Interest rate and APR (Annual Percentage Rate) are related but not interchangeable, and lenders are required to disclose both for a reason: they answer different questions. The interest rate tells you the cost of borrowing the principal itself. The APR tells you the cost of the loan overall, including certain fees, expressed as a yearly rate.
What's actually included in each
The interest rate is applied directly to your outstanding balance to calculate the interest charged each period. APR takes that same interest rate and layers in certain additional costs of the loan — things like origination fees, discount points, or certain mortgage closing costs — then spreads that combined cost over the loan term as a single annualized percentage.
Why APR is usually the higher number
Because APR bundles in extra costs, it's typically equal to or higher than the stated interest rate — the gap between the two roughly reflects how much you're paying in fees relative to the loan amount and term. A wide gap between interest rate and APR on a loan offer is a signal to look closely at what fees are being charged, since a low advertised interest rate can hide a less competitive offer once those fees are included.
Where this distinction matters most
- Mortgages, where origination fees, discount points, and certain closing costs can meaningfully widen the interest rate/APR gap between lenders.
- Credit cards, where APR is usually presented as effectively the same as the interest rate, since cards typically don't bundle in the kind of upfront fees a mortgage does — but cards can carry multiple APRs (purchase, balance transfer, cash advance), which is its own comparison to make carefully.
- Personal loans, where an origination fee deducted from the loan proceeds can make the APR notably higher than the stated interest rate.
A practical way to compare offers
When two loan offers have similar terms and loan amounts, comparing APRs gives a more apples-to-apples read on total cost than comparing interest rates alone. That said, APR calculations can still vary somewhat by lender depending on which fees are included, so it's worth asking directly what's built into the number, especially for a mortgage.
Neither number alone tells the whole story on its own, but together they separate "what does borrowing this money cost per year" (interest rate) from "what does this loan cost overall, annualized" (APR) — a distinction worth understanding before signing anything with either number on it.