APR vs Interest Rate: What's the Real Difference?
When shopping for a mortgage or personal loan, you'll see two rates: the interest rate and the APR (Annual Percentage Rate). They sound similar, but the difference can cost you thousands of dollars over the life of a loan.
Interest Rate: The Cost of Borrowing
The interest rate is simply the percentage the lender charges you each year to borrow money. It's the "base price" of your loan. For example, a $300,000 mortgage at 6.5% interest means you pay 6.5% of the balance per year — but the interest rate alone doesn't include the fees required to get the loan.
APR: The True Cost
APR includes the interest rate plus any lender fees, points, mortgage broker fees, and certain closing costs. This makes APR higher than the interest rate in almost every case. Because APR includes fees, it gives you a more accurate picture of what you'll actually pay.
For example, a loan might advertise 6.0% interest but have 1.5 points ($4,500 on a $300,000 loan) plus $3,000 in origination fees. That brings the APR to roughly 6.4%. The lower rate looks better in ads, but the APR tells the real story.
Key Differences
- Interest rate: Based solely on the loan amount and your creditworthiness
- APR: Interest rate + all mandatory fees (origination, points, processing, underwriting)
- APR is always higher than the interest rate when fees exist
- Use APR to compare loans, not the interest rate — it's the true cost
When It Matters Most
The gap between interest rate and APR matters more for mortgages than short-term loans, because mortgages have high closing costs spread over 15-30 years. A difference of 0.3% in APR on a $300,000 mortgage can mean $15,000+ in extra payments over 30 years.
Why Lenders Advertise the Interest Rate
Lenders prominently display the interest rate because it is almost always lower than the APR. A 6.0% interest rate looks more attractive than a 6.4% APR, even though the latter reflects the true cost. Federal law requires lenders to disclose the APR in good faith estimates and closing disclosures, so always look for the APR in the fine print.
Fixed vs Adjustable: APR Differs
For adjustable-rate mortgages (ARMs), the APR calculation assumes the rate stays the same for the initial fixed period and then adjusts based on an index. This means the APR on an ARM is an estimate, not a guarantee. Fixed-rate mortgage APRs are more reliable because the rate never changes.
How to Compare Loan Offers
When you receive multiple loan estimates, compare the APRs side by side. The loan with the lower APR is generally cheaper, assuming the same loan amount and term. But also consider the loan type (fixed vs ARM), the length of time you plan to keep the loan, and whether you can afford the closing costs upfront. A loan with a slightly higher APR but lower closing costs might be better if you plan to sell or refinance within a few years.
Try the Calculator
Use CalcInstant's mortgage calculator to see how different rates affect your monthly payment and total interest:
You can also compare loan terms with our Loan Calculator to see how APR differences compound over time.