Annual Percentage Rate (APR)

APR, or Annual Percentage Rate, is the yearly cost of a loan expressed as a single percentage, required on US loans and cards under Regulation Z of the Truth in Lending Act. For mortgages and auto loans it folds origination fees and points into the rate, which makes it the closest thing borrowing has to an apples-to-apples quote. For credit cards the APR is the rate applied to carried balances, and cards compound daily on top of it. A 22% APR compounded daily costs roughly 24.6% a year in effective terms.

The distinction that matters is APY versus APR: APY measures what a deposit earns and includes compounding; APR measures what a loan costs and includes fees but generally excludes compounding. The two are not comparable, and treating them as siblings has a precise cost. A card at 22% APR and a HYSA at 4.5% APY are 17.5 points apart before compounding, and wider after it. Every American loan quote carries both a rate and an APR, and the APR is the honest one.

For a mortgage, the lender computes the APR as the rate that makes the loan's payments, net of fees, equal to the amount you actually received. Take a $300,000 loan at a 6.5% note rate with $6,000 in fees. You borrowed $300,000 and received $294,000, so the APR is the rate that prices $1,896 monthly payments against $294,000, which lands at roughly 6.71%. The note rate is the headline; the APR is the loan with the fees priced in. That is why APRs sit above note rates whenever fees exist.

For a credit card, the APR is simpler and meaner. The daily rate is the APR divided by 365, applied to your average daily balance, and interest compounds on interest. A 22% APR becomes a daily rate of 0.0603%, compounding to roughly a 24.6% effective annual cost. The one escape is the grace period: pay the statement balance in full by the due date and no interest applies at all, which is why the APR is irrelevant to anyone who pays in full and central to everyone who does not.

APR appears on every borrowing decision an American makes: the mortgage quote, the auto loan, the personal loan, and the card statement, all disclosed under Regulation Z with the CFPB enforcing the rules. On mortgages, the APR is the only number that makes quotes with different fee structures comparable. A 6.5% note with heavy fees is not the same loan as a 6.5% note with none. On cards, the APR is the rate that applies the moment a balance is carried, and the average card APR sits in the low-to-mid 20s.

I watched a colleague named Brent (yes, that Brent) take a 6.50% note with $6,000 in points over a 6.75% with none, planning to sell within three years. The points saved $50 a month, which breaks even in ten years; he sold in year three and donated the difference to the bank.

The highest-leverage thing most Americans can do is compare APR to APR on every loan quote and pay card statements in full so the grace period does the work. Run the payoff arithmetic through the credit card payoff calculator or the mortgage amortization calculator before signing either.