APR (Annual Percentage Rate)

What APR includes

APR is meant to be a more honest cost-of-borrowing number than the bare interest rate. On a typical loan, it bundles:

• The stated interest rate
• Origination fees
• Discount points (mortgage)
• Mortgage insurance (in some calculations)
• Certain other recurring fees

It does not include compounding effects. That's APY, the related but distinct measure that captures how often interest compounds within a year. For deposits, APY is the right number to compare; for loans, APR is.

Why two loans with the same rate can have different APRs

Imagine two 30-year mortgages, both at a 7% rate, both for $400,000. Loan A has $0 in fees; Loan B has $4,000 in origination fees and 1 discount point ($4,000). Loan A's APR is 7.00%; Loan B's APR is roughly 7.20%, because the calculation effectively spreads those upfront fees over the life of the loan and reports them as if they were higher interest.

This is why APR is the field consumers should compare — not the headline rate. A "low rate" loan loaded with fees may have a higher true cost than a slightly higher rate without fees.

Truth in Lending Act

In the US, the Truth in Lending Act (1968) requires consumer lenders to disclose APR prominently in standardized formats. The intent is to make products comparable across lenders. Coverage extends to credit cards, auto loans, mortgages, and most other consumer credit. Different jurisdictions have similar rules — the EU's Consumer Credit Directive defines an "Annual Percentage Rate of Charge" (APRC) with broadly similar mechanics.

Credit cards

Credit-card APRs are a common point of confusion. The card's APR is the annualized rate that applies to balances carried past the grace period. Because credit-card interest typically compounds daily, the effective annual rate paid is higher than the stated APR — closer to APY. A card with a 24% APR carrying an average $5,000 balance for a year actually costs about $1,289 in interest, not $1,200.

Cards also often have multiple APRs in a single agreement: purchase APR, cash-advance APR, balance-transfer APR, penalty APR. Cash-advance and penalty APRs run far higher than purchase APR and accrue from day one, with no grace period.

When APR understates the true cost

Short-term loans are a particular case where APR can mislead in either direction. A two-week payday loan with a $15 fee per $100 borrowed has an APR of roughly 391% — a real cost relative to the loan size, but the borrower never actually pays the annualized version because the loan only lasts two weeks. The $15 fee is the practical cost; the 391% APR is technically accurate but emotionally heavier than the underlying transaction.