The 12 terms that come up most often when you're taking out or managing a car loan — what each one actually means, why it matters, and where to go for the full breakdown.
The yearly cost of your loan expressed as a percentage, including interest and certain lender fees — not the same as the plain "interest rate," which can be quoted without fees included. APR is the number that lets you compare offers apples-to-apples across lenders.
The amount you actually borrow — the car's price minus your down payment and any trade-in equity — before interest is added. Your monthly payment pays down both principal and interest, but early in the loan, a larger share goes to interest. This is why paying off a loan early in its term saves more total interest than paying the same extra amount later on.
The length of the loan, in months. Common terms run 36-84 months. Shorter terms mean higher monthly payments but less total interest; longer terms lower the payment but cost more overall and increase the risk of owing more than the car is worth, since depreciation often outpaces payoff in the first few years of a long-term loan.
The amount you pay upfront, reducing how much you finance. A larger down payment lowers your monthly payment, reduces total interest, and protects against negative equity by giving you a cushion between the loan balance and the car's value.
The loan amount divided by the car's value, expressed as a percentage. A lower LTV (more equity, smaller loan relative to value) generally gets you a better rate and lower approval risk. LTV above 100% means you're financing more than the car is worth.
When you owe more on your loan than the car is currently worth. This commonly happens with small or no down payments, long loan terms, or fast depreciation. If you sell or the car is totaled while underwater, you still owe the difference.
The schedule by which your loan balance is paid down over time. Early payments are weighted more toward interest; later payments are weighted more toward principal — even though your total monthly payment stays the same throughout the loan.
The credit-score bands lenders use to set your rate. Super prime (781+) gets the lowest rates; deep subprime (below 500) gets the highest. The gap between tiers is large — often 10+ percentage points between the best and worst tier for the same loan.
A conditional loan offer from a lender, given before you've picked a specific car, based on your credit and income. A pre-approval gives you a real rate to compare against dealer financing and strengthens your negotiating position at the dealership.
Run your own numbers — payment, total interest, and how term length changes the cost.
Car Loan Calculator →The difference between the rate a lender actually approves you for (the "buy rate") and the rate the dealer presents to you. Dealers are compensated for arranging financing by marking up the buy rate — commonly by 1-2 percentage points, sometimes capped by state law. This is legal but negotiable; a pre-approval from your own lender is the best defense against overpaying for dealer-arranged financing.
Coverage that pays the difference between your car's actual cash value and your remaining loan balance if the car is totaled or stolen while you're underwater. Standard auto insurance pays only the car's current value — GAP covers the gap on top of that.
Most modern auto loans use simple interest — interest is calculated only on the remaining balance each period, so paying extra or paying off early genuinely saves you interest. Some older or subprime loans use precomputed interest, where the total interest is calculated upfront over the full term; paying early saves less than you'd expect. Always confirm which method your loan uses before assuming an early payoff will save the full remaining interest.
A second person who agrees to be equally responsible for the loan, typically added to help a borrower with limited or weaker credit qualify for a better rate. The co-signer's credit is on the line too — missed payments affect both parties' credit reports, not just the primary borrower's.