Loan Products · June 15, 2025
Interest Rate vs. APR: What Is the Actual Difference?
Interest rate and APR are both on your Loan Estimate but they measure different things. Understanding the difference prevents costly comparison mistakes.
Interest rate and APR — two numbers, two different measurements. Confusing them leads to comparing loans incorrectly.
The Interest Rate
The interest rate is the annual cost of borrowing the principal — expressed as a percentage. It determines your monthly payment calculation.
Monthly payment = Loan Amount times (Monthly Rate) divided by (1 minus (1 plus Monthly Rate) to the power of negative n).
Where Monthly Rate = Annual Rate divided by 12, and n = number of payments.
The interest rate alone tells you what your monthly payment will be. It does not tell you the true total cost of the loan.
The Annual Percentage Rate (APR)
APR is a broader measure that includes the interest rate PLUS most loan costs: origination fees, discount points, mortgage broker compensation, and certain third-party fees.
APR is expressed as an annualized rate calculated as if those costs were spread over the loan term.
A loan with a 6.75% rate and $5,000 in fees might have an APR of 7.05%. A loan with a 7.0% rate and zero fees might have an APR of 7.0%.
When to Use Each
For comparing monthly payments: Use the interest rate. For comparing total loan cost: Use the APR. For short-term ownership: APR comparison matters less — you will not pay fees over the full loan term. For long-term ownership: APR is the better comparison metric.
The APR Limitation
APR assumes you keep the loan for its full term. If you sell or refinance in 7 years, you only pay those fees once — the APR overstates the cost relative to the monthly payment impact.
HMS explains both metrics for every loan scenario. Call 309-222-8286.