APR vs interest rate
The interest rate is the cost of borrowing; APR includes fees and shows the true annual cost.
What it means
The interest rate is the percentage your lender charges on the principal balance of your auto loan. APR (annual percentage rate) wraps that interest rate together with other mandatory fees like origination charges, documentation fees, and discount points, then expresses the total as a single annualized percentage. If you borrow $25,000 at 6% interest with $500 in fees, your interest rate is 6% but your APR might be 6.4%.
Why it matters
When you compare loan offers, looking only at interest rates can mislead you. A lender advertising 5.9% interest but charging $800 in fees may cost more over the life of the loan than one at 6.1% with zero fees. APR levels the playing field by folding those upfront costs into a single number. The difference matters most on shorter loans, where fees have less time to amortize, and on smaller balances, where a $600 fee represents a bigger percentage of what you borrow.
What to do
Always ask lenders for both the interest rate and APR in writing before you commit. If you already have a loan and the rate feels high, run our refinance verdict to see whether a lower APR is available today and whether switching saves you money after accounting for any new fees.
Simple vs precomputed interest
Two methods for calculating loan interest that determine whether paying off your loan early actually saves you money.
Prepayment penalty
A fee some lenders charge if you pay off your auto loan early or refinance before a set date.
Payoff quote, explained
The exact amount required to own your financed car outright, including interest accrued through a specific payoff date.