APR vs Interest Rate: What Actually Matters When You Borrow
The exact difference between APR and interest rate, why lenders quote both, and which one to use when comparing loan offers.
The plain-English difference
- Interest rate — What you pay the lender for borrowing the money, expressed annually.
- APR (Annual Percentage Rate) — The interest rate plus upfront fees, origination costs, and points, spread across the loan term and re-expressed as an annualized rate.
APR is always higher than or equal to the interest rate. If they're equal, the loan has zero fees.
Why lenders quote both
The interest rate determines your monthly payment. The APR reflects the true cost including fees. Regulation (TILA in the US) requires both because a low interest rate with high fees can be more expensive than a higher rate with no fees — and consumers used to get fooled routinely.
Worked example
Two $300,000 mortgage offers, 30-year term:
| Offer | Rate | Origination fee | Discount points | APR |
|---|---|---|---|---|
| A | 6.25% | $3,000 | 1 point ($3,000) | ~6.44% |
| B | 6.50% | $500 | 0 points | ~6.53% |
Offer A has the lower rate and the lower APR — a clear win if you're keeping the loan long. But:
- On Offer A, you pay **50/month.
- Break-even: 50 = 120 months (10 years).
- Sell or refinance sooner and Offer B wins.
When APR misleads
APR spreads fees across the full stated term. That distorts short loans:
- You'll refinance in 3 years. APR assumes 30 years of amortization — real cost is much higher.
- Adjustable-rate mortgages. APR estimates future rates; reality varies.
- Interest-only or balloon loans. APR assumes standard amortization even when the loan structure isn't standard.
For anything you'll pay off early, model total cost over your realistic holding period, not APR.
Which number to compare
- Long-term fixed loans, no early payoff planned — Compare APR.
- Short-term loans or early payoff likely — Compare total interest + fees over your holding period.
- Loans with the same fees — Compare the interest rate (APR is redundant).
Run the numbers
The APR calculator converts a rate-plus-fees quote into a true APR. The loan comparison calculator puts two full offers side by side and shows the total cost of each.