Interest Rate vs. APR: What’s the Real Cost of a Loan?

What Is the Interest Rate?

The interest rate on a loan is the cost you pay to the lender for borrowing money, expressed as a percentage of the principal. It is the basic rate used to calculate your monthly interest charges on the amount you borrow.

The interest rate itself does not include any upfront fees or closing costs you might pay to get the loan.

• It is a percentage of the principal.
• It is used to calculate interest payments.
• It does not include lender fees or other charges.
• It is the rate you see most often in loan advertising.

Sources: Consumer Financial Protection Bureau, OneMain Financial

What Is APR?

APR stands for Annual Percentage Rate. It is the interest rate plus any additional fees charged by the lender, such as origination charges, expressed as a percentage. APR is designed to give a more complete picture of what a loan really costs per year.

Both the interest rate and APR are expressed as percentages, but they measure different things. The interest rate is the cost of borrowing the principal, while the APR includes the interest rate plus other costs you pay to get the loan.

• APR = interest rate + certain fees spread over the loan term.
• It includes costs like origination fees, and may exclude others like appraisal fees or title insurance.
• It is standardized under federal law so you can compare offers from different lenders.
• For credit cards, the interest rate and APR are the same thing.

Sources: Consumer Financial Protection Bureau, Calculator.net, Experian

Key Differences Between Interest Rate and APR

The main difference is what each number includes. The interest rate reflects only the interest charge; APR includes interest plus certain fees. Because of those added costs, APR is usually higher than the interest rate.

The interest rate determines your monthly interest payment, while the APR is used to compare the overall costs of different loan options. When you shop for a loan, comparing APRs helps you see the true cost, especially if one loan has higher fees but a lower interest rate.

• Interest rate is the base cost of borrowing; APR is a broader measure.
• APR typically exceeds the interest rate when fees are included.
• The interest rate drives your interest payments; APR helps you compare total costs.
• APR may not include every possible fee, so it is not always a complete picture.

Sources: Consumer Financial Protection Bureau, Discover, OneMain Financial

How to Compare Loans Using APR

When comparing loan offers, the APR is a better tool than the interest rate alone because it factors in fees that increase the true cost. The federal Truth in Lending Act requires lenders to disclose the APR before you finalize a loan, so you have that information up front.

A loan with a lower interest rate may not be the cheapest option if it carries higher fees. By looking at the APR, you can see which loan costs less overall. However, it is important to compare APRs to APRs and not mix APRs with interest rates.

APR is calculated using a standardized formula that includes interest, fees, loan amount, and loan term. This consistency allows you to compare offers from different lenders on the same basis.

• Always compare APR to APR, not APR to interest rate.
• Check what fees are included in the APR; lenders may use some discretion.
• A lower APR usually means lower total borrowing costs.
• Use APR as a starting point, then review the loan’s terms and all fees.

Sources: Consumer Financial Protection Bureau, OneMain Financial, Discover, Calculator.net

Limitations of APR Comparisons

While APR is a useful measure, it has limitations. APR does not account for the compounding of interest; it assumes simple interest. If a loan compounds more frequently, the true cost may be higher than the APR suggests.

APR may also understate the true cost if you pay off the loan early. Upfront fees are spread over the full loan term in the APR calculation, so if you repay sooner, the effective cost per year can be higher than the APR suggests.

Not all fees are included in APR. Lenders may exclude certain charges, such as appraisal fees, title insurance, or prepaid items. Because lenders have some discretion, it is important to review what fees are actually included and ask for a full disclosure of all costs.

• APR assumes simple interest, not compounding.
• Paying off a loan early can make the APR understate your true cost.
• Excluded fees vary by lender and loan type.
• Always read the loan estimate or disclosure to see what’s included.

Sources: Calculator.net

Example: How Fees Affect APR

To see how fees affect APR, consider a $10,000 personal loan with a 16% interest rate and a $500 origination fee. Over a three-year term, the APR works out to about 19.51%, higher than the stated interest rate because the fee is folded into the annual cost.

• A $10,000 loan at 16% interest with a $500 fee over 3 years has an APR of about 19.51%.
• The APR is higher than the interest rate because it includes the fee.
• Comparing APRs lets you see which loan truly costs less.

Sources: Experian

Special Cases: Mortgages and Short-Term Loans

Mortgages often have APRs that include not only the interest rate but also points, mortgage broker fees, and other charges paid to get the loan. This can make the APR noticeably higher than the stated interest rate, especially if you pay discount points.

For short-term loans, such as payday loans, APR can be extremely high because fees are spread over a very short term. For example, a payday loan might have a stated interest rate that seems modest, but the APR can be hundreds of percent due to fees and the short repayment period. In such cases, the total amount you repay may be more relevant than the APR alone.

• Mortgage APR includes points, broker fees, and other loan costs.
• Payday loans often have APRs far exceeding their nominal interest rates.
• For short-term loans, consider the total cost, not just the APR, when deciding whether to borrow.

Sources: Consumer Financial Protection Bureau