When you apply for a loan, lenders advertise two numbers: the interest rate and the APR. Many borrowers focus only on the interest rate — the smaller, more attractive number. That is a mistake. The APR is what you should compare. Here is why.
APR vs. Interest Rate: What Is the Difference?
The interest rate is the cost of borrowing the principal, expressed as an annual percentage. It does not include any fees. The APR (Annual Percentage Rate) includes the interest rate plus most fees associated with the loan: origination fees, broker fees, closing costs (on mortgages), and other charges. It represents the true annual cost of the loan.
By law in the United States, lenders must disclose APR on all loan offers. This lets you compare two loans with different interest rates and fee structures on an equal footing.
Simple rule: Always compare APR — not the interest rate — when shopping for loans. The interest rate tells you nothing about the fees you will pay.
A Real Example: Two Mortgage Offers
Imagine two lenders offer you a $300,000 mortgage for 30 years:
| Lender | Interest Rate | Fees | APR | Monthly Payment | Total Cost |
|---|---|---|---|---|---|
| Lender A | 6.50% | $0 | 6.50% | $1,896 | $682,560 |
| Lender B | 6.25% | $8,000 | 6.52% | $1,847 | $692,920 |
Lender B has a lower interest rate (6.25% vs 6.50%) and a lower monthly payment ($1,847 vs $1,896). But Lender B's APR is higher (6.52% vs 6.50%) because of the $8,000 in upfront fees. If you stay in the home for 30 years, Lender B costs you $10,360 more in total. Lender A is the better deal — the APR revealed this immediately.
When a Lower APR Is Not Always Better
APR assumes you keep the loan for its full term. If you plan to refinance in 3 years or sell the house in 5 years, the calculation changes. A loan with higher fees but a much lower rate might save money if held long enough, but break even poorly for short-term holders.
The break-even point is: upfront fees ÷ monthly savings = months to break even. For Lender B above: $8,000 ÷ ($1,896 − $1,847) = $8,000 ÷ $49 = 163 months (13.6 years). If you keep the mortgage less than 13.6 years, Lender A — with no fees — is better.
APR on Credit Cards
Credit card APR works differently from loan APR. Most credit cards compound interest daily. The daily periodic rate is APR ÷ 365. On a 20% APR card, if you carry a $3,000 balance for a full year without paying it off, you will pay approximately $660 in interest — and that is before compounding is accounted for.
Variable vs Fixed APR: Credit card APRs are almost always variable, tied to the prime rate. When the central bank raises rates, your credit card APR rises automatically. A loan with a fixed APR will not change over the life of the loan.
What Affects Your APR?
- Credit score: The single biggest factor. Excellent credit (750+) can get you rates 2–4% lower than fair credit (580–669).
- Loan type: Secured loans (mortgage, car) have lower APRs than unsecured loans (personal, credit cards).
- Loan term: Shorter terms generally have lower rates but higher monthly payments.
- Market interest rates: Central bank policy sets the base rate that lenders use as a starting point.
- Lender fees: Origination fees, discount points, and closing costs all feed into APR.
Mortgage Points: Paying to Lower Your APR
On mortgages, you can pay "discount points" upfront to lower your interest rate. One point = 1% of the loan amount. On a $300,000 mortgage, one point = $3,000. This lowers your interest rate by approximately 0.25%, which reduces your monthly payment and total interest paid.
Whether this is worth it depends on how long you keep the mortgage. Use the same break-even calculation: points paid ÷ monthly savings = months to break even. If you sell before break-even, points were a loss.
Calculate your real loan costs including total interest paid
Try the Loan Calculator →Key Takeaways
- APR = interest rate + fees, expressed as an annual percentage
- Always compare APR — not the interest rate — when comparing loans
- Lower APR = lower total cost over the full loan term
- If you plan to keep the loan short-term, also calculate the break-even point for fees
- Credit card APRs compound daily and are typically variable
- Your credit score has the biggest impact on the APR you are offered