Interest Rate vs. APR: What’s the Difference and Which One Matters?
When you’re comparing mortgage offers, you’ll see two rates listed: the interest rate and the APR. They’re always different, and the gap between them can tell you a lot. Here’s what each one means and how to use them together to make a smart comparison.
The Interest Rate
The interest rate is the cost of borrowing the loan itself — expressed as a percentage of the loan amount, applied annually. This is what determines your monthly principal and interest payment.
On a $300,000 loan at 7.00% for 30 years, your monthly P&I payment is $1,996. Change that rate to 6.75% and the payment becomes $1,946. The rate is the core cost of the money.
The APR — Annual Percentage Rate
The APR is a broader measure. It includes the interest rate plus most of the fees associated with getting the loan — origination fees, discount points, mortgage broker fees, and certain other closing costs — expressed as an annualized percentage.
The idea behind APR is to give you a more complete picture of the true cost of the loan. A lender could offer you a 6.5% interest rate with $5,000 in origination fees, or a 7.0% rate with no fees. The interest rates look different; the APR brings the costs into a comparable number.
Why They’re Always Different
APR is always higher than the interest rate (or equal to it if there are truly no fees). The larger the gap between your rate and APR, the more fees are baked into that loan. A rate of 7.00% with an APR of 7.08% suggests relatively low fees. A rate of 7.00% with an APR of 7.45% suggests significant fees.
The Limitation of APR for Mortgages
APR is more useful for comparing credit cards and personal loans than mortgages, for one key reason: it assumes you keep the loan for the full term. Most people don’t.
APR spreads closing costs over 30 years. If you sell or refinance in 7 years — which is closer to the average — those upfront costs hit you much harder than the APR suggests. A loan with lower fees and a higher rate might actually cost you less if you’re not holding it for 30 years.
This is why the most useful comparison isn’t just interest rate or APR — it’s total cost over your expected time in the home.
How to Actually Compare Loan Offers
When you receive a Loan Estimate from any lender, look at Section A (Origination Charges) and the interest rate side by side. Then ask yourself: how long do I realistically plan to stay in this home?
- Staying 10+ years: Paying points upfront to buy down your rate often makes sense — the monthly savings compound over time
- Staying 5–7 years: Break-even on points is typically 4–6 years; buying down may or may not make sense
- Staying under 5 years: Minimize upfront costs; take the lower-fee loan even if the rate is slightly higher
When I present loan options to buyers, I always run this break-even analysis. There’s no single right answer — it depends on your plans, your cash position, and what trade-offs you want to make.
What About Discount Points?
Discount points are prepaid interest — you pay a fee at closing in exchange for a lower interest rate. One point equals 1% of the loan amount. On a $300,000 loan, one point costs $3,000 and typically lowers your rate by about 0.25%.
Whether buying points is worth it depends entirely on your break-even horizon. I’ll always show you the math before recommending either direction.
Comparing loan offers and want a second set of eyes? Let’s talk through the numbers together →
Kiley Conner | NMLS# 1453865 | Benchmark Mortgage | Licensed in AR, MO, KS & OK | Equal Housing Lender | Rate examples are illustrative only.
