What is the difference between APR and the interest rate?

The interest rate is the cost of borrowing the principal, expressed as a percentage, while the APR adds lender fees and other costs to show the true annualized cost of the loan. In other words, the interest rate drives your monthly payment, and the APR gives you a way to compare the total cost of one loan against another.

Because the APR includes fees, it is almost always higher than the interest rate. The size of the gap tells you how much the fees add to the loan cost.

Two of these numbers appear on every mortgage quote, and buyers who only look at the advertised rate are looking at half the picture. The rate sets the payment; the APR sets the honest cost.

APR exists so buyers can compare loans on an apples-to-apples basis. Two lenders can offer the same advertised interest rate but charge very different fees. One might build the fees into the rate or charge points, while another adds them to closing. The APR standardizes those differences into a single number.

By law, lenders disclose both the rate and the APR on your Loan Estimate and Closing Disclosure, giving you the two numbers you need to compare offers fairly.

That standardization is regulated: lenders calculate APR under federal rules so that the number means the same thing from one lender to the next, which is why comparing APRs across lenders is a meaningful exercise rather than a marketing trick.

APR is calculated by taking the loan interest rate and folding in certain upfront costs, like origination fees and points, over the life of the loan. The exact fees included vary by lender and loan type, which is why the comparison is most useful between similar loans. Not every fee is included, so the APR is an approximation, not a perfect measure.

This is why a loan with a lower interest rate can have a higher APR: the lower rate may come with higher fees. The APR captures that trade-off.

Because the APR spreads the fees over the full loan term, the number is most accurate for buyers who will keep the loan for the entire term; short-term owners should weigh the fee breakdown directly rather than relying on the APR alone.

Use the interest rate to estimate your monthly payment and the APR to compare the overall cost of competing offers. When two loans have similar terms, the one with the lower APR generally costs less. But if you plan to move or refinance within a few years, the APR, which spreads fees over the full loan term, can understate the near-term cost.

Ask each lender for a full breakdown of fees so you understand what the APR is including. The number is a useful starting point, and the itemized costs tell the real story.

Compare Loan Estimates rather than phone quotes: the estimate lists the rate, the APR, the closing costs, and the total interest over the first five years, which is exactly the information that turns rate shopping into a real comparison.