What is the difference between APR and interest rate?
The interest rate determines your monthly payment. The APR folds certain fees into a single annualised number meant to make offers comparable. APR is useful but routinely misleading, because it assumes you keep the loan for its full term — and most borrowers do not.
Your interest rate is what the lender charges for the money. It is the number that sets your monthly principal and interest payment, and it is the number your amortisation schedule is built from.
The APR takes that rate and adds in certain costs of getting the loan — origination charges, discount points, mortgage insurance, some third-party fees — then re-expresses the whole thing as one annual percentage. The intent is a single number that lets you compare a low-rate-high-fee offer against a high-rate-low-fee one.
Where APR breaks down
APR spreads upfront costs across the entire loan term. A 30-year APR assumes you hold the mortgage for 30 years.
Almost nobody does. The median mortgage is refinanced or paid off well inside a decade. When you leave early, those upfront costs are spread across far fewer months than the APR assumed, so the loan you actually took was more expensive than its APR implied. The lower-APR offer is systematically the wrong choice for a borrower who plans to move in five years.
What to use instead
Compare over your real holding period. The Loan Estimate does this for you in its “In 5 Years” box on page three. If you expect to be gone sooner than that, compare rate and total upfront cost directly and work out which is cheaper across the months you will actually be there.
APR is a useful sanity check on whether an unusually low advertised rate is hiding fees. It is a poor tool for choosing between two serious offers.
Related questions
Why is my APR higher than my interest rate?
Because the APR includes the cost of getting the loan on top of the cost of the money. If they are identical, the loan has essentially no financed closing costs — which is rare enough to be worth a second look at the fee sections.
Can a loan with a higher APR be the better deal?
Frequently. A higher-APR, lower-fee loan usually wins for anyone who moves or refinances within a few years, because there are fewer upfront dollars to recover. The break-even calculation, not the APR, decides it.
Do all lenders calculate APR the same way?
The rules define which fees are included, but there is genuine variation in edge cases. That is one more reason to compare the underlying rate and fee lines rather than trusting a single summary number.