When comparing loan offers, most people focus on the monthly payment. The smarter comparison uses APR — but only if you understand what it includes and what it doesn’t. The difference between a 6.5% rate and a 6.9% APR on the same loan isn’t a rounding error. It’s the total cost of the fees you’ll pay to borrow.
Quick Answer
The interest rate is the annual cost of borrowing the principal. It determines your monthly payment. The APR (Annual Percentage Rate) is the interest rate plus lender fees, expressed as a single annualised number. APR is always equal to or higher than the interest rate. The wider the gap, the more fees the lender is charging. Always compare APR — not just interest rates — when evaluating loan offers.
What the Interest Rate Tells You
The interest rate is the simplest number in any loan offer. It’s the percentage of the outstanding balance charged annually as interest. For a $20,000 personal loan at 8% interest over 36 months, your monthly payment is approximately $627. The interest rate determines exactly this: what you pay each month.
What the interest rate does not tell you: how much the loan costs in total, including what you paid upfront to get it.
What APR Adds
APR includes the interest rate plus any fees the lender charges to originate the loan. These fees are converted to an equivalent annualised percentage — as if you were paying them as additional interest spread over the loan term.
Common fees included in APR:
- Origination fees — typically 1–8% of the loan amount on personal loans
- Points — prepaid interest paid at closing on mortgages (1 point = 1% of loan)
- Underwriting and processing fees — lender administrative costs
- Mortgage broker fees — if applicable
APR generally does not include: appraisal fees, title insurance, prepaid homeowner’s insurance, or escrow deposits.
The Math Behind the Gap
Here’s why APR is higher than the stated rate.
Suppose you borrow $20,000 at 8% for 36 months. Monthly payment: $627. Total paid: $22,572. Total interest: $2,572.
Now suppose the lender charges a $500 origination fee, deducted from your loan proceeds. You receive $19,500 but still owe $20,000 and still pay $627/month. You’ve effectively borrowed $19,500 at a cost of $2,572 in interest plus $500 in fees — for a true cost of $3,072. Spread over 36 months, this works out to approximately 9.6% APR even though the stated rate was 8%.
The bigger the fees relative to the loan size — and the shorter the loan term — the larger the gap between rate and APR.
Comparing Two Loan Offers: A Real Example
| Loan A | Loan B | |
|---|---|---|
| Loan Amount | $20,000 | $20,000 |
| Interest Rate | 7.5% | 8.2% |
| Origination Fee | $800 (4%) | $0 |
| APR | 9.1% | 8.2% |
| Monthly Payment | $622 | $630 |
| Total Interest | $2,392 | $2,680 |
| Total Fees | $800 | $0 |
| Total Cost | $3,192 | $2,680 |
Loan A has the lower stated rate and lower monthly payment — but costs $512 more overall because of the origination fee. APR correctly identifies Loan B as the better deal: 8.2% vs 9.1%.
The monthly payment difference ($622 vs $630) is only $8 — easy to miss if you’re comparing by payment alone.
When APR Can Be Misleading
APR is calculated assuming you hold the loan to maturity. This creates a distortion when you plan to pay off early.
Short payoff timeline: If you plan to sell a home in 3 years on a 30-year mortgage, the upfront costs of a low-rate, high-fee loan are spread over only 3 years — not 30. The effective cost is much higher than the APR suggests. In this case, total out-of-pocket cost over your expected hold period is a more useful metric than APR.
Refinancing likelihood: If interest rates fall and you refinance in 2–3 years, you won’t recoup the cost of paying points at origination. Lower upfront cost (higher APR, fewer fees) may be better.
The rule: for long-term loans you’ll hold to maturity, minimise APR. For shorter expected hold periods, minimise upfront costs and compare total interest paid over your timeline.
Using APR When Shopping for Loans
-
Get the Loan Estimate (mortgages) or the full fee disclosure (personal loans) before comparing rates. Advertised rates rarely include fees.
-
Calculate the APR gap: if the rate is 7.0% and the APR is 7.4%, the 0.4% gap represents approximately $1,200 in fees on a $300,000 mortgage over 30 years. Is it justified?
-
Compare same-term loans: APR comparisons are only valid between loans of the same term. A 15-year and 30-year mortgage APR can’t be directly compared.
-
Use the Loan Calculator to model total interest paid under each offer’s stated rate, then add fees separately. This gives you the real total cost for any payoff timeline.
Summary
The interest rate tells you your monthly payment. APR tells you the total annualised cost including fees. For comparing offers: always use APR. For computing payments: use the interest rate. When you plan to pay off early, compute total cost over your actual timeline rather than relying on APR alone.
A loan with a lower rate but higher APR is paying you in a lower payment while costing you more overall. Know which number you’re looking at before you sign.