APR vs Interest Rate — What Actually Matters?

By Adam Styer | NMLS #513013 | April 12, 2026

Your interest rate determines your monthly payment. APR (annual percentage rate) rolls in lender fees to show the "true" annual cost. But APR assumes you keep the loan for 30 years — most people don't. For a real comparison, calculate total interest plus total fees over 5 years.

I'm Adam Styer, mortgage broker in Austin TX, NMLS #513013. Every week someone sends me two Loan Estimates and asks, "Which one has the better rate?" That question is more complicated than it looks. Here's why — and here's the simple math that actually answers it.

What Is the Difference Between APR and Interest Rate?

Your interest rate is the percentage the lender charges you on your loan balance. It's the number that determines your monthly principal and interest payment. A $400,000 loan at 6.75% has a different payment than the same loan at 7.00%. Simple.

APR takes that rate and adds in certain lender fees — origination charges, discount points, mortgage insurance premiums, and some closing costs — then amortizes them across the full term of the loan. The result is a single number meant to represent the "true" annual cost of borrowing.

APR is always higher than or equal to the interest rate. The gap between the two tells you how much the lender's fees add to your annual cost. A loan at 6.75% with an APR of 7.10% has more baked-in fees than a loan at 6.75% with an APR of 6.85%.

On paper, that sounds useful. In practice, it's more complicated.

Why Is APR Sometimes Misleading?

APR math spreads upfront costs across 30 years. That's the key problem.

Say you're comparing two offers on a $400,000 loan:

• Loan A: 6.625% rate, $8,000 in closing costs, APR of 6.92%
• Loan B: 6.875% rate, $3,500 in closing costs, APR of 7.01%

APR says Loan A is cheaper. And if you keep it for 30 years, it is — you pay a lower rate for three decades, and the $4,500 in extra upfront fees eventually gets absorbed.

But what if you sell in 5 years? Or refinance in 7? Now you paid $4,500 more upfront and only got 5–7 years of a slightly lower payment to show for it. In many cases, Loan B — the one with the higher APR — would have actually cost you less.

The average homeowner keeps a mortgage for about 5–7 years before selling or refinancing. APR doesn't account for that. It assumes you ride the full 30. Most people don't.

When Should I Use APR to Compare?

APR works well in one specific scenario: when two loans have identical terms and you plan to keep the loan a long time.

Same loan amount, same loan type, same term, same lender fees structure — and you genuinely expect to stay in the home and keep the mortgage for 15–20+ years. In that narrow case, the lower APR is probably the better deal.

Outside of that? APR is a starting point, not an answer. It doesn't tell you:

• Which loan costs less if you sell in 5 years
• Which loan costs less if rates drop and you refinance
• Whether the difference in monthly payment matters more than the difference in upfront cost

For most borrowers I work with, the holding period comparison is a better tool. If you want to see how your specific scenario plays out, upload your Loan Estimate and I'll run the numbers.

What's a Better Way to Compare Mortgage Cost?

The best metric is total cost over your actual holding period. Here's the formula:

Total 5-year cost = (monthly payment x 60) + total closing costs

That's it. No assumptions about 30 years. No amortization tricks. Just: how much money leaves your pocket over the time you actually plan to have the loan?

Let's use the same two loans from earlier on a $400,000 balance:

• Loan A (6.625%, $8,000 costs): $2,561/mo x 60 = $153,660 + $8,000 = $161,660
• Loan B (6.875%, $3,500 costs): $2,627/mo x 60 = $157,620 + $3,500 = $161,120

Over 5 years, Loan B costs $540 less — even though it has the higher APR. The lower closing costs more than offset the slightly higher payment.

This is why I run this comparison for every borrower who's choosing between offers. The answer changes depending on how long you plan to stay. If you're comparing two mortgage offers right now, here's a deeper walkthrough on how to compare two mortgage offers.

How Do Points and Credits Affect APR?

This is where APR gets genuinely confusing — even for people in the industry.

Discount points are upfront fees you pay to buy down your rate. One point = 1% of the loan amount. Paying a point lowers your rate but raises your closing costs. Since APR factors in those costs, paying points can actually increase your APR even though your rate went down. That's counterintuitive, but it's how the math works.

Lender credits work the opposite direction. The lender gives you money toward closing costs in exchange for a higher rate. Your rate goes up, your closing costs go down, and your APR can actually decrease — even though you're paying more interest every month.

This means a lender offering credits can show a lower APR than a lender with a legitimately cheaper loan. The APR looks better on paper, but you're locked into a higher rate for the life of the loan.

The fix is the same: run the total cost comparison over your holding period. Points make sense if you're keeping the loan long enough to recoup the upfront cost through lower payments. Credits make sense if you want to minimize cash to close and don't plan to keep the loan very long.

For a broader look at what else to evaluate beyond rate and APR, see what to compare besides rate.

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