator and check the payment against your debt-to-income ratio.
Is a longer car loan term a bad idea?
Usually. A 72- or 84-month loan lowers the monthly payment but raises total interest and keeps you underwater — owing more than the car is worth — for most of the term. Because cars depreciate fastest in the first few years, a long loan means years of negative equity. Financing over 60 months or less is the safer default.
Should I put money down on a car?
Yes. A down payment lowers the amount you finance (so you pay less interest), reduces your payment, and protects you from going underwater early when depreciation is steepest. The traditional benchmarks are 20% down on a new car and 10% on a used one.
Does trading in a car reduce my sales tax?
In most US states, yes — sales tax is charged on the price after subtracting the trade-in value, which can save several hundred dollars. A few states tax the full price regardless. Beyond tax, positive trade equity lowers the amount you finance, while negative equity (owing more than the trade is worth) gets added to the new loan and should be avoided where possible.