APR vs. Interest Rate: What's the Difference?
Interest rate and Annual Percentage Rate (APR) both describe the cost of borrowing money, but they measure different things.
Official Source: Consumer Financial Protection Bureau (CFPB) — "What Is the Difference Between a Mortgage Interest Rate and an APR?" — https://www.consumerfinance.gov/ask-cfpb/what-is-the-difference-between-a-mortgage-interest-rate-and-an-apr-en-135/
According to the CFPB, the interest rate reflects only the cost of borrowing the principal loan amount, while the APR reflects the interest rate plus additional charges such as points, broker fees, and other loan costs. Because APR captures more of the total cost, it's generally the better number to use when comparing loan offers from different lenders — but only if you understand exactly what it includes and doesn't include.
Table of Contents
- Definition
- The Formula Behind APR
- Why APR Is Usually Higher Than the Interest Rate
- Interest Rate vs. APR: Side-by-Side Comparison
- Where to Find Your APR on a Loan Estimate
- When APR Comparisons Can Be Misleading
- Step-by-Step: Using APR to Compare Loans
- A Real-World Example
- Common Mistakes
- Expert Tips
- Related Calculators
- Frequently Asked Questions
- References
- Conclusion
Definition
Interest rate is the cost charged by a lender for borrowing the principal loan amount, expressed as a percentage. Annual Percentage Rate (APR) is a broader measure that includes the interest rate plus certain additional fees required to obtain the loan, also expressed as a yearly percentage.
The Formula Behind APR
APR is calculated under federal Regulation Z using the total finance charge (interest plus certain fees) spread over the life of the loan. The general relationship can be expressed as: Formula: APR = [(Interest Charges + Loan Fees) ÷ Principal] ÷ Loan Term (in days) × 365 × 100 In practice, lenders use standardized tables and calculation methods required under Regulation Z rather than this simplified version, since actual APR calculations account for payment timing and compounding. The key takeaway is that APR always incorporates more of the loan's total cost than the interest rate alone.
Why APR Is Usually Higher Than the Interest Rate
Because APR folds in fees like discount points, origination charges, and certain closing costs, it is typically higher than the quoted interest rate on the same loan. The size of the gap between the two numbers tells you how much you're paying in fees relative to the loan amount — a large gap suggests higher upfront fees, even if the interest rate itself looks competitive.
Interest Rate vs. APR: Side-by-Side Comparison
| Factor | Interest Rate | APR |
|---|---|---|
| What It Measures | Cost of borrowing the principal only | Interest rate plus additional loan fees |
| Used For | Calculating your monthly principal and interest payment | Comparing the total cost of different loan offers |
| Typically Higher or Lower | Lower of the two | Higher of the two |
| Required Disclosure | Disclosed on the Loan Estimate | Disclosed on the Loan Estimate and Closing Disclosure under the Truth in Lending Act |
| Best Used For | Payment calculations | Apples-to-apples loan comparisons |
Where to Find Your APR on a Loan Estimate
If you've received a Loan Estimate, the interest rate appears on the first page under "Loan Terms," while the APR appears on the third page under "Comparisons." According to the CFPB, comparing the APR figures across multiple Loan Estimates is one of the more reliable ways to evaluate competing loan offers, since it accounts for more of the total cost than the interest rate alone.
When APR Comparisons Can Be Misleading
APR isn't a perfect comparison tool in every situation. The CFPB cautions that:
- Comparing the APR of a closed-end loan to the APR of a home equity line of credit (HELOC) can be misleading, since HELOC APRs typically don't include the same fee structure.
- APR calculations can behave differently for adjustable-rate loans, since the APR reflects an assumption about future rate changes that may not match what actually happens.
- A lower APR doesn't always mean a better loan if you don't plan to keep it for the loan's full term, since some upfront fees are spread out over the assumed full term in the calculation.
Step-by-Step: Using APR to Compare Loans
- Request Loan Estimates from multiple lenders for the same loan amount and term.
- Compare the interest rate on page 1 of each Loan Estimate to understand your base payment.
- Compare the APR on page 3 of each Loan Estimate to evaluate total cost, including fees.
- Confirm whether you're comparing similar loan products, since APR calculations differ between closed-end loans and lines of credit.
- Factor in how long you plan to keep the loan, since APR assumes you'll hold it for the full term.
- Ask your lender to clarify any fees included in the APR that you don't fully understand.
A Real-World Example
Two lenders offer the same $300,000 loan amount and term. Lender A quotes a 6.25% interest rate with $2,000 in fees, resulting in an APR of about 6.40%. Lender B quotes a lower 6.10% interest rate but with $8,000 in fees, resulting in an APR of about 6.55%. Even though Lender B's interest rate looks more attractive, its higher APR reveals that the total cost of the loan is actually higher once fees are factored in — information the interest rate alone wouldn't show.
Common Mistakes
- Comparing the interest rate from one lender to the APR from another, rather than comparing like to like.
- Assuming a lower interest rate always means a cheaper loan, without checking the APR.
- Comparing a closed-end loan's APR directly to a HELOC's APR, which can be misleading due to different fee structures.
- Not asking which specific fees are included in a quoted APR.
- Ignoring how long you plan to keep the loan, which affects whether the APR's assumptions apply to your situation.
Expert Tips
- Always request the APR, not just the interest rate, when comparing loan offers from multiple lenders.
- Ask each lender for an itemized list of fees included in their APR calculation.
- If you plan to sell or refinance before the end of the loan term, discuss with your lender how that affects the relevance of the quoted APR.
- Review both the interest rate and APR on your Loan Estimate side by side rather than focusing on just one number.
Related Calculators
Related Articles
- What Are Mortgage Discount Points and Should You Buy Them?
- Closing Costs Explained: What to Expect When Buying a Home
Frequently Asked Questions
Is APR always higher than the interest rate?
In most cases, yes, since APR includes additional fees on top of the interest rate. For some credit cards, the interest rate and APR can be the same if no additional fees apply.
Should I compare loans using APR or interest rate?
APR generally gives a more complete picture of total loan cost since it includes fees, making it useful for comparing similar loan offers. However, always confirm you're comparing the same loan type and term.
Why shouldn't I compare a HELOC's APR to a mortgage's APR?
HELOCs and closed-end loans calculate APR differently, and HELOC APRs typically don't include the same fees as a closed-end loan's APR, which can make a direct comparison misleading.
Can my APR change after closing?
For a fixed-rate loan, the APR is calculated based on the loan's terms at origination and doesn't change. For adjustable-rate loans, the APR reflects assumptions about future rate changes that may or may not match what actually happens.
References
- Consumer Financial Protection Bureau – Mortgage Interest Rate vs. APR
- Consumer Financial Protection Bureau – Regulation Z, Determination of Annual Percentage Rate
- Consumer Financial Protection Bureau – Loan Interest Rate vs. APR
Conclusion
Interest rate and APR measure different things: the interest rate reflects only the cost of borrowing your principal, while APR incorporates additional fees to give a fuller picture of total loan cost. Comparing APRs across similar loan offers is generally a more reliable way to shop for a mortgage or loan than comparing interest rates alone. This article is educational only and not financial advice; APR calculations and disclosure requirements can vary by loan type, so review your specific Loan Estimate and consult your lender with questions.