APR versus interest rate on a mortgage

A borrower can see a 6.50% interest rate and a 6.78% APR on the same mortgage offer. Those figures answer different questions. The interest rate prices the borrowed balance. The annual percentage rate (APR) adds specified charges to that rate and expresses the broader borrowing cost as an annual rate over the loan term.

What the interest rate measures

The note rate is the rate used to calculate interest on the unpaid principal. It is the input used to calculate the scheduled principal-and-interest payment for a fixed-rate, fully amortizing loan. It does not, by itself, include points, lender fees, mortgage insurance, property taxes, or every other cost of owning the home.

For an adjustable-rate mortgage, the rate can change under the contract. Its initial rate may be discounted; later rates generally depend on the contract's index and margin and are limited by any applicable caps. The initial rate therefore may not describe the rate that applies for the full term.

What APR adds

APR is a standardized comparison measure built from the credit cost and the timing of payments. For a closed-end mortgage, it generally takes account of the interest rate and certain charges that are treated as finance charges, such as discount points and some origination or broker charges. The applicable finance-charge rules determine what goes into the calculation; not every settlement cost is automatically included.

Because the APR reflects certain upfront costs as well as interest, it is commonly higher than the note rate. When two otherwise comparable fixed-rate offers have different points or lender charges, the APR can reveal that the lower advertised rate came with higher upfront costs. It does not tell the whole story unless the loan amount, term, rate structure, and other assumptions are comparable.

Where the two numbers appear

On the standard Loan Estimate, the interest rate is listed on page 1 in the Loan Terms table. The APR appears on page 3 in Comparisons. The Closing Disclosure presents the corresponding figures for the final transaction. For an exam question, read the label and location carefully: a quoted rate is not automatically the APR.

A quick comparison example

Suppose two lenders offer the same fixed-rate loan amount and term. Lender A quotes a 6.50% rate with substantial points; Lender B quotes a 6.625% rate with few points. A may have the lower monthly principal-and-interest payment, while B may have the lower APR because it requires less paid upfront. The exact APR must be calculated from the loan's cash flows and finance charges, so the example cannot be resolved by simply adding the fees to the note rate.

Why APR comparisons can mislead

APR is useful, but it depends on assumptions about how long the borrower keeps the loan and how payments are structured. If a borrower sells or refinances early, upfront charges are spread across fewer years than the APR calculation assumes. Compare the cash needed at closing, the monthly payment, the rate type, and likely time in the loan alongside APR.

Use extra care with adjustable-rate mortgages. The APR does not show the maximum rate the contract could reach. A fixed-rate APR and an adjustable-rate APR may rely on different assumptions, so comparing the percentages alone can give a false impression. Review the index, margin, adjustment schedule, caps, and payment examples in the disclosures.

A home equity line of credit also differs from a closed-end mortgage. Its APR treatment may not include the same kinds of fees, so do not compare the two APRs as though they measure identical costs.

How to reason through an exam question

• If asked for the rate used to compute interest on the principal, identify the note interest rate.
• If asked for the broader annualized borrowing-cost measure that includes certain finance charges, identify APR.
• If the question asks which number is usually higher, APR is generally higher when included charges are present; 'always' is too strong.
• If the loan is adjustable rate, do not treat APR as the maximum possible rate or payment.
• If offers differ in term, rate type, or loan structure, do not conclude that the lowest APR must be the best option.

The exam distinction

Remember the relationship, not a memorized spread: the note rate measures interest on principal; APR is the broader measure that includes the note rate plus applicable finance charges, expressed annually. APR supports comparison, but the comparison is strongest when the products and assumptions match.